TY JOUR TI BIOTECHNOLOGICAL METHODS OF INCREASING THE EFFICIENTY OF CATTLE BREEDING KW : postnatal pathology KW diseases of calves in the early postnatal period KW tissue drug KW weight gain KW efficiency of cattle. JO Vestnik of Kazan State Agrarian University AU Samodelkin, A.G. AU Eremin, S.P. PY 2014 IS 9 PB Kazan state agrarian University