Evaluation of breeding groups by living weight of over-age cows depending on breeding

 The assessment of cattle of black-and-white, red steppe, Simmental breeds, differentiated by live weight, was carried out. Three groups were formed: selection, production, and marriage. The selection parameters are calculated using the standard deviation. The calculated parameters of selection of animals of breeding groups by live weight in full-aged cows of the black-and-white breed are 527–472 kg, red steppe-595–514, Simmental breed from the Novosibirsk region – 555–447, the Republic of Khakassia – 610–475, Hereford – 570–462 kg. The animals of the breeding group of the black-and – white breed have an average live weight of 552.5 kg, the red steppe – 641.1 kg, the Simmental Novosibirsk region – 576.7 kg, the Republic of Khakassia – 648 kg, and the Hereford Region-591.1 kg. The analysis of interbreed differences of cows of breeding groups shows that animals of Simmental and Red steppe breeds surpass their peers in most measurements. Animals of the black-and-white breed are the leaders in milk yield and milk content index, Red steppe-in milk fat content and milk fat, Simmental cows bred in the Republic of Khakassia – in live weight. The assessment of production groups of animals by live weight allows us to note that the black-and-white breed surpasses its peers in milk productivity and is characterized by broadness; the red steppe breed – by live weight and fat content of milk and is characterized by elongation; the Simmental breed has a greater development of high-altitude measurements. Evaluation of breeding groups of animals by live weight allows us to note its relationship with other productive traits. The formation of a breeding group with a high live weight allows you to create a tall and stretched array of cattle.