Genetic evaluation of reproductional and metabolical disorders in Holstein dairy cows
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The study focuses on estimating genetic parameters and breeding values for resistance to diseases and health disorders, most commonly found in the first third of lactation, and for the selected auxiliary trait, which is the milk fat:protein ratio, determined on the first control day. The heritabilities of selected traits estimated by the linear animal models were low, ranging from 0.01 (retained placenta, paresis, ketosis) to 0.10 (fat:protein ratio). The strongest genetic correlations were found between paresis and displaced abomasum (0.75±0.48), retained placenta and metritis (0.61±0.21), and between endometritis and displaced abomasum (0.49±0.38). The fat:protein ratio was genetically correlated with ketosis and displaced abomasum, and other relations were low and insignificant.
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