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TITLE:

THE INFLUENCE OF MATERNAL AGE AND LIVE WEIGHT OF HEIFERS AT BIRTH ON THE REPRODUCTIVE ABILITY AND MILK PRODUCTION OF COWS OF THE YAROSLAVL BREED

AUTHORS:

Y.A. Yuldashbaev, O.K. GŠ¾gaev, T.A. Kadieva , R.S. Godzhiev, A.R. Demurova, E.A. Valieva , L.Kh. Tokhtieva

ABSTRACT:

Abstract: One of the leading places in the sectors of agriculture belongs to the dairy cattle. The importance of this industry is determined not only by the high share of gross production, but also by the great influence on the economy of agriculture and the level of food supply to the population. Within the framework of the State Program of development of agriculture and regulation of markets of agricultural products, raw materials and food for 2013-2020, it is of paramount importance to increase the proportion of milk and dairy products to 85.3%. Specific indicators of the effective development of dairy cattle are: - the term of productive use of cows; - the reproductive qualities; - the terms of cultivation of repair young growth and their quality increasing efficiency of cattle breeding. The work contains the research on the influence of individual factors on milk productivity and reproductive quality of cows. The age of their mothers and the live weight of heifers at birth are taken into account. It was found that the best indicators of reproductive ability had cows received from mothers of the II-nd calving, whose level of milk yield was 4218 kg. In addition, the analysis of the data showed that the heifers have a positive relation between the live weight at birth and subsequent milk production. So with the increase in fetal weight at birth, there is an increase in the level of milk yield from 3448 to 4341 kg of milk. Key words: cow, milk productivity, lactation, reproductive qualities, breeding, economic use, age of mothers, live weight at birth.

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