title: Maintenance levels of protein and energy and the effect of egg production upon feed consumption of laying hens.
mesh_terms: D000821:Animal Feed; D000818:Animals; D001835:Body Weight; D002369:Castration; D002645:Chickens / Q000378:metabolism* / Q000502:physiology*; D004044:Dietary Proteins / Q000008:administration & dosage*; D004435:Eating; D004531:Eggs; D004734:Energy Metabolism; D005260:Female; D006799:Housing, Animal; D007273:Injections, Intramuscular; D008433:Mathematics; D009751:Nutritional Requirements; D010058:Oviposition; D011374:Progesterone / Q000008:administration & dosage; D013696:Temperature
chemical_list: D004044:Dietary Proteins; D011374:Progesterone