Оценка и отбор племенных быков белорусской черно-пестрой породы по спермопродукции
2011
Mostovoj, D.E., National Academy of Sciences. Scientific and Practical Center of Animal Breeding (Belarus)
Nowadays breeding of black-and-white cow breed in the Republic of Belarus is based on principles of large-scale selection. The main characteristic of this work is evaluation of bulls by propagative feature and selection of the most valuable individuals for the improvement of breeding qualities of the herd. Sperm production of bulls is evaluated with the help of such indexes, as ejaculate volume, sperm density, spermatozoids' concentration, survivability and frost resistance. The possibility of selection of herd bulls on the indicators of sperm within an early period of use is studied. Population and genetic parameters of sperm of bulls for the first 4–6 months of use are identified. The average ejaculate volume is 3.98 ml, sperm concentration is 1.25 milliard spermatozoids per 1 ml, the number of spermatozoids in an ejaculate is 4.87 milliard, and variability of characteristics is 23.5; 32.3 and 30.8%. Heritability (h2) of a number of sperms in an ejaculate is 0.12. The index method of evaluation and selection of herd bulls on sperm within an early period of use is developed. Its reliability is proved by a high correlation coefficient (rs = 0.85) between the indicators of a sperm index for the first 4–6 months and for the whole period of use.
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