Genotype by environment interaction (G * E) for lactation average somatic cell count (LSCC) and clinical mastitis incidence (CM) in environments defined by protein production, LSCC, CM and herd size was studied for >200 000 first-parity Swedish Holstein cows using a random regression model. The clearest evidence of G * E was detected for LSCC in LSCC environments as significant genetic variation in slope of predicted reaction norms and low genetic correlations between average and deviating environments, indicating re-ranking of sires. G * E was also found for CM in LSCC environments, for LSCC in CM environments and for both traits in protein production environments. In practice, the detected G * E for LSCC in LSCC environments could affect the selection of bulls in the progeny testing program.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 25.10, 2006
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