Breeding values for overall claw and horn diseases and lameness

ZAVADILOVÁ, Ludmila, KAŠNÁ, Eva a KRUPOVÁ, Zuzana., 2020 Breeding values for overall claw and horn diseases and lameness. In Generace za generací: šlechtění v našich chovech. Sborník ze semináře u příležitosti 90. narození prof. Václava Jakubce, DrSc.. Praha Uhříněves: Výzkumný ústasv živočišné výroby v.v.i., s. 72-78. ISSN 978-80-7403-236-3
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This work aimed to assess the suitability of a combination of claw and horn disease and lameness into a trait for genetic evaluation for resistance to claw and horn disease. Claw and horn disorders were observed in Holstein cows (29,291 cows and 42,247 lactations) calved in 2017-2020. The analysed traits were claw diseases, lameness, a combination of claw diseases and lameness. A linear animal model with repeatability was employed. The traits were defined as binary: occurrence of yes/no during lactation. Genetic parameters and breeding values were estimated. Correlations between breeding values approximated genetic correlations. Heritability for lameness was 0.03, for claw diseases 0.05 and heritability for their combination was 0.04. Relative breeding values ranged from 31.57 to 136.93 %; their reliability ranged up to 0.95 for the combination of claw disease was average reliability of 0.17. The correlation between breeding values for claw diseases and lameness was 48%, and that was for bulls with a breeding value reliability above 0.5. For all animals, this correlation was 27%. Therefore, we do not recommend combining lameness with claw and horn diseases into one trait for genetic evaluation.