Abstract
The article discusses the effectiveness of the growth and development of heifers of the Red-and-White breed grown according to intensive technology in a dairy complex with loose housing in Agrosoyuz-Krasnoe Seltso LLC, Ruzaevsky district of the Republic of Mordovia. Replacement heifers of the Red-and-White breed have an early maturing type and at 13-15 months of age reach a live weight of more than 400 kg at the time of fruitful insemination. Heifers raised by intensive technology have daily gains of more than 850 grams. It was established that under the same conditions of feeding and keeping, the heifers obtained from the bull of the Reflection Sovering line, weighing 398 kg at the first insemination, had an advantage, which is 8 kg more than the young animals obtained from the bull of the Vis Back Ideal line and the age of the first insemination was 417 days or 6 days earlier than from the second line bull Whis Back Idial.
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