Fertility of sows mated on different days of the week [pigs]
1990
Love, R.J. (Sydney Univ., Camden (Australia). Dept. of Animal Health) | Wilson, M.R. (Guelph Univ., Guelph (Canada). Dept. of Population Medicine)
Analysis of data from a 2800-sow intensive piggery in both 1983 and 1984 showed that sows mated early in the week achieved a significantly higher farrowing rate than sows mated late in the week. During the seasonal (summer to autumn) infertility period, Wednesday matings resulted in a poor farrowing rate whereas for the rest of the year farrowing rates following Wednesday matings were similar to those for Sunday, Monday and Tuesday matings. Consistent results were obtained for data from both years. It is proposed that the stress of regrouping unmated sows on Wednesday to accommodate newly weaned sows is responsible for this decrease in fertility. Detailed analysis of farrowing rates on a day of mating basis can identify a problem which is otherwise masked by weekly data.
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