alexa Effects of Antioxidants Vitamin E and C on ErythrocyteFragility, HaemoglobinIndex and Colonic Temperature of Transported Japanese Quails (<em>Coturnixcoturnix japonica</em>)
ISSN: 2157-7579
Journal of Veterinary Science & Technology

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Effects of Antioxidants Vitamin E and C on ErythrocyteFragility, HaemoglobinIndex and Colonic Temperature of Transported Japanese Quails (Coturnixcoturnix japonica)

Ndazo Salka Minka1*and Joseph Olusegun Ayo2

1College of Agriculture and Animal Science, P.M.B. 2134, Department of Animal Health and Husbandry,Division of Agricultural Colleges, Ahmadu Bello University, Mando – Kaduna, Nigeria

2Department of Physiology, Faculty of Veterinary Medicine, Ahmadu Bello University, Zaria, Nigeria

*Corresponding Author:
NS Minka
College of Agriculture and Animal Science
P.M.B. 2134, Department of Animal Health and Husbandry
Division of Agricultural Colleges
Ahmadu Bello University, Mando-Kaduna, Nigeria
Tel: +2348036527538
E-mail: [email protected]

Received date: October 25, 2013; Accepted date: December 18, 2013; Published date: December 22, 2013

Citation: Minka NS, Ayo JO (2013) Effects of Antioxidants Vitamin E and C on ErythrocyteFragility, HaemoglobinIndex and Colonic Temperature of Transported Japanese Quails (Coturnixcoturnix japonica). J Veterinar Sci Technol 4:149. doi:10.4172/2157-7579.1000149

Copyright: © 2013 Minka NS, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Abstract

The present study investigated the effects of antioxidants Vitamin E (VE) and C (ascorbic acid, AA) on erythrocytes osmotic fragility (EOF), haemoglobin index (HI), colonic temperature (CT) and recovery times of transported Japanese quails during the hot-dry conditions. Two hundred male Japanese quails were used. The birds were randomly and equally divided into four groups: VE and AA groups, administered with 0.5 mg/kg and 200 mg/ kg body weight of VE and AA, respectively, control transported group (control group), administered with 0.5 ml of sterile water, and sedentary non-transported group (S). One hour after the administration of the antioxidants, the birds were transported by road for 2 h. The EOF, HI and CT were recorded before transportation, immediately after transportation (0) and on 3rd and 7th day of post-transportation period. The results showed that transportation induced hyperthermia, increased EOF and hypochromic erythrocytes in the quails, the effects of which were mitigated by antioxidants VE and AA. Base-line values for EOF were returned to normal in the control, AA and VE quails on days 7, 3 and 0, respectively post-transportation. The findings showed that recovery time after transportation in quails should be 7 days; but the duration may be reduced to 3 days if treated with AA or eliminated completely if the quails are treated with VE before transportation. The ameliorating effect was more pronounced in quails administered with antioxidant VE. The EOF may be employed as a biomarker and additional diagnostic tool for the assessment of transport-induce oxidative stress in quails.

Keywords

Antioxidant;Ascorbic acid; Colonic temperature; Erythrocyte fragility; Oxidative stress; Quails; Road transportation; Vitamin E

Introduction

The increase in demand for Japanese quails (Coturnixcoturnix japonica) as laboratory and farm birds has necessitated their transportation from one laboratory or farm to the other for the purpose of research, meat and egg production. Transportation of quails by road may compromise their welfare, productivity and the expected experimental results, especially if it is done under adverse environmental conditions and the birds are not given adequate time for the normalization of potentially confounding physiological changes.

Road transportation of animals under high environmental temperature induces physiological and psychological stress which may cause damages to enzymatic and non-enzymatic antioxidant defense systems. The stress stimulates excessive production of stress hormones, acute phase protein and reactive oxygen species (ROS), including superoxide anion radicals, hydroxyl radical, hydrogen peroxide and singlet oxygen [1-6]. The ROS readily oxidise and damage essential biological molecules and increase the susceptibility of the body to diseases. The red blood cells (RBCs) are highly susceptible to oxidative stress as a result of high contents of oxygen and unsaturated fatty acids in their membranes [1,7]. The oxidation of RBCs has been used as a model system for the investigation of oxidative damage of biomembranes [8]. The EOF is a measure of the erythrocyte overall response to osmotic pressure, and is influenced by several extrinsic and intrinsic factors [9]. The EOF has been found to alter in various pathological conditions. The integrity of the RBCs may be determined by measuring the changes in EOF. Measurement of EOF has been applied to the diagnosis of haemolytic diseases, diabetes mellitus and studies of membrane permeability, as an important indicator of haemolysis in blood vessels [7,10].The use of EOF as a biomarker of road transport-induced stress in livestock is a new field of study that may add to the arsenals of tests, currently used in the diagnosis of stress due to road transportation [11-13]. Body temperature measurement is an important method of evaluation of physiological status. It is also an ideal indicator for the assessment of stress and adaptability of livestock, including poultry, to various environmental stress factors [14-16].

