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A study of ovulation and inseminations times in sow herds and their consequences for litter size


, : A study of ovulation and inseminations times in sow herds and their consequences for litter size. Journees de la Recherche Porcine en France 29: 103-108

222 sows in 5 herds were inseminated so that group farrowing occurred every 3 weeks. Oestrus was detected using a boar, and sows were inseminated at least twice during an oestrus with commercially available semen. Ovulation time was estimated from plasma progesterone concentration. 92% of sows exhibited oestrus during 7-day periods, the CR was 88%, and litter size at birth averaged 12.4+or-0.2.

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