Heritability and evaluation repeatability selection traits of Kyiv type Ukrainian Black-and-White dairy cattle
DOI:
https://doi.org/10.31548/dopovidi2019.06.016Keywords:
heifers, cows, milk yield, live weight, fertility, milk qualityAbstract
The genotypic parameters of selection traits have their own characteristics in each population. Knowledge of their parameters allowing to effective strategy choose for animals breeding. The studies were conducted on the livestock of Kiev factory type Ukrainian Black-and-White dairy breed. We studied the heritability and evaluation repeatability of animals breeding traits during early ontogeny and subsequent productive use. Heritability was studied by doubling correlation coefficient between mothers and daughters and by one-way variance analysis (ANOVA) in the half-sisters groups formed by the sires. The repeatability of selection traits estimates in ontogenesis evaluated by calculating repeatability coefficient and correlation coefficients. It is found that the best inheritance are live weight of 15-18 months aged heifers and their average daily gain from birth to 15 months (h2 = 0,257-0,278). The average daily gain evaluation repeatability of heifers in different ages not observed. Thus, breeding heifers by growth rate and live weight is effective only before starting reproductive use. The efficiency of selection of first- calving cows by live weight is low (h2 = 0.04-0.06). The big difference of the first calving age is due. With traits of milk production the highest heritability of milk yield, output of milk fat and milk protein in the first lactation (h2 = 0,327-0,364). The genotype influence of first calving age and life productive use was significant (h2 0,192 and 0,173). Evaluation repeatability of milk yield (rw = 0,454), milk fat yield (rw = 0,428) and milk protein yield (rw = 0,455) and lactation duration (rw = 0,409) were revealed. The research results should be used to correct of selection methods of Kiev factory type Ukrainian Black-and-White dairy cattle. In breeding plans should consolidate the parameters of heifer’s selection by live weight at the beginning of reproductive use (15 months), and evaluate sires for daughters first calving age.
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