REALIZATION OF THE BREEDING VALUE OF HOLSTEIN STUD BULLS OF FOREIGN SELECTION

Abstract

Sixteen stud bulls of the Holstein breed of foreign selection were evaluated for the quality of offspring in four dairy herds of farms in Zhytomyr and Kyiv regions according to the method of M.M. Mayboroba, S.G. Germanchuk, Yu.P. Polupan and D.M. Basovsky (2019). Studies have found that the estimated indices of breeding value (EBV) of bulls vary in milk yield from -287 to +1525 kg, fat content in milk from -0,07 to +0,15%, protein content – from -0,08 to +0,11%, milk fat from -16 to +59 kg, milk protein from -14 to +50 kg. The highest positive values of indices for quantitative signs of milk productivity have bulls N. Seddin DE 352642486 (milk yield +1525 kg, milk fat +59 kg, milk protein +50 kg), Shirley NL 447860719/60719 (+1314 kg; +52 kg and +36 kg, respectively and Bugatti DE 538441328/41328 (+856; +45; +32). Bulls Sarukko DE 350995813/95813 (-287; -16; -14) and Assal DE 579542573/42573 (-252; -9; -10) have negative index values. The highest positive values of the fat percentage index were recorded in bulls Assal DE 579542573/42573 (+0,14%), Bugatti DE 538441328/41328i (+0,15%), Glamour Red NL 713313332 (+0,14%), Faun DE 356552537 (+0,13%); index of protein percentage in bulls Argonaut DE 538441348 (+0,11%), Bugatti DE 538441328/41328 (+0.06%), Masiro DE 354071654/71654 (+0,06 %). Correlation analysis revealed the relationship between the indices of breeding value of stud bulls calculated by us in farms and the data of the catalogs of the corresponding years for all signs of milk productivity, the correlation coefficients are positive and highly probable – from +0,572 to +0,724, P<0.001–0.05. Comparative analysis found that 6 stud bulls out of 16, which is 37.5%, to one degree or another confirmed the breeding value indices for the signs of milk production, declared in the relevant catalogs.