Amaç: Bu çalışmanın amacı, ıslah programlarında kullanılmak üzere doğrusal tip özellikleri, verim özellikleri ve birinci laktasyon karlılığı arasındaki genetik korelasyonların tespitini yapmaktır.
The authors thanks the dairy farm owners and Hatay Dairy Cattle Breeders' Association.
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.
Primary Language | English |
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Subjects | Zootechny (Other) |
Journal Section | Research Articles |
Authors | |
Publication Date | December 29, 2020 |
Submission Date | October 7, 2019 |
Published in Issue | Year 2020 Volume: 61 Issue: 2 |
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