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1 Department of Animal and Aquacultural Sciences, Agricultural University of Norway, P.O. Box 5003, N-1432 Ås, Norway
2 GENO Breeding and AI Association, P.O. Box 5003, N-1432 Ås, Norway
3 Department of Dairy Science, University of Wisconsin, Madison 53706
Corresponding author: Bjørg Heringstad; e-mail: bjorg.heringstad{at}umb.no.
The objective of this study was to examine associations between susceptibility to clinical mastitis and protein yield in first-lactation Norwegian Dairy Cattle (NRF) cows. Records from 372,227 first-lactation daughters of 2411 NRF sires were analyzed bivariately, using a threshold-liability model for clinical mastitis and a linear Gaussian model for 305-d protein yield. The mean (SD) of the posterior distribution of heritability was 0.08 (0.004) for susceptibility to clinical mastitis and 0.19 (0.007) for 305-d protein yield. The posterior mean (SD) of the genetic correlation between susceptibility to clinical mastitis and 305-d protein yield was 0.43 (0.03). Posterior means of the correlations between herd-5-yr effects, and between model residuals were 0.19 and –0.008, respectively. Corresponding estimates of genetic, herd-5-yr, and residual correlations from a bivariate linear model analysis were 0.42, 0.18, and –0.008, respectively. An antagonistic genetic relationship between clinical mastitis and protein yield was corroborated.
Key Words: Bayesian methods • clinical mastitis • genetic correlation • protein yield
Abbreviation key: CM = clinical mastitis, NRF = Norwegian Dairy Cattle, PY = protein yield.
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