THYMUS VULGARIS L., GLYCYRRHIZA GLABRA, AND COMBO ENZYME IN CORN OR BARLEY-BASAL DIETS IN BROILER CHICKENS
Mostafa Rezaei1, Majid Kalantar2*, Javad Nasr1
|Corresponding Author: Majid Kalantar, E-mail: [email protected]|
|Received: 4 May-2014 Accepted: 4 June-2014|
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This study was carried out to determine the effect of supplementation of Thymus vulgaris L. or Glycyrrhiza glabra in corn-soybean meal diets and the inclusion of exogenous enzyme of Combo® in barley-soybean meal diets beside of mentioned medicinal plants on carcass characteristics, some blood parameters, and broiler chicken performance. A total of 270 unsexed 1-d-old broiler chickens (Ross 308) were randomly allocated to 6 treatments with 3 replications of 15 birds. Dietary experiments were including of control (T1), the inclusion of T. vulgaris, G. glabra, their mixture (equal amount), and enzyme (Combo®) supplementation (T2, T3, T4, and T5, respectively) based on corn-soybean meal diets or enzyme supplementation plus equal amount of tested medicinal plants (T6) based on barley-soybean meal diets. Medicinal plants and enzyme supplementation were included in diets at level 0.5% and 0.2% of diets, respectively. The highest feed intake was found by T5 and T6 groups, while the highest weight gain was related to T2, T5, and T6 (P<0.05). Also, the lowest FCR was achieved by T6 (P<0.05). Diets contained medicinal plants (T2, T3, and T4) led to significantly decreases in carcass, breast, and liver weights (P<0.05). All diets led to significant decreases in abdominal fat, pancreas, and bursa weights as well as blood cholesterol content rather control (P<0.05). The lowest content of glucose was obtained by T4 (P<0.05). Diets contained G. glabra caused significantly increases in total protein content of blood (P<0.05). These results elucidate that effect of tested medicinal plants is depended on basal diets. The use of T. vulgaris L. or G. glabra together with enzyme supplementation in barley-based diets show better mien rather corn-basal diets without enzyme.