Several stress factors have been reported to decrease the level of body antioxidants, vitamin E (VE) and vitamin C, otherwise known as ascorbic acid (AA); resulting in increases in the body requirements in these vitamins [14,17-19]. The administration of the vitamins exerts ameliorating effects which are well manifested; when the body AA and VE are either overwhelmed or exhausted as a result of increased ROS generation by stress factors that overtax the animal control systems [18,20]. Therefore, a decrease in the concentration of antioxidant vitamins causes an increase in lipid peroxidation in the plasma and tissues, leading to damage of cell membranes [21,22].

Previous reports have revealed the beneficial effects of supplementation of VE and AA on birds and animals, subjected to various oxidative stress factors [12,16,18,22].Several studies have evaluated the responses of poultry birds to transportation stress [12,15,23-25]. Inspite of the increasing demand for quails worldwide as laboratory and farm birds, the response and tolerance of the body temperature and erythrocytes of quails to road transportation under unfavorable environmental conditions are poorly studied [2,16,26]. There is paucity of information in the available literature on the ameliorating effects of antioxidant vitamins on EOF and Colonic Temperature (CT), responses of quails to stress due to road transportation under incremental environmental conditions. Furthermore, the duration of recovery time required for the RBCs and CT of quails to return to normal after exposure to transport-induced oxidative stress is yet to be established.

The aims of the present study were to investigate the ameliorating effects of antioxidants VE and AA on EOF, haemoglobin index and CT in quails transported by road during the hot-dry conditions, and determines the duration of post-transportation recovery time.

Materials and Methods

Study area and thermal environmental data

The study was carried out in Livestock Farm of the College of Agriculture and Animal Science, Ahmadu Bello University, Kaduna (11° 10/N, 07° 38/E), located in the NorthernGuinea Savannah zone of Nigeria, in March 2012 during the hot-dry conditions.Ambient temperature (AT) and relative humidity (RH) inside the penwere recorded at 07:00 h, 13:00 h and 18:00 h daily before transportation and thereafter seven consecutive days using a wet- and dry-bulb thermometer (DTH 1, Clarke Int. Epping, Essex, UK), placed near the centre of the pen a little (about 50 cm) above the heads of the birds. The AT and RH were also recorded in the vehicle at 30 min, 1 h and 2 h of the transportation period. Temperature-humidity index (THI) was recorded as a measure of thermal load on the birds during the transportation. THI is determined by equation from the RH and the air temperature and is calculated as described by Steadman [27]. The principle of THI impact on livestock is based on the fact that as the RH at any AT increases, it becomes progressively more difficult for the animal to cool itself.

Colonic temperature

The colonic temperature (CT)was recorded in 50 quails, selected at random, and AT and RH were measured concurrently for three consecutive days before the transportation in order to obtain baseline data. The measurements were also carried out on sedentary and transported birds during the journey at 30 min, 1 h and 2 h of the transportation period, and at 4 h after the transportation. Thereafter, the recordings were done daily for the next 7 days after the transportation. The recording of CT was done by a digital clinical thermometer (Cocet, Shenzhen=Guangdong, China), inserted about 2-3 cm into the cloacae through the anus till an alarm sound was heard, indicating the end of the reading [12,16].

Birds and management

From a total number of 500 quails, raised in deep litter from dayold to maturity in a standard pen, 200 clinically healthy, matured male Japanese quails, aged 8 weeks and weighing between 181-190.0 g, selected by simple randomization, were used. The 200 quails were housed in a floor space area of 145 cm/bird; and provided with feeder and water through spaces of 1.30 cm and 0.6cm, respectively. Supplementary lighting was not provided, but the birds had 9-11 h of natural lighting per day, characteristic of the daytime lighting period in the Northern Guinea Savannah zone of Nigeria during the hotdry season. The nutrient content of the diet fed to the matured birds consisted of, among others, approximately 25% protein, about 12.6 mega joules (MJ) of metabolized energy (ME) per kilogram, 1.0% calcium, minerals and antioxidant vitamins like vitamin E - 4,000 IU, vitamin C - 60 mg, vitamin A - 7812.5 IU, Vitamin B6- 2.2 mg, and selenium - 0.2 mg per kg of feed. Clean drinking water was provided ad libitum.

