title: [Scientific problems involved in increasing the productive period and resistance of laying hens].
mesh_terms: D000822:Animal Husbandry / Q000379:methods*; D000818:Animals; D002645:Chickens / Q000502:physiology*; D004531:Eggs; D005260:Female; D010060:Ovulation; D011201:Poultry Diseases / Q000517:prevention & control*; D013997:Time Factors
vernacular_title: Zadachi nauki po uvelicheniiu produktivnogo perioda i rezistentnosti kur-nesushek.