Controlling reproduction in organic sheep breeding: the influence of breeding factors on the effectiveness of the ram effect
| Autor: | TOURNADRE, H., PELLICER, M., BOCQUIER, F. |
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| Přispěvatelé: | Unité de Recherches sur les Herbivores (URH), Institut National de la Recherche Agronomique (INRA), Physiologie de la reproduction et des comportements [Nouzilly] (PRC), Institut National de la Recherche Agronomique (INRA)-Institut Français du Cheval et de l'Equitation [Saumur]-Université de Tours (UT)-Centre National de la Recherche Scientifique (CNRS), Elevage des ruminants en régions chaudes (UMR ERRC), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA), Institut National de la Recherche Agronomique (INRA)-Institut Français du Cheval et de l'Equitation [Saumur]-Université de Tours-Centre National de la Recherche Scientifique (CNRS), BELLON, S., DIOLEZ, A., HUYGHE, C., PENVERN, S., SAVINI, I. |
| Jazyk: | francouzština |
| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | Innovations Agronomiques Innovations Agronomiques, INRAE, 2009, 4, pp.85-90 |
| ISSN: | 1958-5853 |
| Popis: | Colloque Dinabio mai 2008 à Montpellier; National audience; The ram effect, which is a natural method for the control of reproduction in sheep, is an alternative to hormone treatments that are banned on organic farms. The ram effect induces a combination of ovulation and oestrus in ewes that is acyclic and conducive to artificial insemination. The proportion of acyclic females with induced ovulation and their subsequent fertility at the first oestrus is variable. The control of some breeding factors that have been studied here may help to reduce this variability. The proportion of ewes induced to ovulate by rams increased as the season advanced (54% in April vs. 84% at the end of May, p |
| Databáze: | OpenAIRE |
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