J. Anim Sci.
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Bromley, C. M.
Right arrow Articles by Snowder, G. D.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Bromley, C. M.
Right arrow Articles by Snowder, G. D.

Journal of Animal Science, Vol 79, Issue 2 339-346, Copyright © 2001 by American Society of Animal Science

JOURNAL ARTICLE

Genetic correlations for litter weight weaned with growth, prolificacy, and wool traits in Columbia, Polypay, Rambouillet, and Targhee sheep

C. M. Bromley, L. D. Van Vleck and G. D. Snowder
Department of Animal Science, University of Nebraska, Lincoln 68583-0908, USA.

Total litter weight weaned at 120 d postpartum per ewe lambing is often believed to be a measure of range ewe productivity. Genetic correlations for litter weight weaned at 120 d with prolificacy, growth, and wool traits for Columbia, Polypay, Rambouillet, and Targhee sheep were estimated using REML with animal models. Observations per breed ranged from 5,140 to 7,083 for litter weight weaned, from 5,140 to 7,095 for prolificacy traits, from 7,750 to 9,530 for growth traits, and from 4,603 to 18,443 for wool traits. Heritability estimates for litter weight weaned were low and ranged from 0.02 to 0.11. Fraction of variance due to permanent environmental effects averaged 0.05 and, due to effects of mates, averaged 0.01. Estimates of genetic correlations with litter weight weaned varied from breed to breed. The ranges were as follows: 0.42 to 0.65 with litter size born, 0.80 to 0.99 with litter size weaned, -0.22 to 0.28 with birth weight, -0.07 to 0.23 with average daily gain to weaning, -0.56 to 0.19 with fleece weight, -0.15 to 0.02 with fleece grade, and -0.11 to 0.08 with staple length. Results suggest that, if selection were practiced on litter weight weaned, the average correlated responses would be expected to be favorable or neutral for prolificacy, growth, and wool traits although responses might vary from breed to breed.


This article has been cited by other articles:


Home page
 J ANIM SCIHome page
H. B. Vanimisetti, D. R. Notter, and L. A. Kuehn
Genetic (co)variance components for ewe productivity traits in Katahdin sheep
J Anim Sci, January 1, 2007; 85(1): 60 - 68.
[Abstract] [Full Text] [PDF]

Home page
 J ANIM SCIHome page
R. M. Sawalha, G. D. Snowder, J. F. Keown, and L. D. Van Vleck
Genetic relationship between milk score and litter weight for Targhee, Columbia, Rambouillet, and Polypay sheep
J Anim Sci, April 1, 2005; 83(4): 786 - 793.
[Abstract] [Full Text] [PDF]

Home page
 J ANIM SCIHome page
G. D. Snowder and L. D. Van Vleck
Estimates of genetic parameters and selection strategies to improve the economic efficiency of postweaning growth in lambs
J Anim Sci, November 1, 2003; 81(11): 2704 - 2713.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 2001 by the American Society of Animal Science.