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15 per cent abnormal age at ﬁrst amount average basal ration Berkshire birthweight boars bodyweight Bowland calcium carotene Chester White cod liver oil colostrum corpora lutea crude protein daily day of lactation days of age deﬁciency diet Duroc embryos energy estimated farrowing feed unit ﬁrst litters ﬁrst oestrus foetuses follicles gave birth gilts gilts given Gloucester Old Spots groups herd increase inﬂuenced kcal lactating sows lactation Landrace Large White Lenkeit loss lucerne lucerne meal maize manganese mated mean weight milk yield months National Research Council nitrogen normal number of pigs ovulation ovulation rate oxytocin pantothenic acid parturition pasture percentage phosphorus pigs born Poland China pregnancy pregnant sows produced protein requirement Research Council 1953 riboﬂavin second oestrus self-fed signiﬁcantly sow’s sows given soya bean soya bean meal studied suckling supplement tankage U.S. National Research uterus values vitamin B1 weaning weight gain young pigs