Effect of live weight and body composition of gilts at 24 weeks of age on subsequent reproductive efficiency
作者： R. H. King
DOI: 10.1017/S0003356100004311
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摘要: A total of 96 gilts were used in two experiments to determine the effect live weight and body composition at about 170 days age on attainment puberty, ovulation rate subsequent reproductive efficiency. In first experiment 48 crossbred (Large White ♂ × Landrace ♀) randomly allocated 21 each six treatment groups which gave different intakes a protein-adequate diet. The food designed achieve weights ranging from 59·6 118·0 kg boar introduction age. Age puberty declined linearly 202 173 with increasing ( P second experiment, four littermates 12 litters 28 groups. offered diets varying protein adequacy feeding levels up 165 comprised factorial design factors being (light, L or heavy, H) fat level (lean, 1 fat, f relative content). At introduction, mean 70·6, 71·5, 101·3 100·0 kg, backfat depths 11·3, 20·9, 21·7 27·0 mm for LI, Lf, HI Hf groups, respectively. Heavier younger (183 v. 199 days, 9·5, 195 both neither efficiency after parturition nor performance their piglets was significantly affected by introduction.
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