Asian-Australasian Journal of Animal Sciences

  • 제22권4호
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  • Pages.459-464
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  • 2009
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  • 1011-2367(pISSN)
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  • 1976-5517(eISSN)
아세아태평양축산학회 (Asian Australasian Association of Animal Production Societies)
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Genetic and Non-genetic Factors Affecting Mortality in Lori-Bakhtiari Lambs

  • Vatankhah, M. (Department of Animal Science, Agriculture and Natural Resources Research Center) ;
  • Talebi, M.A. (Department of Animal Science, Agriculture and Natural Resources Research Center)
  • 투고 : 2008.06.02
  • 심사 : 2008.12.08
  • 발행 : 2009.04.01
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초록

Data and pedigree information for Lori-Bakhtiari sheep used in this study were 6,239 records of lamb mortality from 246 sires and 1,721 dams, collected from 1989 through 2007 from a Lori-Bakhtiari flock at Shooli station in Shahrekord. The traits investigated were cumulative lamb mortality from birth up to 7 days, up to 14 days, up to 21 days, and up to 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 and 12 months of age. The models included fixed factors that had significant effects and random direct genetic, maternal genetic and maternal permanent environmental effects. Variance components were estimated using the restricted maximum likelihood procedure applying three animal models with and without maternal and common environmental effects. The overall mean of cumulative lamb mortality rate was 22.95% from birth to 1 year of age, while the overall mortality rate up to 3 and from 3 to 6 months of age was 6.14% and 12.76%, respectively. The mortality rate after 6 months of age declined as the lambs grew older. The age of dam had no important effect on lamb mortality. The type of birth was more important during the preweaning period than at later ages, and lamb mortality rate was higher in twins. The year of birth, month of birth and sex of lamb significantly (p${\leq}$0.01) affected the cumulative lamb mortality rate at all ages. The least square mean of mortality during the final one-third of the lambing period was higher than the first and middle onethird of the lambing period. Male lambs were found to be at a higher risk of mortality than females. Birth weight of the lamb had a highly significant (p${\leq}$0.01) effect on lamb mortality at all ages as a quadratic regression. Direct and maternal heritability estimates of lamb mortality ranged from 0.01 to 0.13 and 0.01 to 0.05, respectively. Direct heritability increased with age of lamb, while maternal effects (genetic and common environmental) were important in the preweaning period. These results indicate that lamb mortality can be reduced first through farm management practices and secondly by genetic selection. Both animal and maternal effects should be considered in breeding programmes for reducing lamb mortality at preweaning.

키워드

참고문헌

  1. Berhan, A. and J.Van Arendonk. 2006. Reproductive performance and mortality rate in Menz and Horro sheep following controlled breeding in Ethiopia. Small Rumin. Res. 63:297-303 https://doi.org/10.1016/j.smallrumres.2005.03.003
  2. Fogarty, N. M., G. E. Dickerson and L. D. Young. 1985. Lamb production and its components in pure breeds and composite lines. III. Genetic parameters. J. Anim. Sci. 60:40-57 https://doi.org/10.1016/S0301-6226(96)01418-2
  3. 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(3):101-143
  4. Gallivan, C. 1996. Breeding objectives and selection indexes for genetic improvement of Canadian sheep. Ph.D. Thesis. University of Guelph, p. 174
  5. Green, L. E. and K. L. Morgan. 1993. Mortality in early born, housed lambs in south-west England. Prev. Vet. Med. 17:251-261 https://doi.org/10.1016/0167-5877(93)90033-P
  6. Lopez-Villalobos, N. and D. J. Garrick. 1999. Genetic parameter estimates for survival in Romney sheep. Proc. N. Z. Soc. Anim. Prod. 58:121-124
  7. Mandal, A., H. Prasad, A. Kumar, R. Roy and N. Sharma. 2007. Factors associated with lamb mortalities in Muzaffarnagari sheep. Small Rumin. Res. 71:273-279 https://doi.org/10.1016/j.smallrumres.2006.07.010
  8. Meyer, K. 2006. WOMBAT- A program for mixed model analyses by restricted maximum likelihood. User notes, Animal Genetics and Breeding Unit, Armidale, p. 55
  9. Morris, C. A., S. M. Hickey and J. N. Clarke. 2000. Genetic and environmental factors affecting lamb survival at birth and through to weaning. NZ. J. Agric. Res. 43:515-524 https://doi.org/10.1080/00288233.2000.9513448
  10. Mukasa-Mugerwa, E., A. Lahlou-Kassi, D. Anindo, J. E. O. Rege, S. Tembely, M. Tobbo 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 Menze sheep in Ethiopia. Small Rumin. Res. 37:1-12 https://doi.org/10.1016/S0921-4488(99)00152-2
  11. Nash, M. L., L. L. Hungerford, T. G. Nash and G. M. Zinn. 1996. Risk factors for perinatal and postnatal mortality in lambs. Vet. Rec. 139:64-67 https://doi.org/10.1016/S0921-4488(96)00987-X
  12. Rashidi, A., M. Sheikhahmadi, J. Rostamzadeh and J. N. B. Shrestha. 2008. Genetic and phenotypic parameters estimates of body weight at different ages and yearling fleece weight in Markhoz goats. Asian-Aust. J. Anim. Sci. 21:1395-1403
  13. Safari, E., N. M. Fogarty and A. R. Gilmour. 2005. A review of genetic parameter estimates for wool, growth, meat and reproduction traits in sheep. Livest. Prod. Sci. 92:271-289 https://doi.org/10.1016/j.livprodsci.2004.09.003
  14. Sawalha, R. M., J. Conington, S. Brotherstone and B. Villanueva. 2007. Analysis of lamb survival of Scottish Blackface sheep. Anim. 1:151-157
  15. SAS. 1996. Release 6. 11, SAS Institute Inc., Cary, North Carolia, USA
  16. Smith, G. M. 1977. Factors affecting birth weight, dystocia and preweaning survival in sheep. J. Anim. Sci. 44: 745-753
  17. Snowder, G. D. and A. D. Knight. 1995. Breed effects on foster lamb and foster dam on lamb viability and growth. J. Anim. Sci. 73:1559-1566
  18. 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
  19. 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
  20. Vatankhah, M. 2005. Defining a proper breeding scheme for Lori-Bakhtiari sheep in village system. Ph.D. Thesis. University of Tehran, p. 207
  21. Yapi, C. V., W. J. Boylan and R. A. Robinson. 1990. Factors associated with causes of preweaning lamb mortality. Prev. Vet. Med. 10:145-152 https://doi.org/10.1016/0167-5877(90)90060-U
  22. Zhu, M. J., J. T. Ding, B. Liu, M. Yu, B. Fan, C. C. Li and S. H. Zhao. 2008. Estimation of genetic parameters for four reproduction component traits in two Chinese indigenous pig breeds. Asian-Aust. J. Anim. Sci. 21:1109-1115

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