FIELD: veterinary. SUBSTANCE: method involves injection of testosterone propionate to young ewe at the age 11-12 months and to ewe at period of interseason anestrus at the dose 0.225-0.230 mg/kg living mass following by detection of animal in rut. Method ensures to increase effectiveness of animal selection and decrease its period by 30-fold. EFFECT: improved method of determination. 2 cl, 6 tbl
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