Abstract
The basis for selection work is knowledge of the quality of bull sires used for conception, as well as how the major traits are passed on to the progeny. BLUP method (Best Linear Unbiased Prediction) is the basis of the most favourable solution for evaluation of additive gene value in cattle production, and it is implemented in various variants depending on the structure of data used. This research included 2.121 Simmental first cavers under control, with lactations completed within one year. All first calvers were located on holdings of individual agricultural producers on the territory of the Republic of Serbia. Evaluation of the bull breeding value for lactation duration, milk production, milk fat yield, yield of 4% FCM and percentage of milk fat, was carried out by using the mixed model (BLUP), the calculation included random effect of bull sire and fixed effect of the region, year and season of calving. In this study, bull sires which had in two or three regions over 20 daughters - first calvers of Simmental breed. Number of first calving heifers ranged from 22 to 215 animals per bull sire. By using BLUP method in evaluation of breeding value of bulls in terms of yield of milk, milk fat, content of milk fat and 4% FCMI and by ranking, results were obtained showing superiority and inferiority of breeding males.
Highlights
Simmental breed of cattle is predominant in Central Serbia, where the total cattle population is approx. 819 000 heads, of which approx. 538.000 are cows and pregnant heifers
Vidović et al (1993) evaluated the breeding value of Simmental bulls based on their progeny using both Best Linear Unbiased Prediction is used (BLUP) and CC method
Results obtained by authors indicated that the evaluation of the bulls’ breeding value and their ranks, obtained by BLUP-1 and BLUP-2 methods, were similar to evaluation and rank obtained by CC method
Summary
Simmental breed of cattle is predominant in Central Serbia, where the total cattle population is approx. 819 000 heads, of which approx. 538.000 are cows and pregnant heifers. Simmental breed of cattle is predominant in Central Serbia, where the total cattle population is approx. Active population of Simmental breed in Republic of Serbia consists of animals recorded in the main livestock/cattle registry In evaluation of breeding value for milk traits/performance, especially of bulls in progeny testing, in Serbia until recently the CC method – Contemporary comparison was used, as well as selection index, and in last years, the Best Linear Unbiased Prediction is used (BLUP). According to Sullivan and Schaeffer (1994) the Best Linear Unbiased Prediction (BLUP) has become world standard in evaluation of the genetic value. Vidović et al (1993) evaluated the breeding value of Simmental bulls based on their progeny using both BLUP and CC method. Results obtained by authors indicated that the evaluation of the bulls’ breeding value and their ranks, obtained by BLUP-1 and BLUP-2 methods, were similar to evaluation and rank obtained by CC method
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