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15 per cent abnormal Agric amount Animal Sci average basal ration Berkshire birthweight boars bodyweight Bowland Braude calcium carotene Chester White clover colostrum corpora lutea crude protein daily days of age days of lactation deficiency diet difference effect embryos energy estimated farrowing feed unit foetus folic acid follicles gave birth gestation gilts gilts given Gloucester Old Spots groups herd increase kcal lactating sows lactation Landrace Large White Lenkeit loss lucerne lucerne meal maize manganese mated mean weight milk yield National Research Council nitrogen normal number of pigs ovulation ovulation rate oxytocin pantothenic acid parturition pasture percentage phosphorus pigs born plane of nutrition Poland China pregnancy pregnant sows produced protein reproduction requirement Research Council 1953 riboflavin second oestrus significant significantly sow's milk sows given soya bean meal stillbirths studied suckling supplement swine U.S. National Research uterus values vitamin vitamin B12 weaning weight gain young pigs