Experimental protocol and transportation of birds

On transportation day, the birds were randomly assigned into four groups viz: vitamins E (VE), ascorbic acid (AA), control transported and sedentary (not transported) quails, each group consisting of 50 birds. Birds in each group were colour-marked for easy identification. Feed and water were withdrawn from the birds 6 hours before transportation. One hour before loading into a vehicle, 50 quails in VE and AA groups were administered orally and individually with VE and AA at doses of 0.5 mg/kg and 200 mg/kg body weight, respectively, dissolved in 1 ml of sterile water. Control-transported (control) and sedentary (S) quails were given equivalent of sterile water. Thereafter, the birds were loaded in each of the three standard quail crates at a stocking density of about 130 cm2/bird [28]. For transported crates each crate contained 18 birds from VE and AA quails and 14 control quails. This arrangement was provided in order to ensure the same transportation conditions for all the birds. Each crate used for the transportation was then loaded to a Golf-wagon vehicle (VW Automobile Com., Stuttgart, Germany) and transported for 2 h. All the birds were transported at the same time on a typical asphalt single-lane road, from Kaduna (11° 10/N, 07° 38/E) to Birnin Gwari (11° 40/N, 06° 32/E) and from Birnin Gwari back to Kaduna, covering a distance of about 140 km with an average speed of 65 km/h. The sedentary quails were kept in a laboratory under thermoneutral AT (°C) and RH (%) during the 2 h of transportation period. The journey commenced by 11:00 h and was terminated at 13:00 h, similar to normal commercial practice in the study zone. After the transportation, all the birds were unloaded and returned to the same litter pen and offered the same conditions as it was done before transportation. Ten birds selected at random from each group were sacrificed before loading and administration of antioxidants to obtain base-line values of EOF. Immediately after transportation and on the 3rd and 7th day of post-transportation period, 10 birds from each group at each period were sacrificed for the determination of the effects of transportation and antioxidant supplementation on EOF.

Blood sampling and measurement of erythrocyte osmotic fragility

At each period that the quails were sacrificed, about 3-5 ml of blood was collected from each quail into a sterile test tube containing an anticoagulant. The blood samples were quickly kept on ice pack in a flask and taken immediately to the laboratory for the determinations of EOF, PCV, erythrocyte count and haemoglobin concentration. The EOF was determined as described by Beutler [29]. Briefly, 10 μl of blood sample collected from each quail was added to tubes with increasing concentrations of buffered-saline solution (pH 7.4; 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9% of NaCl). The tubes were incubated at room temperature at 26°C for 30 min after mixing the blood gently. Thereafter, the samples were centrifuged at 150×g for 10 min and the supernatant was collected. A spectrophotometer (Shimadzu UV160U UV-VIS, Shimadzu Corp, Kyoto, Japan) was used to determine the optical density of the supernatant at 540 nm. Haemolysis in each tube was expressed as a percentage, taking 100% as the maximum value of the absorbance of the distilled water (0% NaCl concentration).

The EOF curve was obtained by plotting percentage haemolysis against the saline concentrations. Saline concentrations at 20%, 50% and 80% of haemolysis were used to represent the important segments of the curve [30].

From each blood sample, analysis for erythrocyte count, haemoglobin (Hb) concentration and PCV were done as described by Schalmet al. [31]. The following haematimetric (intrinsic) indices were calculated: mean corpuscular volume (MCV: PCV x10/erythrocytes), mean corpuscular haemoglobin concentration (MCHC: Hbx100/ PCV), mean corpuscular haemoglobin (MCH: Hbx10/erythrocytes) and haemoglobin index (HI) (obtained Hbxaverage erythrocytes/ average Hbxobtained erythrocytes) [31,32].

Statistical analysis

Data obtained were subjected to Student’s t-test and were expressed as mean ± standard error of the mean (Mean ± SEM). Repeated measures ANOVA was employed to determine the effects of sampling time, differences between groups and interactions between time x treatments followed by Turkey’s post-hoc comparison test. Values of P<0.05 were considered significant. The EOF results were expressed in simple percentages.

