The influence of the weaning-to-breeding interval on ovulation rate in parity-two sows
نویسنده
چکیده
Results: Average ovulation rate for all sows in the study was 14.58 +/0.32 ova and for the parity-two sows was 14.0 +/0.23 ova. The mean weaning-to-breeding interval for the parity-two sows was 5.87 +/0.14 days. Ovulation rate in the parity-two sows increased by 0.25 +/0.09 ova as the number of piglets weaned in the sow’s previous parity increased by one piglet (P <.05). The parity-two sow’s population line and the season she was weaned were also associated with ovulation rate (P <.001). Compared with sows with weaning-to-breeding intervals of 4-5 days, ovulation rate decreased by 1.04 +/0.39 ova for parity-two sows with weaning-to-breeding intervals of 6 days, increased by 3.08 +/0.96 for sows returning to estrus 9 days postweaning, and decreased by 2.62 +/1.13 for sows returning 10-12 days postweaning (P < .05).
منابع مشابه
Administration of p.g. 600 to sows at weaning and the time of ovulation as determined by transrectal ultrasound.
This study determined whether the interval from estrus to ovulation was altered by giving P.G. 600 to sows at weaning. Mixed-parity sows received P.G. 600 i.m. (n = 72) or no treatment (n = 65) at weaning (d 0). Beginning on d 0, sows were observed for estrus twice daily. At the onset of estrus and thereafter, ultrasound was performed twice daily to determine the average size of the largest fol...
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