Dergiler / Hayvansal Üretim / 2020 / Cilt: 61 - Sayı: 2
Genotypic Correlations among First Lactation Profitability, Linear Type and Production Traits of Black and White Cows in Turkey
- Dergi
- Hayvansal Üretim
- Sayfa
- 83–90
- DOI
- —
Özet
Objective: The purpose of this study was to use genetic correlations between linear type, production traits and first lactation profitability for the breeding programs. Material and Methods: A Total of 810 primiparous cows were used. Multivariate Limited Maximum Likelihood was used to determine the variance and covariance components of the genetic parameters. Results: The average net profit, 305-d milk yield, first calving age, conception rate at first service and calving ease rate were determined as 540 US$, 6008 kg, 793 d, 61.6% and 91.7% respectively. Heritabilities of linear type and production traits ranged from 0.10 to 0.42 and 0.04 to 0.39 respectively. The genetic correlations between first lactation profitability and type traits ranged from -0.08 and 0.42, while between first lactation profitability and production traits ranged from 0.06 and 0.34. The highest genetic correlation was between first lactation profitability and central ligament (0.42), while the lowest genetic correlation was between first lactation profitability and udder depth (-0.08). The highest genetic correlation was between first lactation profitability and lactation protein yield (0.34), while the lowest genetic correlation was between first lactation profitability and conception rate at first service (0.09). Genetic correlations between type and production traits varied from -0.42 (FA and CFS) to 0.49 (DC and 305-d MY). Conclusion: These results revealed that primiparous cows having more angular, strong udder attachments, strong foot and legs structure were more profitable and opportunities of genomic selection programs by using genetic correlations between linear type and production traits, and first lactation profitability could be achievable within dairy cattle breeding programmes.
Abstract
Amaç: Bu çalışmanın amacı, ıslah programlarında kullanılmak üzere doğrusal tip özellikleri, verim özellikleri ve birinci laktasyon karlılığı arasındaki genetik korelasyonların tespitini yapmaktır.