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The article presents a comparative assessment of growth performance and exterior features purebred bulls Ayrshire and brown Swiss breeds and their crosses with herefords. The highest live weight was different Swiss-Hereford cross-breeds. At the end of the trial period they reached a live weight of 429 kg and their superiority made up of the I, II, and III groups – 48; 38 and 20 kg, respectively. The levels of average daily increase in all age periods, these animals were significantly superior to their peers from other experimental groups. In the body type of the crossbred calves of both groups were closer to animals specialized meat breeds. They are distinguished by a compact body type, the greater live weight and value of the latitudinal measurements. In general, the impact of Hereford resulted in more intensive growth and improvement of exterior-constitutional peculiarities of animals. КЛЮЧЕВЫЕ СЛОВА Промышленное скрещивание, индексы телосложения, породы.

CHARACTERISTICS OF GROWTH AND DEVELOPMENT OF YOUNG ANIMALS IN INDUSTRIAL CROSSBREEDING IN DAIRY CATTLE