111111 11111 111111 111111
2222222222222222 222222222222222222 22222222222222222222 22222222222222 2222222222 22222222222222222 2222222222 2222222222222222
11111111111111111111111
222222222 2222222222 222222222 2222222222222222222 22222222222 2222222222222222 222222222222 222222222 22222222222222222222222222
11111111111111111111111
2222222222222222 2222222222222222 222222222 222222222222 222222222222222 222222222222222222222 22222222 22222222 22222 22222222222
1111111111 1111111111111

 

Agrarian education and science

scientific journal

Growth and Development Indicators of Repair Heifers-Daughters of Different Bulls-Producers

УДК 636.064.6:636.082.355

Authors:

 Margoeva M. V.,

Shatskikh E. V.

This article presents a comparative growth and developmental assessment indicators of Holstein breed repair heifers obtained from different bulls. Given the intensity of milk production today, it is very important to monitor the quality of growing young stock, which replaces the main milking stock. We took into account the main indicators of primary intrinsic productivity of repair heifers: live weight dynamics, absolute and daily average growth, relative rate of growth, as well as the age and weight of the first fruitful insemination. It was found that daughters of Progen Orion bull of Reflexion Sovering line have a number of superiorities in growth and development indicators over daughters of Denovo Halstead bull of Vis Back Aidial line. However, by eighteen months of life this difference is almost imperceptible, growth and development indicators of the studied animals are approximately at the same level. Progeny of Progen Orion bull of Reflexion Sovering line reach the necessary weight for insemination at an earlier age, this may contribute to faster herd turnover and thus favor breeding economic efficiency stock in the future.

Keywords: repair heifers, Holstein breed, growth, development, live weight dynamics, absolute gain, average daily gain, relative growth rate.

Download the full text of the article

 

Federal State Budget Educational Institution of Higher Education "Ural State Agrarian University"

Address: 620075 Ekaterinburg, ul.Karla Libknekhta, 42,

+7 (343) 221-40-01; 371-33-63 - rectorate

+7 (343) 221-40-12 - accounting

Search