Results

Environmental data

The thermal environmental data recorded before, during and after transportation periods showed that the AT, RH and THI recorded inside the pen before and after transportation had mean values of 37.0 ± 0.5°C, 72.7 ± 5.0% and 32 ± 3.0, respectively. During the transportation period, the thermal environmental conditions, recorded inside the vehicle fluctuated between 29.5 and 37.6°C for AT, from 56.6% to 74.7% for RH and 39 to 42 for THI. Overall, the mean values for AT, RH and THI, recorded during the transportation period were 32.5 ± 1.4°C, 66.9 ± 5.7%, and 40.4 ± 6.7, respectively.

Colonic temperature

The CT of the quails recorded before transportation had mean, maximum and minimum values of 40.4 ± 0.2°C,41.7°C and 39.0°C, respectively. The CT value recorded at 18:00 h was significantly (P<0.05) higher than that recorded at either 07:00 h or 14:00 h.The birds also exhibited individual variation in CT. The mean CT recorded in all the groups of the quails during transportation period are shown in Table 1.The CT values recorded in VE and AA quails at 30 min, 1 h and 2 h of the transportation period were significantly lower (P<0.05) than the corresponding values recorded in control quails. The mean CT value of 40.7 ± 0.2°C recorded in VE quails was significantly lower (P<0.001) than the corresponding values of 41.3 ± 0.6°C, 42.5 ± 0.4°C and40.8 ± 0.4°C, recorded in AA, control and sedentary quails, respectively during the transportation period. Furthermore, the differential value (ΔCT), which is a magnitude of change in thermoregulatory response to thermal stress, of -0.1°C, recorded in VE quails was significantly lower (P<0.001) than the corresponding ΔCT values of 0.8°C, 1.8°C and 0.0°C recorded in AA, control and sedentary quails, respectively immediately after the transportation period (Table 1). Four hours after transportation and feeding, the CT of sedentary, VE and AA quails returned to base-line values; while the CT obtained in control quails were significantly higher (P<0.05) than the base-line values. However a day after the transportation, the CT of the control-transported quails, although still higher, also returned to base-line (Table 2).

Group of quails
Journey time VE  (n=40) AA   (n=40) Control (n=40) Sedentary (n=40)
Pre-transportationx 40.8 ± 0.5 40.4 ± 0.2 40.6 ± 0.2 40.8 ± 0.1
30 min 41.0 ± 0.3 42.0 ± 0.3 42.6 ± 0.6 40.7 ± 0.2
1 h 40.5 ± 0.2 41.7 ± 0.3 42.5 ± 0.8 40.8 ± 0.3
2 h 40.6 ± 0.1 41.2 ± 0.5 42.4 ± 0.2 41.0 ± 0.2
Mean  ±  SEM 40.7 ± 0.2a 41.3 ± 0.6b 42.5 ± 0.4c 40.8 ± 0.4a
?CT -0.1 0.8 1.8 0.0

Table 1: Colonic temperature (°C) responses of quails to 2-h transportation and administration of vitamin E and ascorbic acid.

Group of quails
Recovery time VE  (n=10) AA   (n=10) Control (n=10) Sedentary (n=10)
1 h after journey 41.6 ± 0.2 41.8 ± 0.4 42.6 ± 0.6 41.4 ± 0.4
2 h      ,, 41.2 ± 0.3 41.0 ± 0.7 42.2 ± 0.5 41.4 ± 0.1
3 h      ,, 40.4 ± 0.6 41.6 ± 0.2 41.4 ± 0.6 40.4 ± 0.6
4 h      ,, 40.6 ± 0.2 40.6 ± 0.2 42.0 ± 0.4 40.8 ± 0.1
Mean  ±  SEM 41.0 ± 0.2a 41.3 ± 0.5a 42.1 ± 0.7b 41.0 ± 0.5a
Day 1 after journey 40.6 ± 0.1 40.4 ± 0.1 41.4 ± 0.5 40.4 ± 0.1
Day 3        ,, 40.5 ± 0.2 40.7 ± 0.1 40.7 ± 0.7 40.3 ± 0.2
Day 7        ,, 40.7 ± 0.6 40.3 ± 0.4 40.4 ± 0.6 40.4 ± 0.5
Mean  ±  SEM 40.6 ± 0.2ns 40.5 ± 0.5ns 40.7 ± 0.5ns 40.4 ± 0.5ns

Table 2: Colonic temperature (°C) responses of transported quails pretreated with antioxidants vitamin E and ascorbic acid during the first 4 h and 7 days of posttransportation recovery periods.

