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| TOURNADRE, H.; PELLICER, M.; BOCQUIER, F.. |
| 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<0.05) and with a longer time period between drying-off and mating: from 29% to 84% (p<0.001) for 22 and 86 days elapsed,... |
| Tipo: Journal paper |
Palavras-chave: Sheep and goats. |
| Ano: 2009 |
URL: http://orgprints.org/15453/1/14%2DTournadre.pdf |
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| MATON, C.; MONTAGNAC, D.; VIUDES, G.; BOUCQUET, P.; BOCQUIER, F.. |
| Technical constraints of livestock production in organic farming systems are numerous and require more attention than in conventional systems. The implementation of individual electronic identification that is planned in Europe offers the possibility of developing automated devices that may be well adapted to the practices of organic breeders. We developed an automated mounting detector, carried by a male, which makes it possible to detect any female in oestrus. Hence, this device is the unique solution for inseminating females when they are fertile, thus ensuring links with selection programmes. The second device developed is a dynamic sorting door based on respect for animal behaviour, preventing stress by allowing animals not to be unnecessarily... |
| Tipo: Journal paper |
Palavras-chave: Animal husbandry. |
| Ano: 2009 |
URL: http://orgprints.org/15466/1/11%2DMaton.pdf |
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