Heritability and repeatability estimates for ewe productivity traits of three breeds under 8-month breeding cycles and artificial rearing of lambs

Small Ruminant Research

Volumn 24, Issue 3, 1997, Pages 185-194

  Hansen, C ^a   Shrestha, J N B ^a  

^a AGRICULTURE AND AGRI FOOD CANADA   (Canada)

Author keywords

Arcott breeds; Artificial rearing; Ewe productivity; Heritability; Repeatability

Indexed keywords

OVIS; OVIS ARIES;

EID: 0000542340     PISSN: 09214488     EISSN: None     Source Type: Journal    
DOI: 10.1016/s0921-4488(96)00952-2     Document Type: Article

References (33)

1. Abdulkhaliq, A.M., Harvey, W.R. and Parker, C.F., 1989. Genetic parameters for ewe productivity traits in the Columbia, Suffolk and Targhee breeds. J. Anim. Sci., 67: 3250-3257.
2. Clarke, S.E. and Hohenboken, W.D., 1983. Estimation of repeatability, heritability and breed differences for lamb production. J. Anim. Sci., 56: 309-315.
3. Dalton, D.C., 1962. Characters of economic importance in Welsh Mountain sheep. Anim. Prod., 4: 269-277.
4. Desai, R.N. and Winters, L.M., 1951. The inheritance of fertility in sheep. Indian J. Vet. Sci. Anim. Husb., 21: 191-196.
5. Demirören, E., Shrestha, J.N.B, and Boylan, W.J., 1995. Breed and environmental effects on components of ewe productivity in terms of multiple births, artificial rearing and 8-month breeding cycles. Small Rumin. Res., 16: 239-249.
6. Dickerson, G.E., 1969. Techniques for research in quantitative animal genetics. In: Techniques and Procedures in Animal Production Research. Monogr. Am. Soc. Anim. Sci. Q. Corporation, Albany, New York, pp. 36-79.
7. Eikje, E.D., 1975. Studies on sheep production records. VII. Genetic, phenotypic and environmental parameters for productivity traits of ewes. Acta Agric. Scand., 25: 242-252.
8. Ercanbrack, S.K., 1952. Selection indexes for range Rambouillet, Columbia and Targhee lambs. Unpublished Ph.D. Thesis, Iowa State University Library, Ames, IA.
9. Fahmy, M.H. and Shrestha, J.N.B., 1992. DLS and Arcott sheep: New Canadian breeds. Agric. Can. Res. Br., Tech. Bull. 31 pp.
10. Fogarty, N.M., 1995. Genetic parameters for live weight, fat and muscle measurements, wool production and reproduction in sheep: a review. Anim. Breed. Abstr. 63: 101-143.
11. Fogarty, N.M., Dickerson, G.E. and Young, L.D., 1982. Genetic parameters for reproduction in sheep. Proc. Aust. Soc. Anim. Prod., 14: 435-439.
12. Fogarty, N.M., Dickerson, G.E. and Young, L.D., 1985. Lamb production and its components in pure breeds and composite lines. III. Genetic parameters., J. Anim. Sci., 60: 40-57.
13. Forrest, P.A. and Bichard, M. 1974. Analysis of production records from a lowland sheep flock. 3. Phenotypic and genetic parameters for reproductive performance. Anim. Prod., 19: 33-45.
14. Hall, T.H., Ruttle, J.L. and Sidwell, G.H., 1964. Some genetic and phenotypic parameters of Navajo crossbred yearling ewes. J. Anim. Sci., 23: 485-489.
15. Heaney, D.P., Shrestha, J.N.B, and Peters, H.F., 1982. Performance of lambs fed milk replacers having two levels of fat. Can. J. Anim. Sci., 62: 837-843.
16. Hemmerle, W.J. and Hartley, H.O., 1973. Computing maximum likelihood estimates for the mixed AOV model using the W-transformation. Technometrics, 15: 819-831.
17. Henderson, C.R., 1953. Estimation of variance and covariance components. Biometrics, 9: 226-252.
18. Johansson, I. and Hansson, A., 1943. The sex ratio and multiple births in sheep. Lantbrukshoegsk. Ann., Uppsala, Sweden, 11: 145-171.
19. Kennedy, J.P., 1967. Genetic and phenotypic relationship between fertility and wool production in 2-year old Merino sheep. Aust. J. Agric. Res., 18: 515-522.
20. Long, I.E., Thomas, D.L., Fernando, R.L., Lewis, J.M., Garrigus, U.S. and Waldron, D.F., 1989. Estimation of individual and maternal heterosis, repeatability and heritability for ewe productivity and its components in Suffolk and Targhee sheep. J. Anim. Sci., 67: 1208-1217.
21. Martin, T.G., Nicholson, D., Smith, C. and Sales, D.I., 1981. Phenotypic and genetic parameters for reproductive performance in a synthetic line of sheep. J. Agric. Sci. (Cambridge), 96: 107-113.
22. Patterson, H.D. and Thompson, R., 1971. Recovery of inter-block information when block sizes are unequal. Biometrica, 58: 545-554.
23. Purser, A.F., 1965. Repeatability and heritabitity of fertility in hill sheep. Anim. Prod., 7: 75-82.
24. Razungles, J., Tchamitchian, L., Bibe, B., Lefevre, C., Brunel, J.C. and Ricordeau, G., 1985. The performance of Romanov crosses and their merits as a basis of selection. In: R.B. Land and D.W. Robinson (Editors), Genetics of Reproduction in Sheep, Butterworths, London, pp. 39-45.
25. Shelton, M. and Menzies, J.W., 1970. Repeatability and heritability of components of reproductive efficiency in fine wool sheep. J. Anim. Sci, 30: 1-5.
26. Shrestha, J.N.B, and Heaney, D.P., 1985. Genetic and phenotypic parameters of early growth traits of lambs reared artificially in a controlled environment. Can. J. Anim. Sci., 65: 37-49.
27. Shrestha, J.N.B. and Heaney, D.P., 1987. Genetic basis of variation in reproductive performance. I. Ewe lambs treated with Fluorogestone acetate and PMSG in a controlled environment, Anim. Reprod. Sci., 14: 281-291.
28. Shrestha, J.N.B., Heaney, D.P. and Parker, R.J., 1992. Productivity of three Synthetic Arcott sheep breeds and their crosses in terms of 8-month breeding cycle and artificially reared lambs. Small Rumin. Res., 9: 1-14.
29. Sidwell, G.M., 1956. Some aspects of twin versus single lambs of Navajo and Navajo crossbred ewes. J. Anim. Sci., 15: 202-210.
30. Terrill, C.E., 1962. Heritability estimates: farm animals, Part II: Sheep. In Growth Including Reproduction and Morphological Development. Fed. Am. Soc. Exp. Biol. Washington, DC, pp. 119-121.
31. Turner, H.N., 1969. Genetic improvement of reproduction rate in sheep. Anim. Breed. Abstr., 37: 545-563.
32. Turner, H.N., 1978. Selection for reproductive rate in Australian Merino sheep. Direct responses. Aust. J. Agric. Res., 29: 327-350.
33. Young, S.S.Y., Turner, H.N. and Dolling, C.H.S., 1963. Selection for fertility in Australian Merino sheep. Aust. J. Agric. Res., 14: 460-482.