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Department of Animal Science, Agricultural University of Norway, P.O. Box 5025, N-1432 Ås, Norway
Corresponding author: J. Ødegård; e-mail: jorgen.odegard{at}ihf.nlh.no.
Mean daughter deviations for clinical mastitis among second-crop daughters were regressed on predicted transmitting abilities for clinical mastitis and lactation mean somatic cell score in first-crop daughters to validate the predictive ability of these traits as selection criteria for reduced incidence of clinical mastitis. A total of 321 sires had 684,897 second-crop daughters, while predicted transmitting abilities were calculated for 2159 sires, based on 495,681 records of first-crop daughters. Predictive ability, as a measure of efficiency of selection, was 23 to 43% higher for clinical mastitis than for lactation mean somatic cell score. Compared to single-trait selection, predictive ability improved 8 to 13% from utilizing information on both traits. The relative weight that should be assigned to standardized predicted transmitting abilities from univariate genetic analyses were 60 to 67% for clinical mastitis and 33 to 40% for lactation mean somatic cell score. No significant nonlinear genetic relationship between the two traits was found.
Key Words: clinical mastitis • dairy cattle • selection • somatic cell score
Abbreviation key: CM = clinical mastitis, DYD = mean daughter deviation, LSCS = lactation mean SCS, NRF = Norwegian Cattle
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