Estimation of the genetic parameters for test-day milk yield in Holstein cattle

Rodica Stefania Pelmus, Horia Grosu, Mircea Catalin Rotar, Mihail Alexandru Gras, Elena Ghita, Cristina Lazar

Abstract


The objective of this study was to determine the genetic parameters represented by heritability for test-day milk yield, the genetic correlations between test-day milk yield and the breeding value for Holstein cows. The model used was random regression test-day animal model. the data set consist of 216 test day records from 30 cows. The average number of test day per lactation was seven. The heritability estimates for test-day milk yield ranged from 0.43 at 250 th day in milk to 0.60 at 10 th day in milk. Genetic correlations between individual test-days milk yield were high and positive.

Keywords


breeding value;random regression test day model;test day milk yield

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References


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LUCRARI STIINTIFICE ZOOTEHNIE SI BIOTEHNOLOGII (SCIENTIFIC PAPERS ANIMAL SCIENCE AND BIOTECHNOLOGIES)

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