Maîtriser la reproduction en élevage ovin biologique : influence de facteurs d’élevage sur l’efficacité de l’effet bélier
| Autor: | Tournadre, Hervé, Pellicer Rubio, Maria, Bocquier, Francois |
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| Jazyk: | francouzština |
| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | Innovations Agronomiques (4), 85-90. (2009) |
| Popis: | Une des façons d’améliorer l’efficacité de l’effet bélier est de se placer dans de bonnes conditions d’élevage. Ainsi, la proportion de brebis dont l’ovulation est induite augmente lorsque la date d’introduction des mâles est plus tardive (55% en avril vs 81% fin mai, p 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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