Akademik Veri Yönetim Sistemi
Hayvansal Üretim, cilt.61, sa.2, ss.83-90, 2020 (Hakemli Dergi)
Objective: The aim of this study is to determine genetic correlations between lineartype traits, yield characteristics and first lactation profitability for use in selectionprograms.Material and Methods: The research was carried out in Hatay province between 2012-2017. A total of 810 cows in the first lactation were used in the study. Analysis ofvariance and covariances of genetic parameters was carried out with MultivariateLimited Maximum Likelihood test.Results: The average first lactation net profit, 305-d milk yield, first calving age,conception rate at first service, and calving ease rate were determined as 540 US$, 6008kg, 793 d, 61.6%, and 91.7%, respectively. Heritabilities of linear type and productiontraits ranged from 0.10 to 0.42 and 0.04 to 0.39, respectively. The genetic correlationsbetween first lactation profitability and type traits ranged from -0.08 and 0.42, whilebetween first lactation profitability and production traits ranged from 0.06 and 0.34. Thehighest genetic correlation was between first lactation profitability and central ligament(0.42), while the lowest genetic correlation was between first lactation profitability andudder depth (-0.08). The highest genetic correlation was between first lactationprofitability and lactation protein yield (0.34), while the lowest genetic correlation wasbetween first lactation profitability and conception rate at first service (0.09). Geneticcorrelations between type and production traits varied from -0.42 (FA and CFS) to 0.49(DC and 305-d MY).Conclusion: These results showed that primiparous cows having more angular, strongfore udder attachments, strong foot and legs structure were more profitable andopportunities of selection programs by using genetic correlations between linear typetraits and production characteristics. It also concluded that the first lactationprofitability could be used successfully in Turkish dairy cattle breeding programs.