alexa The Effect of Short-Term Nutritional Supplementation and Body Condition on the Pituitary and Ovarian Responses of Anoestrous Ewes to the “Ram Effect”
ISSN: 2157-7579

Journal of Veterinary Science & Technology
Open Access

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Research Article

The Effect of Short-Term Nutritional Supplementation and Body Condition on the Pituitary and Ovarian Responses of Anoestrous Ewes to the “Ram Effect”

Johnson L1, Fabre Nys C1, Chanvallon A1,2, François D3, Fassier T4, Menassol JB1, BrownHM1, Lardic L1 and Scaramuzzi RJ1,5*
1UMR Physiologie de la Reproduction et des Comportements, UMR 6175 INRA-CNRS-Université de Tours-Haras Nationaux, 37380 Nouzilly, France
2Centre Interrégional d’Information et de Recherche en Production Ovine, Site expérimental du Mourier, 87800 St Priest Ligoure, France
3INRA UR 631 SAGA, Chemin de Borde-Rouge Auzeville Chemin de Borde-Rouge Auzeville, BP 52627, 31326 Castanet Tolosan, France
4INRA UE 332 Bourges, Domaine de la Sapinière, 18390 Osmoy, France
5Department of Veterinary Basic Sciences, Royal Veterinary College, Hawks head Lane South Mimms, Hertfordshire AL9 7TA, UK
Corresponding Author : Dr. Scaramuzzi RJ
Emeritus Professor
Department of Veterinary Basic Sciences
Royal Veterinary College Hawkshead Lane South Mimms
Hertfordshire AL9 7TA UK
E-mail: [email protected]
Received August 26, 2011; Accepted October 19, 2011; Published October 23, 2011
Citation: Johnson L, Fabre Nys C, Chanvallon A, François D, Fassier T, et al. (2011) Condition on the Pituitary and Ovarian Responses of Anoestrous Ewes to the "Ram Effect". J Veterinar Sci Technol S2:001. doi:10.4172/2157-7579.S2-001
Copyright: © 2011 Johnson L, 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.
 

Abstract

In sheep production, the “ram effect� is a technique for inducing fertility in seasonal anoestrus and “flushing� a technique to increase litter size. Often used individually, we wanted to know if they could be used together to improve reproductive performance of ewes bred during the anoestrous season. Two experiments were conducted; the first with �le-de-France ewes (N=30) comprised a control and a group fed a nutritional supplement and the second with Romane ewes (N=60) replicated these treatments at two levels of body condition. The ewes were stimulated with the “ram effect� and the following responses measured (i) blood concentrations of LH, FSH, oestradiol, progesterone, glucose and insulin (ii) oestrus and (iii) ovarian cyclicity. Supplementation increased blood glucose and insulin in experiment 1 but not in experiment 2 but it had no effect on FSH; it reduced oestradiol in xperiment 2 but not in experiment 1. Higher body condition was associated with higher blood glucose and insulin but not FSH or oestradiol. In addition, higher body condition was associated with a greater proportion of ewes responding to the “ram effect� and greater short-term responses for LH and oestradiol; supplementation had no effect on these responses. In experiment 1 but not experiment 2, supplementation was associated with a higher proportion of ewes in oestrus. The results demonstrate that there are close relationships among the oncentrations of LH and estradiol, the LH surge and the ovarian cyclicity in response to the “ram effect�. These data show an effect of ody condition on “ram effect� that can modify cyclicity and suggest an effect of short-term nutritional upplementation on oestrus. Furthermore these data also suggest that the functional capacity of follicles at the time of the ram effect� is an important determinant of outcome.

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