Genetic parameters for indicators of host resistance to parasites from weaning to hogget age in Merino sheep

Journal of Animal Science

Volumn 82, Issue 10, 2004, Pages 2852-2864

  Pollott, G E ^a,d   Karlsson, L J E ^b,c   Eady, S ^c,d   Greefft, J C ^b,d  

^a IMPERIAL COLLEGE LONDON   (United Kingdom)

^b Gt S Agric Research Institute   (Australia)

^c CSIRO   (Australia)

^d Australian Sheep Industry CRC   (Australia)

Author keywords

Body Weight; Fecal Egg Count; Gastrointestinal Parasites; Genetic Parameters; Random Regression; Sheep

Indexed keywords

ANIMALIA; OVIS ARIES;

EID: 4644235982     PISSN: 00218812     EISSN: None     Source Type: Journal    
DOI: 10.2527/2004.82102852x     Document Type: Article

References (32)

1. Baker, R. L., T. G. Watson, S. A. Bisset, A. Vlassoff, and P. G. C. Douch. 1991. Breeding sheep in New Zealand for resistance to internal parasites: Research results and commercial application. Pages 19-32 in Breeding for Disease Resistant Sheep. G. D. Gray, and R. R. Woolaston, ed. Australian Wool Corp., Melbourne.
2. Bishop, S. C., K. Bairden, Q. Q. McKellar, M. Park, and M. J. Stear. 1996. Genetic parameters for fecal egg count following mixed, natural, predominantly Ostertagia cicumcinta infection and relationships with liveweight gain of young lambs. Anim. Sci. 63:423-428.
3. Bisset, S. A., A. Vlassoff, C. A. Morris, B. R. Southey, R. L. Baker, and A. G. H. Parker. 1992. Heritability of and genetic correlations among fecal egg counts and productivity traits in Romney sheep. N. Z. J. Agric. Res. 35:51-58.
4. Bisset, S. A., C. A. Morris, D. R. Squire, S. M. Hickey, and M. Wheeler. 1994. Genetics of resilience to nematode parasites in Romney sheep. N. Z. J. Agric. Res. 37:521-534.
5. Bisset, S. A., C. A. Morris, D. R. Squire, and S. M. Hickey. 1996. Genetics of resilience to nematode parasites in young Romney sheep - Use of weight gain under challenge to assess individual anthelmintic treatment requirements. N. Z. J. Agric. Res. 39:314-323.
6. Clarke, B. 2002. Review of genetic parameters for Australian Merino sheep. Report to Meat and Livestock Australia. Project No. SHGEN.005. Dept. of Agric. Western Australia, Perth.
7. Gilmour, A. R., B. J. Gogel, B. R. Cullis, S. J. Welham, and R. Thompson. 2002. ASReml Users Guide Release 1.0 VSN Int., Ltd., Hemel Hempstead, U.K.
8. Greeff, J. C., and L. J. E. Karlsson. 1997. Genetic relationships between fecal egg count and scouring in Merino sheep. Proc. Assoc. Adv. Anim. Breed. Genet. 12:333-337.
9. Greeff, J. C., and L. J. E. Karlsson. 1998. The genetic relationship between fecal consistency, fecal worm egg counts and wool traits in Merino sheep. Pages 63-66 in Proc. 6th World Cong. Genet. Appl. Livest. Prod., NSW, Australia.
10. Greeff, J. C., and L. J. E. Karlsson. 1999. Will selection for decrease fecal worm egg count result in an increase in scouring? Proc. Assoc. Adv. Anim. Breed. Genet. 13:508-511.
11. Greeff, J. C., L. J. E. Karlsson, and J. F. Harris. 1995. Heritability of fecal worm egg count at different times of the year in a mediterranean environment. Proc. Assoc. Adv. Anim. Breed. Genet. 11:117-121.
12. Greeff, J. C., L. J. E. Karlsson, and R. B. Besier. 1999. Breeding sheep for resistance for internal parasites. Proc. Assoc. Adv. Anim. Breed. Genet. 13:150-155.
13. Karlsson, L. J. E., and J. C. Greeff. 1996. Preliminary genetic parameters of fecal worm egg count and scouring traits in Merino sheep selected for low worm egg count in a Mediterranean environment. Proc. Aust. Soc. Anim. Prod. 21:477.
