After 17 years of selection, responses in disease and production traits in lines of Merino sheep selected for increased (Susceptible line) and reduced (Resistant line) expression of body strike and fleece rot were estimated. The Susceptible and Resistant lines differed significantly in both natural and artificial expressions of fleece rot and body strike. The lines diverged at annual rates of 2.8% for natural fleece rot incidence and 0.4% for natural body strike incidence. Similar divergence rates were observed for the artificial expressions of these traits. Selection resulted in unfavourable correlated responses in greasy and clean fleece weights, a favourable correlated response in fibre diameter and little evidence of correlated responses in yield and body weight.

S. I Mortimer, Kevin D Atkins, H. W Raadsma

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 27: Reproduction; fish breeding; genetics and the environment; genetics in agricultural systems; disease resistance; animal welf, , 283–286, 1998
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