Competing risks analysis of lamb mortality in a terminal sire composite population

Journal of Animal Science

Volumn 82, Issue 10, 2004, Pages 2892-2899

  Southey, B R ^a   Rodriguez Zas, S L ^a   Leymaster, K A ^b  

^a UNIVERSITY OF ILLINOIS AT URBANA CHAMPAIGN   (United States)

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

Author keywords

Heritability; Population Mortality; Sheep; Survival Analysis

Indexed keywords

ANIMALIA; OVIS ARIES;

EID: 4644356823     PISSN: 00218812     EISSN: None     Source Type: Journal    
DOI: 10.2527/2004.82102892x     Document Type: Article

References (42)

1. Alexander, G., D. Stevens, and L. R. Bradley. 1993. Effect of age and parity on maternal behaviour in single-bearing Merino ewes. Aust. J. Exp. Agric. 33:721-728.
2. Allison, P. D. 1997. Survival Analysis Using the SAS® System. A practical guide. 2nd ed. SAS Inst., Inc., Cary, NC.
3. American Sheep Industry Association. 2003. Sheep Production Handbook. 7th ed. ADS/Nightwing Publishing, Fort Collins, CO.
4. Atkins, K. D. 1980. Selection for skin folds and fertility. Proc. Aust. Soc. Anim. Prod. 13:174-176.
5. Begg, C. B., and R. Gray. 1984. Calculation of polychotomous logistic regression parameters using individualized regressions. Biometrika 71:11-18.
6. Bennett, G. L. 2001. Experimental selection for reduced calving difficulty: Estimated breeding value trends. J. Anim. Sci. 79(Suppl. 1):244. (Abstr.)
7. Cloete, S. W. P., and A. J. Scholtz. 1998. Lamb survival in relation to lambing and neonatal behaviour in medium wool Merino lines divergently selected for multiple rearing ability. Aust. J. Exp. Agric. 38:801-811.
8. Cloete, S. W. P., A. J. Scholtz, A. R. Gilmour, and J. J. Olivier. 2002. Genetic and environmental effects on lambing and neonatal behaviour of Dorper and SA Mutton Merino lambs. Live. Prod. Sci. 78:183-193.
9. Crowder, M. 2001. Classical competing risks. CRC Press, Boca Raton, FL.
10. Cundiff, L. V., K. E. Gregory, and R. M. Koch. 1982. Selection for increased survival from birth to weaning. Pages 310-337 in Proc. 2nd World Cong. Genet. Appl. Livest. Prod., Madrid, Spain.
11. Donnelly, F. B. 1982. A practical attempt to breed for better lamb survival. Proc. Aust. Soc. Anim. Prod. 14:30-32.
12. Doksum, K. A., and M. Gasko. 1990. On a correspondence between models in binary regression analysis and in survival analysis. Int. Stat. Rev. 58:243-252.
13. Dürr, J. W., H. G. Monardes, and R. I. Cue. 1999. Genetic analysis of herd life in Quebec Holsteins using Weibull models. J. Dairy Sci. 82:2503-2513.
14. Dürr, J. W., M. P. Schneider, H. G. Monardes, and R. I. Cue. 2002. Competing risks analysis of reasons for disposal in Quebec dairy herds. Proc. 7th World Cong. Genet. Appl. Livest. Prod., Montpellier, France. CD-ROM communication No. 01-27.
15. Fahrmeir, L., and G. Tutz. 1994. Multivariate statistical modelling based on generalized linear models. Springer-Verlag, New York.
16. Gama, L. T., G. E. Dickerson, L. D. Young, and K. A. Leymaster. 1991. Genetic and phenotypic variation in sources of preweaning lamb mortality. J. Anim. Sci. 69:2744-2753.
17. Gilmour, A. R., B. R. Cullis, S. J. Welham, and R. Thompson. 1999. Page 210 in ASREML Reference Manual. NSW Agriculture Biometric Bulletin No. 3. NSW Agriculture, Orange, Australia.
18. Haughey, K. G. 1983. Selective breeding for rearing ability as an aid to improving lamb survival. Aust. Vet. J. 60:361-363.
19. Hinch, G. N. 1997. Genetics of behaviour. Pages 353-374 in Genetics of Sheep. L. Piper and A. Ruvinsky, ed. CAB Int., Wallingford, Oxon, U.K.
20. Ingram, D. D., and J. C. Kleinman. 1989. Empirical comparisons of proportional hazards and logistic regression models. Stat. Med. 8:525-538.
