Graduate Thesis Or Dissertation
 

Reproductive and litter performance of sows mated during lactation

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  • An experiment was conducted with 51 control and 51 experimental confinement- managed purebred Yorkshire sows of various parities to (1) determine whether confinement-managed sows during lactation would exhibit estrus, mate, and conceive as a consequence of a daily regimen of a short period of separation from their litters, mixing sows together during the separation period, and exposure to a boar during this period; (2) assess effects of the experimental regimen on the preweaning and early postweaning performance of litters currently nursing; and (3) assess effects of the experimental regimen on size and performance to weaning of litters farrowed as a consequence of mating during lactation. Separation of dams from their litters for six hours a day for a minimum of seven and a maximum of 20 days during lactation resulted in occurrence of estrus and mating by 80% of sows during lactation with no adverse effect on preweaning performance of current and subsequent litters; 90% of the control sows mated during a 20 day period following weaning. Postweaning average daily gain and feed intake for the current litters of the experimental group sows during each of the three weeks of measurement was greater than for the litters from the control sows; these differences were statistically significant (P<.01) in the third week. Possible advantages of using the experimental regimen rather than mating after weaning on 42 days age of litter include: (1) shortening the interval between farrowing and mating comparable to that achieved by weaning at three weeks but without employing early weaning, (2) less intensity and shorter duration of impaired postweaning performance, (3) saving of gestation feed by breeding three weeks earlier, (4) an increase of about 18% in pigs produced/sow/year, (5) a more flexible use at weaning of the already-bred sows for rearing young litters of foster pigs without causing delay in production of next litter.
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