title: The effect of levels of protein and vitamin B12 in hen diets on egg production and hatchability of eggs and on livability and growth of chicks.
mesh_terms: D000818:Animals; D001835:Body Weight; D002645:Chickens / Q000254:growth & development / Q000378:metabolism / Q000502:physiology*; D004044:Dietary Proteins / Q000378:metabolism*; D004531:Eggs; D005260:Female; D005298:Fertility; D008297:Male; D011201:Poultry Diseases; D014805:Vitamin B 12 / Q000378:metabolism*; D014806:Vitamin B 12 Deficiency / Q000662:veterinary
chemical_list: D004044:Dietary Proteins; D014805:Vitamin B 12