UDC 636.061.4
DOI: 10.36871/vet.zoo.bio.202301011
Authors
Vitaly А. Kosov,
Lugansk State Agrarian University, Lugansk, Russia
Nikolay V. Pimenov,
Moscow State Academy of Veterinary Medicine and Biotechnology – MVA by K. I. Skryabin”, Moscow, Russia
Sergey N. Tresnitskiy,
Anatoliy S. Tresnitsky,
Don State Technical University,
Rostov-on-Don, Russia
Abstract
One of the signs of cattle breeding, which has received attention in recent years, is the exterior. The purpose of the research was to test the methodology of linear evaluation of dairy cattle. The average score of 84,1 points in Holstein-type cows strongly indicates the development of trunk signs, compared with a fairly good development of a similar group of articles in peers of the fatty-milk type. Holstein-type animals had the best udder development, with a score of 83 points. The highest and most reliable links between the signs of the exterior and the value of milk yield for lactation were revealed when assessing group characteristics characterizing the dairy type of cows, the development of the trunk and udder, with correlation coefficients that were in animals of Holstein and fatty-milk type, respectively, with the final overall type assessment (r=305 and r=0,493; p<0,462). The level of heritability sufficient for successful breeding by type was observed in Holstein-type cows for most descriptive, including important breeding characteristics, which include height in the sacrum, chest width, trunk depth, angularity, butt width, hock angle, anterior attachment of the udder, central ligament, length of the front milking and fatness.
Keywords
linear assessment, exterior, dairy cattle, breed, heritability, correlation
