AGE INFLUENCE AT THE FIRST INSEMINATION AND THE SERVICE PERIOD ON LONGEVITY AND LIFE-LONG PRODUCTION OF MILK IN SIMMENTAL COWS
Zvonko Spasić1, Nikola Stolić2, Božidar Milošević1, Zoran Ilić1, Ljiljana Anđušić1
1Faculty of Agriculture, University of Priština
2Agricultural College Prokuplje, Republic of Serbia
spasic.zvonko@gmail.com
Genetic improvement of quantitative traits in domestic animals is not possible without being familiar with necessary population-genetic parameters. Higher values of heritability indicate possibility of more effective selection work and traits improvement, while lower values show that we cannot improve these traits (i.e. reproductive traits) to such an extent within the population. Therefore, in this paper we set up an assignment to estimate values of heritability and phenotypic correlations among reproductive traits in the population of Simmental cows in the area of Kosmet. Investigations have been performed at the farm Dubrava in Istok, on the basis of data regarding milk production and the duration of cows’ exploitation in the production process. On the basis of our assignments in this paper the average data values of the investigated reproductive traits have been presented. The aim of this paper is, along with determination of needed parameters, to explore the possibility for application of the obtained results in the selection work in order to improve the mentioned traits.
Keywords: heritability; phenotypic correlations; Simmental breed; service-period
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