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J. Dairy Sci. 86:2228-2235
© American Dairy Science Association, 2003.

Genetic Effects on Stillbirth and Calving Difficulty in Swedish Holsteins at First and Second Calving

L. Steinbock*, A. Näsholm*, B. Berglund*, K. Johansson{dagger} and J. Philipsson*

* Department of Animal Breeding and Genetics, Swedish University of Agricultural Sciences, SE-750 07 Uppsala, Sweden
{dagger} Swedish Dairy Association, SE-631 84 Eskilstuna, Sweden

Corresponding author:
L. Steinbock; e-mail:
lena.steinbock{at}hgen.slu.se.

In Swedish Holstein dairy cattle, genetic effects on stillbirth and calving difficulty were studied in 411,409 first- and 281,193 second-calvers. A linear single-trait sire-maternal grandsire model and a threshold model using a Gibbs sampling technique were used to analyse calving data from 1985 to 1996. In first calving when using the linear model, the heritability of stillbirth on the visible scale was 4% for the direct effect and 3% for the maternal effect. For calving difficulty it was 6% and 5% for direct and maternal effects, respectively. In second calving the corresponding heritabilities for the two traits were considerably lower, less than 1%. Adjusting for calving difficulty in linear analysis of stillbirth halved the heritabilities for the direct and maternal effects in first calving. When using a threshold model, heritabilities for stillbirth in first-calvers were 12% and 8% for direct and maternal effects, respectively, and for calving difficulty they were 17% and 12%. At second calving corresponding heritabilities were 2 to 4% for stillbirth and 4 to 7% for calving difficulty. The correlation between direct and maternal effects was around -0.1, irrespective of whether the linear or the threshold model was used for first-calvers. The genetic correlations between bulls’ EBV from first and second calving were 0.4 to 0.5 for direct and maternal effects in stillbirth, whereas they were 0.6 to 0.7 for calving difficulty. In first-calvers there was a substantial genetic variation in both traits, expressed by differences between breeding values of bulls, despite fairly low heritability. The results obtained in this study suggest that first-parity records should preferably be used for genetic evaluation of bulls for calving performance. In such routine evaluations both stillbirth and calving difficulty, and both direct and maternal effects, should be included.

Key Words: stillbirth and calving difficulty • direct and maternal genetic effects • threshold model

Abbreviation key: SLB = Swedish Holstein, HF = Holstein Friesian, REML = restricted maximum likelihood




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