Genetic parameters for Australian maternal and dual-purpose meatsheep breeds, 2. Liveweight, wool and reproduction in Corriedale sheep
1994
Brash, L.D. | Fogarty, N.M. | Gilmour, A.R. (New South Wales Agriculture, Orange (Australia). Agricultural Research and Veterinary Centre)
Performance of sheep from a large Corriedale stud flock was assessed. Weaning and yearling liveweights, greasy and clean fleece weights, clean fleece yield and average fibre diameter records on approximately 3000 animals representing 64 sires were analysed. Also scrotal circumference of 1009 rams representing 27 sires were analysed. Some 3740 reproduction records over 11 years, for 980 ewes representing 114 sires, were also analysed. The genetic correlations between liveweight and fleece weight ranged from 0.13 to 0.34, and those for liveweight and fibre diameter were close to zero. The genetic correlations of scrotal circumference with liveweight and wool traits were positive and moderate. Reproductive performance in the flock was high, with fertility 92 percent and litter size 1.62, resulting in 148 percent lambs born and 130 percent lambs tagged alive of ewes joined.
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