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In an initial experiment with forty gilts, doubling the daily feed allowance from 1 \m=.\8to 3 \m=.\6kg for only the first feed following service in early oestrus increased significantly the subsequent litter size from 8\m=.\95\m=+-\0\m=.\53to 10\m=.\8\m=+-\0\m=.\40pigs born. In a second experiment with twenty gilts, the increase in feed allowance was from 1\m=.\4to 4\m=.\1kg for the single feed given 12 hr after onset of oestrus and this increased significantly the number of corpora lutea at the 13th day of pregnancy from 12\m=.\14\m=+-\0\m=.\86to 14\m=.\71\m=+-\0\m=.\42.

THE INFLUENCE OF NUTRITION DURING OESTRUS ON OVULATION RATE IN THE SOW