Erythrocyte count, haemoglobin and intrinsic parameters

In VE and AA quails, transportation increased the erythrocytes count, Hb concentration, PCV and MCHC and decreased intrinsic parameters of MCV, MCH and HI.However, the changes in these values were not significantly (P>0.05) different from the pre-transportation range values of 3,0-3.6×106/ul, 16.8-18.2g/l, 38.9-40.5%, 32.2-33.9g/ dl, 130-136fl, 40.5-44.5pg and 0.94-0.97recorded for erythrocytes, Hb, PCV, MCHC, MCV, MCH and HI, respectively. In controlquails the values recorded post-transportation were significantly higher (P<0.05) than the pre-transportation and the corresponding values recorded in VE and AA quails. The Hb index recorded in control quails posttransportation had the value of 0.79 which was maintained up to the 7th day of recovery period, while in VE, AA, and sedentary quails the index was between 0.92-0.97.

Erythrocyte osmotic fragility

Figure 1 shows the pre-transportation EOF of the quails.The median (50%), minimum (20%) and maximum (80%) corpuscular fragility occurred at 0.4, 0.45 and 0.32% NaCl concentration, respectively; and the difference in the values was not significant (P>0.05) between the groups (Figure 1). The EOF recorded immediately after transportation and on the 3rd and 7th day post-transportation periods are shown in Figures 2, 3 and 4. The mean, minimum and maximum corpuscular fragility values recorded in VE quails immediately after transportation were 0.42, 0.45 and 0.38% NaCl concentration, respectively, and the values though higherthan pre-transportation and sedentary values, were not significantly (P>0.05) different. Similarly, 3 and 7 days after the transportation, the EOF values in VE quails were not statistically different (P>0.05) from pre-transportation values. However, the values were lower (P<0.001) than the corresponding values obtained in AA and control quails immediately, and 3 and 7 days after the transportation. The EOF recorded in AA quails immediately after transportation was lower than those recorded in the controlquails. After the transportation, values returned to base-line in AA on day 3; but in control quails, base-line values were attained only on day 7. Overall, the percentage erythrocytes that underwent 50% and maximum (80%) haemolysis in the control quails at various NaCl concentrations immediately and 3 days after transportation were higher (P<0.05) than the pre-transportation values, and the corresponding values obtained in the erythrocytes of VE, AA and sedentary quails.

veterinary-science-technology-Erythrocyte-osmotic-fragility

Figure 1: Erythrocyte osmotic fragility of quails before transportation by road.

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Figure 2: Erythrocyte osmotic fragility of quails administered with vitamin E and ascorbic acid immediately after road transportation.

veterinary-science-technology-antioxidants-vitamin

Figure 3: Effects of antioxidants vitamin E and ascorbic acid on erythrocyte osmotic fragility of quails on day 3 of post-transportation recovery period.

veterinary-science-technology-erythrocyte-osmotic-fragility

Figure 4: Effects of antioxidants vitamin E and ascorbic acid on erythrocyte osmotic fragility of quails on day 7 of post-transportation recovery period.

Discussion

Road transportation represents a critical phase in animal production and utilization and it is considered one of the main causes of stress. Such stress factors encountered during the transportation include handling and crating, noise and vibrations from the vehicle; emotional factors, such as unfamiliar transport environment; and climatic factors, such as high AT, RH and thermal load.During the study, the AT and RH recorded in the afternoon hours before transportation and inside the vehicle during the 2 h transportation period were above the upper critical values of 24°C and 64.3%, respectively for quails [14,33]. Similarly, the THI was higher during the transportation and the afternoon hours, which suggested higher heat load on the birds. At this period, heat stress was apparent and posed a significant threat to the birds and, consequently, to their welfare. Thus, the high thermal load experienced by the birds compromised their thermoregulation and, consequently, cooling. The present result supports earlier findings that the hot-dry season in the study zone is thermally stressful to birds; and that it is characterised by high AT and high RH, especially during the peak afternoon hours of the day [12,24]. Poultry raised or transported under such incremental environmental conditions have been reported to have high morbidity, mortality and low productivity [12,14,24,33].

