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Journal of Animal Science, Vol 72, Issue 6 1433-1440, Copyright © 1994 by American Society of Animal Science

JOURNAL ARTICLE

Selection response for growth in a Spanish Merino flock

J. J. Jurado, A. Alonso and R. Alenda
Departamento de Produccion Animal, CIT-INIA, Madrid, Spain.

Weight and growth data on 5,136 lambs, from 104 sires and 1,552 dams were collected during 5 yr (13 lambing seasons) of selection for high weaning weight in a single flock under range conditions. Ewes were culled based on fertility and replaced by ewe lambs selected for high weaning weight. Heritabilities of birth weight, weaning weight (30 d), preweaning daily gain, postweaning daily gain, and weight at 90 d, respectively, were .13, .09, .03, .15, and .11. Genetic correlations were generally high. Genetic and phenotypic improvements of weaning weight were 22 +/- 3.0 and 198 +/- 11.3 g per lambing season, respectively, with three lambing seasons per year. At the end of the experiment, phenotypic mean weaning weight was 2.4 kg higher than the initial values. Estimated and theoretical responses were similar in the sire population. At the 13th lambing season, average breeding value of 30-d weight of the ram population was 600 g higher than the mean initial breeding value in the base population. Projected average breeding value of the lamb population under random mating at the 23rd lambing season was equal to 404 g.


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K. J. Hanford, L. D. Van Vleck, and G. D. Snowder
Estimates of genetic parameters and genetic change for reproduction, weight, and wool characteristics of Targhee sheep
J Anim Sci, March 1, 2003; 81(3): 630 - 640.
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Copyright © 1994 by the American Society of Animal Science.