Estimates of genetic parameters and genetic trend for reproduction, weight, and wool characteristics of Polypay sheep

Livestock Science

Volumn 102, Issue 1-2, 2006, Pages 72-82

  Hanford, K J ^a   Van Vleck, L D ^b   Snowder, G D ^c  

^a UNIVERSITY OF NEBRASKA LINCOLN   (United States)

^b U S MEAT ANIMAL RESEARCH CENTER   (United States)

^c AGRICULTURAL RESEARCH SERVICE   (United States)

Author keywords

Genetic correlation; Heritability; Litter size; Prolificacy; Weaning weight

Indexed keywords

OVIS ARIES;

EID: 33744947053     PISSN: 18711413     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.livsci.2005.11.002     Document Type: Article

References (23)

1. Al-Shorepy S.A., and Notter D.R. Genetic variation and covariation for ewe reproduction, lamb growth, and lamb scrotal circumference in a fall-lambing sheep flock. J. Anim. Sci. 74 (1996) 1490-1498
2. Boldman, K.G., Kriese, L.A., Van Vleck, L.D., Van Tassell, C.P., Kachman, S.D., 1995. A manual for the use of MTDFREML. A set of programs to obtain estimates of variances and covariances [DRAFT]. ARS-USDA, Clay Center, NE. 114 pp.
3. Bradford G.E., Sakul H., and Dally M.R. Selection for weaning weight or litter size in range sheep: II. Correlated responses and effect on productivity. Sheep Goat Res. J. 15 (1999) 138-146
4. Bromley C.M., Snowder G.D., and Van Vleck L.D. Genetic parameters among growth, prolificacy, and wool traits of Columbia, Polypay, Rambouillet, and Targhee sheep. J. Anim. Sci. 78 (2000) 846-858
5. Bromley C.M., Van Vleck L.D., and Snowder G.D. Genetic correlations for litter weight weaned with growth, prolificacy, and wool traits in Columbia, Polypay, Rambouillet, and Targhee sheep. J. Anim. Sci. 79 (2001) 339-346
6. Burfening P.J., Kachman S.D., Hanford K.J., and Rossi D. Selection for reproductive rate in Rambouillet sheep: estimated genetic change in reproductive rate. Small Rumin. Res. 10 (1993) 317-330
7. de Vries M.J., van der Waaij E.H., and van Arendonk J.A.M. Estimation of genetic parameters for litter size in sheep: a comparison of a repeatability and a multivariate model. Anim. Sci. 66 (1998) 685-688
8. Ercanbrack S.K., and Knight A.D. Responses to various selection protocols for lamb production in Rambouillet, Targhee, Columbia, and Polypay sheep. J. Anim. Sci. 76 (1998) 1311-1325
9. Fogarty N.M. Genetic parameters for live weight, fat and muscle measurements, wool production and reproduction in sheep: a review. Anim. Breed. Abstr. 63 (1995) 101-143
10. Graser H.-U., Smith S.P., and Tier B. A derivative-free approach for estimating variance components in animal models by restricted maximum likelihood. J. Anim. Sci. 64 (1987) 1362-1370
11. Hanford K.J., Van Vleck L.D., and Snowder G.D. Estimates of genetic parameters and genetic change for reproduction, weight, and wool characteristics of Columbia sheep. J. Anim. Sci. 80 (2002) 3086-3098
12. Hanford K.J., Van Vleck L.D., and Snowder G.D. Estimates of genetic parameters and genetic change for reproduction, weight, and wool characteristics of Targhee sheep. J. Anim. Sci. 81 (2003) 630-640
13. Hanford K.J., Van Vleck L.D., and Snowder G.D. Estimates of genetic parameters and genetic change for reproduction, weight, and wool characteristics of Rambouillet sheep. Small Rumin. Res. 57 (2005) 175-186
14. Hulet C.V., Ercanbrack S.K., and Knight A.D. Development of the Polypay breed of sheep. J. Anim. Sci. 58 (1984) 15-24
15. Jurado J.J., Alonso A., and Alenda R. Selection response for growth in a Spanish Merino flock. J. Anim. Sci. 72 (1994) 1433-1440
16. Okut H., Bromley C.M., Van Vleck L.D., and Snowder G.D. Genotypic expression at different ages: I. Prolificacy traits of sheep. J. Anim. Sci. 77 (1999) 2357-2365
17. Pohle E.M. Grading and production of wool. In: von Bergen W. (Ed). Wool Handbook (1963), John Wiley & Sons, New York 547-615
18. Saboulard M., Russell W.C., and Riley M.L. Selection for lambing rate and clean fleece weight in sheep. J. Anim. Sci. 73 (1995) 3195-3198
19. Safari A., and Fogarty N.M. Genetic Parameters for Sheep (2003), NSW Agriculture and Australian Sheep Industry CRC
20. Sakul H., Bradford G.E., and Dally M.R. Selection for litter size or weaning weight in range sheep: I. Selection practiced and direct response. Sheep Goat Res. J. 15 (1999) 126-137
21. Snowder G.D. Composite trait selection for improving lamb production. Sheep Goat Res. J. 17 (2002) 42-48
22. Snowder G.D., Knight A.D., Van Vleck L.D., and Bromley C.M. Usefulness of subjective ovine milk scores: I. Associations with range ewe characteristics and lamb production. J. Anim. Sci. 79 (2001) 811-818
23. Snowder G.D., Van Vleck L.D., Knight A.D., Kellom T.R., and Bromley C.M. Usefulness of subjective ovine milk scores: II. Genetic parameter estimates. J. Anim. Sci. 79 (2001) 869-876