14. Kolmodin, R., E. Strandberg, P. Madsen, J. Jensen, and H. Jorjani. 2002. Genotype by environment interaction in Nordic dairy cattle studied using reaction norms. Acta Agric. Scand. Sect. A. 52:11-24.
15. Larsen, J. W. A., N. Anderson, A. L. Vizard, G. A. Anderson, and H. Hoste. 1994. Diarrhoea in Merino ewes during winter: Association with Trichostrongylid larvae. Aust. Vet. J. 71:365-372.
16. Larsen, J. W. A., A. L. Vizard, J. K. Webb Ware, and N. Anderson. 1995. Diarrhoea due to trichostrongylid larvae in Merino sheep: Repeatability and differences between bloodlines. Aust. Vet. J. 72:196-197.
17. Maniatis, N., and G. E. Pollott. 2002. Direct and maternal (co)variances for weight and ultrasonically measured traits of lambs in a closed Suffolk flock. Small Rumin. Res. 45:235-246.
18. McEwan, J. C., P. Mason, R. L. Baker, J. N. Clarke, S. M. Hickey, and K. Turner. 1992. Effect of selection for productive traits on internal parasite resistance in sheep. Proc. N. Z. Soc. Anim. Prod. 52:53-56.
19. McEwan, J. C., S. A. Bisset, and C. A. Morris. 1997. The selection of sheep for natural resistance to internal parasites. Pages 161-182 in Sustainable Control of Internal Parasites in Ruminants. G. K. Barrell, ed. Lincoln Univ., Canterbury, New Zealand.
20. Meyer, H. H., T. G. Harvey, and J. E. Smeaton. 1983. Genetic variation in incidence of daggy sheep - an indicator of genetic resistance to parasites? Proc. N. Z. Soc. Anim. Prod. 43:87-89.
21. Morris, C. A. 1998. Responses to selection for disease resistance in sheep and cattle in New Zealand and Australia. Proc. 6th World Cong. Genet. Appl. Livest. Prod. Armidale, NSW, Australia. 27:295-302.
22. Morris, C. A., S. A. Bisset, A. Vlassoff, R. L. Baker, T. G. Watson, and M. Wheeler. 1997a. Yearling and ewe fleece weights in Romney and Perendale flocks selected for divergence in fecal nematode egg count. Proc. Assoc. Adv. Anim. Breed. Genet. 12:50-53.
23. Morris, C. A., S. A. Bisset, A. Vlassoff, C. I. West, and M. Wheeler. 2004. Genetic parameters for Nematodirus spp. egg counts in Romney lambs in New Zealand. Anim. Sci. 79:33-39.
24. Morris, C. A., A. Vlassoff, S. A. Bisset, R. L. Baker, C. J. West, and A. P. Hurford. 1997b. Responses of Romney sheep to selection for resistance or susceptibility to nematode infection. Anim. Sci. 64:319-329.
25. Morris, C. A., A. Vlassoff, S. A. Bisset, R. L. Baker, T. G. Watson, C. J. West, and M. Wheeler. 2000. Continued selection of Romney sheep for resistance or susceptibility to nematode infection: Estimates of direct and correlated responses. Anim. Sci. 70:17-27.
26. Pollott, G. E., and J. C. Greeff. 2004a. Genetic relationships between fecal egg count and production traits in commercial Merino sheep flocks. Anim. Sci. 79:21-32.
27. Pollott, G. E., and J. C. Greeff. 2004b. Genotype x environment interactions and genetic parameters for fecal egg count and production traits of Merino sheep kept in a range of environments. J. Anim. Sci. 82:2840-2851.
28. Safari, A., and N. M. Fogarty. 2003. Genetic parameters for sheep production traits: Estimates from the literature. Tech. Bull. 49, NSW Agric., Orange, Australia.
29. 1, fecal egg count and BW traits in grazing Romney lambs. Livest. Prod. Sci. 58:25-32.
30. Watson, T. G., R. L. Baker, and T. G. Harvey. 1986. Genetic variation in resistance or tolerance to internal nematode parasites in strains of sheep at Rotomahana. Proc. N. Z. Soc. Anim. Prod. 46:23-26.
31. Whitlock, H. V. 1948. Some modifications of the McMaster helminth egg-counting technique and apparatus. J. Council Sci. Ind. Res. 21:177-180.
32. Woolaston, R. R., and L. R. Piper. 1996. Selecting Merino sheep for resistance to Haemonchus contortus: Genetic variation. Anim. Prod. 62:451-460.