Influence of body weight, age, and weight gain on fertility and prolificacy in four breeds of ewe lambs

Journal of Animal Science

Volumn 83, Issue 7, 2005, Pages 1680-1689

  Gaskins, C T ^a,c   Snowder, G D ^b   Westman, M K ^c   Evans, M ^a  

^a WASHINGTON STATE UNIVERSITY   (United States)

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

^c Dept of Anim Sci ^*  (United States)

Author keywords

Efficiency; Litter Size; Reproduction; Sheep

Indexed keywords

OVIS; OVIS ARIES;

EID: 33646053179     PISSN: 00218812     EISSN: None     Source Type: Journal    
DOI: 10.2527/2005.8371680x     Document Type: Article

References (25)

1. Allen, D. M., and G. E. Lamming. 1961. Some effects of nutrition on the growth and sexual development of ewe lambs. J. Agric. Sci. 57:87-95.
2. Baker, R. L., T. A. Steine, A. W. Våbenø, A. Bekken, and T. Gjedrem. 1978. Effect of mating ewe lambs on lifetime productive performance. Acta Agric. Scand. 28:203-207.
3. Bichard, M., A. A. Younis, P. A. Forrest, and P. H. Cumberland. 1974. Analysis of production records from a lowland sheep flock. 4. Factors influencing the incidence of successful pregnancy in young females. Anim. Prod. 19:177-191.
4. Bowman, J. C. 1966. Meat from sheep. Anim. Breed. Abstr. 34:293-319.
5. Burfening, P. J., J. L. Van Horn, and R. L. Blackwell. 1971. Genetic and phenotypic parameters including occurrence of estrus in Rambouillet ewe lambs. J. Anim. Sci. 33:919-922.
6. Cedillo, R. M., W. Hohenboken, and J. Drummond. 1977. Genetic and environmental effects on age at first estrus and on wool and lamb production of crossbred ewe lambs. J. Anim. Sci. 44:948-957.
7. Dickerson, G. E., and D. B. Laster. 1975. Breed, heterosis and environmental influences on growth and puberty in ewe lambs. J. Anim. Sci. 41:1-10.
8. Dýrmundsson, Ó. R. 1973. Puberty and early reproductive performance in sheep. I. Ewe lambs. Anim. Breed. Abstr. 41:273-289.
9. Dýrmundsson, Ó. R. 1981. Natural factors affecting puberty and reproductive performance in ewe lambs: A review. Livest. Prod. Sci. 8:55-65.
10. Ercanbrack, S. K., and A. D. Knight. 1985. Lifetime production of 1/4 and 1/2 Finnish Landrace ewes from Rambouillet, Targhee, and Columbia dams under range conditions. J. Anim. Sci. 61:66-77.
11. Hulet, C. V., E, L. Wiggins, and S. K. Ercanbrack. 1969. Estrus in range ewe lambs and its relationship to lifetime reproductive performance. J. Anim. Sci. 28:246-252.
12. Knight, A. D., and G. D. Snowder. 1995. Genetic alternatives addressing the economic impact of changes in public lands grazing policy and loss of the wool incentive program on intermountain range sheep production systems. Sheep Goat Res. J. 3:140-148.
13. Laster, D. B., H. A. Glimp, and G. E. Dickerson. 1972. Factors affecting reproduction in ewe lambs. J. Anim. Sci. 35:79-83.
14. Lewis, R. D., and P. J. Burfening. 1988. Comparison of Finnish Landrace crossbred ewes with Columbia, Rambouillet, and Targhee ewes on western range. J. Anim. Sci. 66:1059-1066.
15. Nawaz, M., H. H. Meyer, and D. R. Thomas. 1992. Performance of Polypay, Coopworth, and crossbred ewes: II. Survival and cumulative lamb and wool production over 4 years. J. Anim. Sci. 70:70-77.
16. Quirke, J. R., G. H. Stabenfeldt, and G. E. Bradford. 1985. Onset of puberty and duration of the breeding season in Suffolk, Rambouillet, Finnish Landrace, Dorset and Finn-Dorset ewe lambs. J. Anim. Sci. 60:1463-1471.
17. Perkins, A., J. A. Fitzgerald, and E. O. Price. 1992. Sexual performance of ram in serving capacity tests predicts success in pen breeding. J. Anim. Sci. 70:2722-2725.
18. Smith, J. F. 1985. Protein, energy and ovulation rate. Page 349 in Genetics of Reproduction in Sheep. R. B. Land and D. W. Robinson, ed. Butterworths, Boston, MA.
19. Snowder, G. D, 2002. Composite trait selection for improving lamb production. Sheep Goat Res. 17:42-49.
20. Snowder, G. D., and H. A. Glimp. 1991. Influence of breed, number of suckling lambs, and stage of lactation on ewe milk production and lamb growth under range conditions. J. Anim Sci. 69:923-930.
21. Snowder, G. D., and A. D. Knight. 1995. Breed effects of foster lamb and foster dam on lamb viability and growth. J. Anim Sci. 73:1559-1566.
22. Snowder, G. D., A. D. Knight, L. D. Van Vleck, C. M. Bromley, and T. R. Kellom. 2001a. Usefulness of subjective ovine milk scores: I. Associations with range ewe characteristics and lamb production. J. Anim Sci. 79:811-818.
23. Snowder, G. D., A. D. Knight, L. D. Van Vleck, C. M. Bromley, and T. R. Kellom. 2001b. Usefulness of subjective ovine milk scores: II. Genetic parameter estimates. J. Anim Sci. 79:869-876.
24. Southam, E. R., C. V. Hulet, and M. P. Botkin. 1971. Factors influencing reproduction in ewe lambs. J. Anim. Sci. 33:1282-1287.
25. Turner, H. N., G. H. Brown, and G. H. Ford. 1968. The influence of age structure on total productivity in breeding flocks of Merino sheep. 1. Flocks with a fixed number of breeding ewes, producing their own replacements. Aust. J. Agric. Res. 19:443-475.