The effect of varied nutrient intake levels upon the performance of laying hens.
D000821:Animal Feed; D000818:Animals; D002645:Chickens / Q000254:growth & development*; D004032:Diet; D004044:Dietary Proteins / Q000378:metabolism; D005260:Female; D008903:Minerals / Q000378:metabolism; D014815:Vitamins / Q000378:metabolism
D004044:Dietary Proteins; D008903:Minerals; D014815:Vitamins