Comparison of energy requirements of non-lactating and lactating Hereford cows and estimates of energetic efficiency of milk production.
D000821:Animal Feed; D000818:Animals; D001835:Body Weight; D002417:Cattle / Q000378:metabolism*; D004032:Diet; D004734:Energy Metabolism; D005260:Female; D007774:Lactation; D008892:Milk / Q000032:analysis; D011247:Pregnancy; D014886:Weaning