The CT recorded before transportation showed individual variation among the quails, and exhibited distinct diurnal fluctuations. Such fluctuations are normal, and they are driven by a biological clock in the brain [34]. The variations observed in CT were similar to the results obtained in pullets by Sinkalu and Ayo [35], who showed that CT fluctuates with AT and hour of the day. The mean CT value of 40.4 ± 0.2°C recorded was within the recommended normal rage values of 40 - 41.5°C for quails [36]. The increase above normal value in CT, recorded during the afternoon and evening periods indicates mild stress as a response of the body to accumulated heat load. Similar response of the body to heat load was reported in quails subjected to heat stress [14,33,36]. Although the increase in CT values recorded in sedentary quails, kept in cages under thermo-neutral AT and RH for two hours, was lower than that recorded in transported VE, AA and control quails, the values were above normal reference values. This finding suggested that crating of the quails even under thermo-neutral conditions may constitute a stress factor, and may induce acute hyperthermia, in quails raised in deep litter. Indeed, handling and crating of birds for whatever reason have been shown to constitute a major stressor during management of poultry [12,23,24].

The significant increase in CT recorded in the control quails during the transportation period demonstrated the adverse effects of 2-h road transportation on the CT of the quails. The present result disagreed with that obtained by Tekelioglu et al. [2]; although the CT was not measured in the study, the result showed that 2 h of simulated transportation did not induce any stress in the quails. The difference in the finding of the present study and that of Tekelioglu et al. [2] may be due to the fact that the study was a simulation and the quails used were transported under thermoneutral AT of 18°C.Such AT is not attainable under normal (natural) transportation conditions in tropical. However, the result of the present study agreed with that of González et al. [26], who demonstrated that road transportation of quails for 95 min under high AT of 45°C was very stressful. In general, poultry face difficulties in maintaining body temperature, especially under high ambient temperature, apparently due to lack of sweat glands and relatively high body temperature [37].

The CT values obtained in VE and AA quails after the transportation demonstrated the ameliorating effects of the antioxidants on CT of quails, subjected to road transportation stress under high AT, RH and THI. The antioxidant effect was more pronounced in VE quails as compared to AA quails, apparently because VE is a well-known lipophilic free-radical scavenger, mainly localised in phospholipid bilayer membranes [1]. This property of VE may contribute to its high efficacy in reducing CT of the quails than AA, which is solely watersoluble and acts primarily in cellular fluid. Such high level efficacy of VE was not observed in pullets transported for 6 hours in the zone [12]. The reason for this difference may be due to variation in species and transportation duration. This requires further investigation.

The differential data, ΔCT, recorded in VE quails after transportation was not significantly different from pre-transportation data. The finding indicated that no significant adverse effects of the transportation and thermal stress were exerted on the CT of VE quails. Thus, VE mitigated the negative effects of road transportation- and thermal load-induced stress on CT of the quails. Similar result was also obtained in AA quails; although the magnitude of change in ΔCT was higher (P<0.05) than that obtained in VE quails, but it was significantly lower (P<0.001) than the ΔCT obtained in control quails. Both VE and AA are potent antioxidants that neutralise ROS generated during stress conditions, which were responsible for a series of pathological changes. Vitamins E and AA directly inhibit prostaglandin output, especially of PGE series, and cytokines, especially IL- 1 and IL- 6, whose turn-over increases during stress. The cytokines are responsible for inflammation, a shift in thermoregulatory set-point and elevated body temperature [38,39]. Therefore, by affecting the thermoregulatory centre, the antioxidant vitamins apparently exerted ameliorating effects on the elevated CT in the transported quails. Furthermore, the fact that these vitamins are known to inhibit the release of cortisol [40,42], the chief fear hormone, may be involved in the mechanism of regulation of the body responses, aimed at maintaining homeostasis. In addition, VE and AA have been reported to reduce heat load in birds [12,14,16,21,43]. Thus, the administration of the antioxidants pre-transportation reduced the adverse effects of incremental THI or heat load experienced by the birds inside the vehicle during the transportation period. Such high THI has been reported to induce hyperthermia and increase morbidity and mortality in transported broilers [44,45], pullets [12,15] and goats [25] subjected to road transportation under high environmental conditions.

The erythrocyte count and Hb concentrations, and the mean, minimum and maximum corpuscular fragility values recorded in quails before the transportation period were similar to the values recorded in healthy quails [30]. The AT and RH values recorded during the afternoon hours were considerably higher than the thermoneutral values. Such high AT and RH values did not induce significant adverse effects on the EOF. Similarly, the high CT values recorded in the afternoon hours in the quails did not have any significant effect on the erythrocytes. The result suggests that the increase in the AT, RH and CT values recorded before the transportation were not sufficient to increase significantly the damage to the erythrocyte membranes, apparently due to the short duration of exposure of the quails to the thermal environmental factors and, especially, their ability to adapt to such increment in AT and RH.

