Summary. In an initial experiment with forty gilts, doubling the daily feed allowance from 1 ·8 to 3 ·6 kg for only the first feed following service in early oestrus increased significantly the subsequent litter size from 8·95 ± 0·53 to 10·8 ± 0·40 pigs born. In a second experiment with twenty gilts, the increase in feed allowance was from 1·4 to 4·1 kg 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 12·14±0·86 to 14·71±0·42.
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Lodge et al. (1968) studied this question.
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