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The effect of nutrition on the reproductive performance of first litter sows 3. the response to graded increases in food intake during lactation



The effect of nutrition on the reproductive performance of first litter sows 3. the response to graded increases in food intake during lactation



Animal Production 42(1): 119-126



Severty-two animals were used in an experiment to study the response of first-litter sows to graded increases in daily food intake during a 28-day lactation. Six food intakes, ranging from 1.5 to 4.8 kg/day were compared. The results showed that both live-weight loss and backfat loss during lactation increased linearly as food intake decreased (P < 0.01). Subsequent ovulation rate was unaffected by food intake but both weaning to mating interval (Y1, days) and the proportion of sows exhibiting oestrus within 8 days of weaning (Y2) improved linearly with increase in daily food intake during lactation (X, kg) (P < 0.01); the respective linear regressions being Y1 = 39.0-6.26X and Y2 = 0.198X - 0.15. A sub-group of 24 gilts which were older at first conception (340.5 v. 213.5 days; P < 0.01) exhibited oestrus sooner after their first litters were weaned (12.8 v. 22.1 days; P < 0.05) than the remaining 48 younger animals. Nitrogen balance increased linearly with food intake (P < 0.01) but even at the highest food intake, nitrogen balance remained negative (-15.5 g N per day). Food intake had no effect on the growth rate of piglets to 3 weeks of age but in the 4th week of lactation there was a quadratic increase in piglet growth rate as sow food intake increased (P < 0.01).

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Accession: 006650163

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DOI: 10.1017/s0003356100017803


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