The increase in erythrocyte count recorded after the transportation suggested that the transportation induced excitement, resulting in splenic contraction and the release of erythrocytes into the circulation. This mechanism is induced by the action of catecholamines on adrenergic receptors, located in the splenic capsule and partly attributed to a reduction in the plasma volume [8]. The higher (P<0.05) Hb concentration and EOF values obtained immediately, and 3and 7 days after transportation in the control quails as compared to VE and AA quails, indicates erythrocyte destruction due to the adverse effects of road transportation stress factors.Such stress factors were mainly handling, crating, vehicle motion and vibration, noise from the engine or moving vehicle, incremental micro-environmental conditions, travel sickness and novelty to the environment [12,13,24]. The stress factors in a complex way overtax the animal control systems and induce oxidative stress [1,12].

The mechanism by which road transportation induced the increase in EOF in the quails may be multi-factorial.Firstly, the process of handling and crating and increase in muscular activities of the birds in the crates, as they attempt to escape or maintain balance, as well as the effect of vibration from the vehicle may result in mechanical trauma of the erythrocytes.Thus, the erythrocytes may be compressed against the blood capillaries within the contracting muscle leading to deformity and ultimate haemolysis [25]. Secondly, the elevated body temperature, due to thermal-load-induced stress experienced during the transportation, apparently “melt” the fatty acid tails of the phospholipid bilayer of the erythrocytes. The erythrocytes therefore, become more fluid and allow more movement and permeability of the cells, thereby damaging them. Furthermore, high temperatures recorded during transportation may cause proteins of the erythrocytes membrane to denature, which may lead to membrane disintegration and haemolysis [7,10,25]. Thirdly, transport-induced oxidative stress on erythrocytes due to the adverse effect of toxic ROS, presumably generated during the transportation, may also contribute to the deterioration of erythrocyte properties; leading to increase in haemolysis.This is true because the erythrocytes are susceptible to oxidative stress as a result of high contents of unsaturated fatty acids in their membranes [1]. The ROS may damage cell membranes of the erythrocytes in the transported quails by inducing lipid peroxidation of polyunsaturated fatty acids in their cell membranes. Furthermore, other factors, which were not measured in the present study, such as dehydration, haemoconcentration, depletion of VE and AA, changes in blood pH and erythrocyte morphology, and increments in intracellular Ca2+ due to β-adrenergic stimulation, apparently as a result of acute exposure to transport-induce stress may cause erythrocyte deformability, and increase EOF and intravascular haemolysis [46].

The higher EOF, maintained 7 days after transportation in control quails, indicated the long-lasting adverse effects of transport-induced stress on the erythrocytes of the quails and that transportation may have profound effects on quails in ways that may not be immediately obvious. Thus, the amount of recovery time for quails that were transported for 2 h should be above 7 days before exploiting them further for meat, or research study. The duration should be considered as an important factor because oxidative stress does not exhibit immediate symptoms. Rather, it promotes the insurgence of serious pathologies as a result of degenerative damages of the cellular structure [5], which may adversely affect meat and egg quality or compromise research results.

The insignificant decrease in EOF values from the pretransportation values, recorded in VE quails immediately and 3 days after the transportation suggested that VE attenuated the damage on erythrocytes caused by the concomitant effects of heat and road transportation stresses. The stresses have been demonstrated to generate ROS, which induce lipid peroxidation of polyunsaturated fatty acids in membranes, and, consequently, destruction of cells. The mechanism by which VE attenuated EOF may be through decreasing lipid peroxidation and increasing intracellular antioxidant levels. This is particularly so because poultry cannot synthesize vitamin E. Therefore, the requirements of birds in the vitamin must be met from dietary sources. Thus, its supplementation during stressful conditions is of paramount importance. Vitamin E is known to be the most abundant fat-soluble and most efficient chain-breaking antioxidant available in the body, and is the primary defender against lipid peroxidation, maintaining cellular metabolic functions [22,47]. The lower EOF recorded in VE quails post-transportation as compared to AA and control quails further demonstrated the superior effect of VE over AA in combating transport-induced stress in quails.

