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The mean number of piglets born was maximum for litters conceived in August, September, November and minimum for those conceived in December and January. On an average a difference of one piglet was noticed between the two extreme months, i.e., November, January. Piglets were all issued from dams in fourth gestation (N = 10 981), where prolificacy reaches a plateau and varies little. Variation in the ovulation rate during the year in sows slaughtered at 30 days post coitum in third and fourth gestation (N = 415) was parallel to that of the number of embryos and that of the litter size. The maximum corresponded to fertilization in August, September, October, November and the minimum to fertilization in December, January and February. On an average, a difference of two ovulations was noticed between FebruaryOctober.

Seasonal variation in the litter size in relation with variations in the ovulation rate and the embryo mortality in the sow