Estimates of genetic trends for daily milk yield and somatic cell score of primiparous Holstein cattle in Iran
نویسندگان
چکیده
منابع مشابه
Genetic parameters for daily milk somatic cell score and relationships with yield traits of primiparous Holstein cattle in Iran
BACKGROUND Despite the importance of relationships between somatic cell score (SCS) and currently selected traits (milk, fat and protein yield) of Holstein cows, there was a lack of comprehensive literature for it in Iran. Therefore we tried to examine heritabilities and relationships between these traits using a fixed-regression animal model and Bayesian inference. The data set consisted of 1,...
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In this study test-day records of milk (kg), fat (g), and protein (g) yields, somatic cell score (SCS, cells/ML) collected by Animal Breeding Center of Iran during 2007 and 2009 were used to estimate genetic parameters using random regression model. Models with different order of Legendre polynomials were compared using Bayesian information criterion (BIC).For milk, fat yield and SCS genetic an...
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The aim of the present study was to estimate the genetic parameters and genetic trends of somatic cell score (SCS) in the first 3 lactations of Iranian Holstein cows by random regression (RR) animal model by using Restricted Maximum Likelihood (REML) method. The data set used in this analysis included observations of 340318 test-day records of 41526 cows in 288 herds; 89969 test-day of 11750 co...
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ژورنال
عنوان ژورنال: Journal of Applied Animal Research
سال: 2019
ISSN: 0971-2119,0974-1844
DOI: 10.1080/09712119.2019.1663741