The result of EOF recorded in AA quails immediately after transportation showed an increase above pre-transportation values, although the EOF value was lower than that recorded in control quails. The result also indicated the ameliorating effect of AA against transport-induced stress in erythrocytes of the quails. It is reasonable to assume that the administration of AA has reduced the intensity of oxidant stress, experienced by the quails during the transportation; apparently, by protecting both cytosolic and membrane components of erythrocytes from oxidant damage. In the cytosol, ascorbate acts as a primary antioxidant to scavenge ROS [48] that is presumably generated due to transportation-induced stress. For cellular membranes, AA may play an indirect antioxidant role in reducing the α-tocopheroxyl radical to α-tocopherol [8,42], and probably recycles α-tocopherol in erythrocyte membranes and intact erythrocytes [42]. The erythrocyte results indicate that AA may interact directly with the plasma membrane as an antioxidant and also donate electrons to a trans-plasma membrane electron transfer activity in the erythrocytes [48]. On the overall, the result of the present study showed that road transportation of quails induced oxidative stress in the erythrocytes, resulting in increased osmotic fragility, which was ameliorated by VE and AA administration. Thus, EOF may be implored as a biomarker of oxidative and road transport-induced stresses in quails. The EOF may be added to the existing diagnostic tools, often used in the assessment of transport-induced stress.

The decrease in MCV and MCH recorded in the control quails below the normal values of 132.7 fland 44.0, respectively, established for quails [49], and pre- transportation values showed that stress due to road transportation decreased the volume and average Hb content in individual erythrocytes. The decrease in MCV indicates that older, stable and healthier erythrocytes were destroyed [8,25], apparently due to the deleterious effects of the transport-induced stress. Higher MCV values are associated with larger, healthier and stable erythrocytes [50]. The results obtained in VE and AA quails, although at peak concentration levels, further demonstrated the protective role of the antioxidants, VE and AA on erythrocyte membranes. Similar results were reported in humans subjected to exhaustive exercises [8], and in goats pre-treated with AA and transported by road [25]. The significant increase in the value of MCHC in control quails after transportation confirmed the increase in Hb concentration, recorded in the controlquails.

The Hb index obtained in the control quails indicated that the transportation resulted in hypochromic erythrocytes; that is lower concentration of Hb in the individual erythrocytes. The result further demonstrated the low Hb concentration in the erythrocytes that were not fully haemolysed. However, the administration of antioxidants, VE and AA maintained the erythrocytes in a normochromic status, which suggested less cell damage. Smirnov et al. [32] and Minka and Ayo [25] showed that erythrocytes are normal (normochromic) if the Hb index is equal to one; hypochromic if less than one, which indicates a lower concentration of Hb in the erythrocytes; and hyperchromic, if higher than one.

In general, VE and AA have been shown to increase the activities of antioxidant enzymes, including glutathione peroxidase, SOD and CAT, towards the normal level, and decrease the levels of MDA, and the activities of serum biochemical activities [18,39,47]. Thus, the administration of VE and AA did not only ameliorate oxidative stress, but apparently, also enhanced the antioxidant status of the birds. Similar effects of VE and AA on the erythrocytes have been reported in humans, suffering from different diseases or subjected to strenuous exercise [8,39,41], and in livestock, including poultry, subjected to diverse pharmacological and stressful conditions [12,14,15,19,46]. Of recent, the ameliorating effect of AA on the erythrocytes was shown in transported pigs [11,13] andgoats [24]. The result obtained in the present study on VE and AA clearly indicated the role of the antioxidant vitamins in maintaining erythrocyte membrane integrity and, consequently, decreasing the degree of haemolysis in transported quails. It is recommended that the antioxidants, VE and AA be administered prior to transportation for better management of road transportation stress in quail birds, especially during the hot-dry conditions.

Conclusions

Road transportation of quailsduring the hot-dry conditions induced hyperthermia, increased oxidative stress and EOF, which were attenuated by pre-treatment with antioxidants, VE and AA. The findings showed that recovery time duration after transportation in quails should be 7 days; but the duration may be eliminated if the quails are treated with VE or reduced to 3 days if treated with AA, which suggested that the amelioration of road transport-induced stress was more effective in quails administered with VE as compared to those treated with AA.

Ethical Standard

All birds that served as subjects in this study were humanely cared for in accordance with the international guidelines governing poultry welfare during transportation by road [51,52] and the research protocol was approved by the Departmental Research Committee on Animal Health and Husbandry, College of Agriculture and Animal Science, Division of Agricultural Colleges, Ahmadu Bello University, Mando- Kaduna, Nigeria.

Acknowledgements

The authors are grateful to the Laboratory staff of the College of Agriculture and Animal Science, Kaduna, and Mr E. N. Nwosu of the Department of Veterinary Physiology and Pharmacology, Ahmadu Bello University, Zaria, Nigeria for their technical assistance.

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