Phenotype and genotype variability and corelations [i.e. correlations] between milk yield traits of Black and White cattle breed primiparous cows | Fenotipska i genotipska varijabilnost i i povezanost osobina mlečnosti prvotelki Crno-Bele rase
2012
Stanojević, D., Poljoprivredni fakultet, Beograd - Zemun (Serbia) | Đedović, R., Poljoprivredni fakultet, Beograd - Zemun (Serbia) | Bogdanović, V., Poljoprivredni fakultet, Beograd - Zemun (Serbia) | Popovac, M., Poljoprivredni fakultet, Beograd - Zemun (Serbia) | Perišić, P., Poljoprivredni fakultet, Beograd - Zemun (Serbia) | Beskorovajni, R., Institut PKB Agroekonomik, Beograd - Padinska Skela (Serbia)
Aim of this paper was to assess the values of genetic parameters which have crucial influence on selection effect. Values of phenotype variability as well as coefficient of heritability and correlations between milk yield traits analyzed in this research are shown in this paper. The paper includes 1109 first standard lactations of Black and White breed cows, offspring of 9 fathers bred at 7 farms of Agricultural Corporation Belgrade (Serbia) during 2008. The paternal influence was researched as well as breeding farm, calving season influence to phenotype expression and variations of milk yield traits in standard lactation. Statistically very significant (p is less than 0,01) influence of the bull, farm and calving season on phenotype expressiveness, variability of milk yield, milk fat yield and protein yield in standard lactation was determined. Determined values of heritability for milk yield traits, milk fat contents, protein contents in milk, milk fat yield and milk protein yield were: 0.115, 0.049, 0.017, 0.119. and 0.111, respectively. Genetic correlations coefficient values of milk yield traits were from: -0.746 (milk fat yield – protein content) to 0.983 (milk fat yield-protein yield).
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