Summary. For the modern world, when there is a constant shortage of food stocks, is the primary task for its completion

For the modern world, when there is a constant shortage of food stocks, is the primary task for its completion. Important gains productive use of cows, first of all, highly productive cattle, which depends on the Economics of production and efficiency of the breeding herd. The use of long cows reduces annual culling, helps a deeper appreciation of the main herd, increases the specific weight of cows, as well as more rapid repair of the herd. However, the share of the heritability of traits is only 30 %, and the remainder is formed under influence of various external factors.

In this connection, in the present time the problem of productive longevity cows interest in scientists and practitioners, because they often do not live to the age of 5-6 lactations, which could show the maximum efficiency and the share of such animals, unfortunately, constituting the bulk.

This happens because of infringements of a metabolism, reduced reproductive ability, the inability of animals to adapt to intensive technologies.

Therefore the study of the effects of various determinants of productive longevity Simmental cows, is an urgent problem of cattle-breeding in the region, in particular in the territory of the South Urals Republic of Bashkortostan.

Within a single species of animals belonging to different lines have different lifetime. Only some groups of animals there is a genetic predisposition for a long high productivity and resistance to various diseases.

When selecting lines improves the breed you should consider the level of development of evidence was found only in one or the other line and the ability to convey these characteristics are inherited by subsequent generations.

©Kaznabaev R.F.