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Reproductive traits in primi parous sows in relation to feeding level



Reproductive traits in primi parous sows in relation to feeding level



Netherlands Journal of Agricultural Science 29(4): 285-296



To measure the effect of feeding level and induction of estrus with 400 IU of pregnant mare serum and 200 IU of human chorion gonadotrophin, some reproductive and liveweight traits of 113 primiparous Dutch Landrace sows were analyzed. Feeding levels during the interval from weaning to estrus were 4 kg and 2.5 kg/sow per day. The number of sows in estrus within 21 days of weaning was 69 (61%). Within 7 days of induction of estrus on day 21, 41 sows were in estrus (36%). On day 21, 37 (65%) of the better fed sows were in estrus and 32 (53%) of the poorer fed group. The interval from weaning to spontaneous estrus was 9.1 and 8.2 days, respectively, and ovulation rate 15.2 and 14.8. Size of the sexual organs was not affected by feeding level. Rate of gain of the sows during the interval from weaning to estrus was influenced by feeding level: +4.1 kg and -2.3 kg, respectively, for the sows in estrus within 21 days of weaning. Sows with induced estrus shed significantly more ova than sows in which estrus was not induced (21.7 and 15.0 respectively). Loss of weight, loss of heart girth and loss of back-fat thickness during previous lactation (absolute and relative) did not differ for sows with or without induction but was higher for sows with a spontaneous estrus between 10 and 21 days after weaning than for sows with an estrus within 10 days after weaning. Ovulation rate was not influenced by weight at weaning or at estrus, weight loss during lactation, gain during the interval from weaning to estrus or size of the preceding litter at birth.

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