Source: https://abg-journal.com/index.php/journal/article/view/202
Timestamp: 2019-04-25 22:08:43+00:00

Document:
Researches were carried out on estimation cows of Ukrainian Black-and-White dairy and Holstein breeds by the method of linear classification in the herd of pedigree farm LLC "Vladana" in Sumy region.
When comparing cows of Ukrainian Black-and-White dairy with Holstein, the improving influence sires of Holstein breed on the development of conformation of cows in the herd according to indicators of the linear assessment by 100-point system was found. The difference was based on the group traits of dairy type 1,1 score, legs – 1,3, udder – 1,6 and final score – 1,2. In all comparisons, the difference was highly reliable at P < 0.001.
By descriptive traits improvement with a significant difference were observed in height (by 0,3 scores; P < 0,05), body depth (by 0,3 scores; P < 0,05), rump width (by 0,6 scores; P < 0,001), angle of pelvic limbs (by 0,4 scores, P < 0,001), foot angle (by 0,9 scores, P < 0,001), front udder attachment (by 0,4 scores, P < 0,001), central ligament (by 0,8 scores; P < 0,001), udder depth (by 0,9 scores; P < 0,001) and teats length (by 0,3 scores; P < 0.01).
Animals of Holstein breed compared to Ukrainian Black-and-White dairy became more narrow-chested (by 0,7 scores; P < 0,001).
The identified relationships between linear traits and value of milk yield of first-born cows in the controlled herd were determined the existence of a reliable correlation between estimation both for individual complexes of conformation traits and overall assessment by 100-point classification system (r = 0,198–0,464; P < 0,001).
Positive and reliable correlation with milk yield was observed by a number of descriptive traits: height (r = 0,359), body depth (r = 0,384), angularity (r = 0,474), rump width (r = 0,311), posture of pelvic limbs (r = 0,361), foot angle (r = 0,273), front (r = 0,355) and rear udder attachment (r = 0,330), central ligament (r = 0,311), locomotion (r = 0,305). Body condition score was correlated negatively (r = -0,168).
Thus, the determined correlations between linear traits of the conformation and milk yield for lactation have been indicated the reliability of selection of cows by conformation type, simultaneously improving milk production.
The using sires of Holstein breed during absorbed crossing with Ukrainian Black-and-White dairy breed have been improved linear traits of the conformation type in their offspring.
Positive relationship between group and main descriptive linear traits characterizing conformation, and value of milk yield would be facilitated by efficient indirect selection based on the type and productivity.
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