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United States Department of Agriculture

Agricultural Research Service

Title: Parameter Estimates for Fleece Weight of Rambouillet Sheep at Different Ages

item Waldron, D. - TEXAS A&M UNIVERSITY
item Van Vleck, Lloyd

Submitted to: Journal of Animal Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: March 3, 2000
Publication Date: N/A

Interpretive Summary: Are fleece weights at 1 year of age controlled by the same genes as fleece weights at later ages? A quantitative answer to this question is contained in the genetic correlation between fleece weights of an animal's genotype at different ages. This study of about 1,500 fleece weights of Rambouillet ewes found genetic correlations among yearling, two and three year old, and dgreater than three year old fleece weights to be from .88 to .97. These correlations are large enough to conclude that fleece weights at different ages can be considered to be one and not different traits. Savings in computational costs for genetic evaluations would be substantial with little loss in genetic progress by using a repeated measures model rather than a multiple (age group) trait genetic model. These results confirm those previously found from USDA data for Rambouillet and from Australian data for Merino sheep.

Technical Abstract:

Last Modified: 7/31/2014
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