ORIGINAL PAPER
Fertility measures in Polish Black-and-White cattle. 1. Genetic parameters of heifer fertility traits
W. Jagusiak 1  
 
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Agricultural University of Cracow, Department of Genetics and Animal Breeding, Mickiewicza 24/28, 30-059 Kraków, Poland
CORRESPONDING AUTHOR
W. Jagusiak   

Agricultural University of Cracow, Department of Genetics and Animal Breeding, Mickiewicza 24/28, 30-059 Kraków, Poland
Publication date: 2005-08-04
 
J. Anim. Feed Sci. 2005;14(3):423–433
 
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ABSTRACT
Genetic parameters of heifer fertility measures were estimated. Data were records of 42 283 first-parity Black-and-White cows. The percentage of cows that did not repeat heat was 73 at the 56th day and 69 at the 72nd day after first insemination. Heritabilities of non-return rates to the 56th day and 72nd day were 0.012 and 0.010, respectively. Heritabilities of age at first insemination, age at conception and age at calving were 0.324, 0.312 and 0.296, respectively. Phenotypic correlations ranged from 0.78 between age at first service and age at conception to 0.98 between age at conception and age at calving. The genetic correlations were high (0.96 and higher). Genetic correlations between non-return rates and the remaining traits ranged from -0.11 to 0.10.
ISSN:1230-1388