21. Kachman, S. D., and R. L. Fernando. 2002. Analysis of generalized linear mixed models with Matvec. Proc. 7th World Cong. Genet. Appl. Livest. Prod., Montpellier, France. CD-ROM communication No. 28-04.
22. Kalbfleisch, J. D., and R. L. Prentice. 2002. The Statistical Analysis of Failure Time Data. 2nd ed. John Wiley and Sons, Hoboken, NJ.
23. Kilgour, R. J., and K. G. Haughey. 1993. Pelvic size of Merino ewes selected for lamb rearing ability is greater than that of unselected Merino ewes. Anim. Reprod. Sci. 31:237-242.
24. Knight, T. W., P. R. Lynch, D. R. H. Hall, and H.-U. P. Hockey. 1988. Identification of factors contributing to the improved lamb survival in Marshall Romney sheep. N. Z. J. Agric. Res. 31:259-271.
25. Leymaster, K. A. 1991. Straightbred comparison of a composite population and the Suffolk breed for performance traits of sheep. J. Anim. Sci. 69:993-999.
26. Lush, J. L., W. F. Lamoreux, and L. N. Hazel. 1948. The heritability of resistance to death in poultry. Poult. Sci. 27:375-388.
27. Misztal, I., D. Gianola, and J. L. Foulley. 1989. Computing aspects of nonlinear methods of sire evaluation for categorical data. J. Dairy Sci. 72:1557-1568.
28. Mousa, E., L. D. Van Vleck, and K. A. Leymaster. 1999. Genetic parameters for growth traits for a composite terminal sire breed of sheep. J. Anim. Sci. 77:1659-1665.
29. Mukasa-Mugerwa, E., A. Lahlou-Kassi, D. Anindo, J. E. Rege, S. Tembely, M. Tibbo, and R. L. Baker. 2000. Between and within breed variation in lamb survival and the risk factors associated with major causes of mortality in indigenous Horro and Menz sheep in Ethiopia. Small Rumin. Res. 37:1-12.
30. Nash, M. L., L. L. Hungerford, T. G. Nash, and G. M. Zinn. 1997. Risk factors for respiratory disease mortality in lambs. Small. Rumin. Res. 26:53-60.
31. Nguti, R., P. Janssen, G. J. Rowlands, J. O. Audho, and R. L. Baker. 2003. Survival of Red Maasai, Dorper and crossbred lambs in the sub-humid tropics. Anim. Sci. 76:3-17.
32. Robertson, A., and I. M. Lerner. 1949. The heritability of all-or-none traits: Variability in poultry. Genetics 34:395-411.
33. Roxström, A., and E. Strandberg. 2002. Genetic analysis of functional, fertility-, mastitis-, and production-determined length of productive life in Swedish dairy cattle. Live. Prod. Sci. 74:125-135.
34. Simpson, S. P., and J. Slee. 1998. The inheritance of non-response to noradrenaline in Scottish Blackface lambs. Genet. Res. 51:65-69.
35. Slee, J., G. Alexander, L. R. Bradley, N. Jackson, and D. Stevens. 1991. Genetic aspects of cold resistance in newborn Merino lambs. Aust. J. Exp. Agric. 31:175-182.
36. Slee, J., and S. P. Simpson. 1991. Description of the effects of a single gene which inhibits the normal metabolic response of newborn lambs to exogenous noradrenaline. Res. Vet. Sci. 51:34-39.
37. Slee, J., and A. W. Stott. 1986. Genetic selection for cold resistance in Scottish Blackface lambs. Anim. Prod. 43:397-404.
38. Southey, B. R., S. L. Rodriguez-Zas, and K. A. Leymaster. 2001. Survival analysis of lamb mortality in a terminal sire composite population. J. Anim. Sci. 79:2298-2306.
39. Southey, B. R., S. L. Rodriguez-Zas, and K. A. Leymaster. 2003. Discrete time survival analysis of lamb mortality in a terminal sire composite population. J. Anim. Sci. 81:1399-1405.
40. Vidal, S. M., D. Malo, K. Vogan, E. Skamene, and P. Gros. 1993. Natural resistance to infection with intracellular parasites: Identification of a candidate gene for Bcg. Cell 73:469-485.
41. Vukasinovic, N., J. Moll, and N. Künzi. 1999. Genetic evaluation for the length of productive life with censored records. J. Dairy Sci. 82:2178-2185.
42. Wolff, J. E., R. L. Baker, P. M. Dobbie, A. J. Ford, and R. B. Jordon. 1987. Genetic aspects of cold resistance in newborn lambs. Proc. N. Z. Soc. Anim. Prod. 47:93-98.