SIRE INFLUENCE ON REASONS OF DAUGHTER CULLING FROM THE HERD

.

SMALL BUSINESS DEVELOPMENT AS A FACTOR OF HIGHER COMPETITIVENESS OF AGRICULTURAL PRODUCTION, INFRASTRUCTURE OF THE GRAIN MARKET IN AN OPEN ECONOMY: REALITIES AND PROSPECTS (A VIEW FROM THE REGION), ...

М., Post-graduate student Shendakov A.I., Doctor of Agricultural Sciences Orel State Agrarian University, Orel City, Russia E-mail: bio413@ya.ru, Phone: 8-953-816-78-84 ABSTRACT The article presents the results of bull’s evaluation on susceptibility of cows to culling reasons, including udder, legs and internal organs diseases, surgical diseases, tuberculosis and etc. <...> It has been found out that bulls are able to have a significant impact on the reasons for culling heifers from the herd. <...> More than that, heifers are able to inherit through their fathers their maternal ancestors’ resistance to gynecological diseases. <...> Buyan bulls have ap-proximately 7,5% of heifers culled for old age, sire Dar 2383 have 3,7 and 4,9% of heifers accordingly culled for leucosis and tuberculosis. <...> The above mentioned bulls have 2,4-3,7% of heifers with internal organs diseases. <...> Due to the high milk production and acclimatization abilities unit weight of cows of black-motley breed in our country has significantly grown over the last ten years. <...> However, despite a number of advantages, black-motley breed of cattle needs to improve its productive and technological features. <...> Holstein genotype has been widely used to improve this breed for several decades already since the former is closely related to the latter and quite common in the United States, Canada, Germany. <...> Crossbred cows have high productivity, suitable for machine milking udder, but at the same time they have low rates of life expectancy and reproductive qualities. <...> These animals usually distinguish in intensive metabolism and in rapid outflow of the herd. <...> Premature culling of cows from the herd reduces the estimation reliability for productivity and breeding qualities, since they do not give a large number of descendants. <...> Moreover, owing to gynecological diseases, which greatly impede productivity of a herd, farms bear economic losses. <...> One of the most burning issues in dairy cattle breeding in Russia is the evaluation of its breeding value, and particularly, a reliable assessment of bulls’ breeding qualities influencing their offspring’s productivity. <...> S.N. Haritonov and his coauthors [7] pointed out that sperm of progeny evaluated bulls is usually used several years in the Russian Federation, but during this period <...>

• Похожие документы из РУАЭСТ
• |
• Похожие документы из Руконт