response to somatic cell count-based selection for mastitis resistance in a divergent selection experiment in sheep.a divergent selection experiment in sheep was implemented to study the consequences of log-transformed somatic cell score (scs)-based selection on resistance to natural intramammary infections. using dams and progeny-tested rams selected for extreme breeding values for scs, we created 2 groups of ewes with a strong divergence in scs of approximately 3 genetic standard deviations. a survey of 84 first-lactation ewes of both the high and low scs lines indicated favorable responses to scs-based sel ...200919233814
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