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Variation of mohair staple length across Angora goat fleeces: implications for animal selection and fleece evaluation

Published online by Cambridge University Press:  16 April 2009

B. A. McGREGOR  and
K. L. BUTLER
B. A. McGREGOR*
Affiliation:
Deakin University, Geelong, Australia
K. L. BUTLER
Affiliation:
Biometrics Group, Future Farming Systems, Department of Primary Industries, Werribee, Victoria, 3030, Australia
*
*To whom all correspondence should be addressed. Email: [email protected]
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Summary

The present study aimed to determine how the average mohair staple length (SL) differences between nine sampling sites vary between sex and flock, to identify differences in SL variability between sampling sites as a result of between-animal and between-sire variability and to determine SL correlations between sampling sites in between-animal and between-sire variability. Australian Angora goats (n=301) from two farms in southern Australia were sampled at 12 and 18 months of age at nine sites (mid side, belly, brisket, hind flank, hip, hock, mid back, neck and shoulder). Staples were taken prior to shearing at skin level and stretched SL determined. For each shearing, differences in SL between sampling sites, how these differences were affected by farm, sex and sire, and the covariance between sites for sire and individual animal effects were investigated by restricted maximum likelihood (REML) analyses. The median mid-side SL at 12 and 18 months of age was 110 and 130 mm, respectively, but the actual range in mid-side SL was 65–165 mm. There was an anterior–posterior decline in SL with the hock being particularly short. There was no evidence that the between-site correlation of the sire effects differed from 1, indicating that genetic selection for SL at one site will be reflected in SL over the whole fleece. However, low heritabilities of SL at the hock, belly and brisket or at any site at 12 months of age were obtained. There was more variability between sites than between sires, but the between-animal variation was greater. The hip and mid-back sites can be recommended for within-flock (culling) and genetic selection for SL due to their low sampling variability, moderate heritability and ease of location.

Type
Animals
Information
The Journal of Agricultural Science , Volume 147 , Issue 4 , August 2009 , pp. 493 - 501
Copyright
Copyright © Cambridge University Press 2009

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References

REFERENCES

Allain, D. & Roguet, J. M. (2003). Genetic and non-genetic factors influencing mohair production traits within the national selection scheme of Angora goats in France. Livestock Production Science 82, 129–137.CrossRefGoogle Scholar
Butler, K. & McGregor, B. (2006). GenStat REML analyses of sampling sites on Angora goats. In Proceedings of the Australasian GenStat/StatGen Conference, Victor Harbour, South Australia. http://www.vsni.co.uk/resources/events/wrapups/Butler_Kym.pdf (verified 4 March 2009).Google Scholar
Engdahl, G. R. & Bassett, J. W. (1971). Mohair variation on the Angora goat. Texas Agricultural Station Research Report PR-2934, 62 pp.Google Scholar
Ferguson, M. B. & McGregor, B. A. (2005). Selecting high performing Angoras. In RIRDC Research Report No 05-141. Barton, ACT: Rural Industries Research Development Corporation. https://rirdc.infoservices.com.au/downloads/05-141.pdf (verified 4 March 2009).Google Scholar
Gifford, D. R. (1989). A note on the variation in fleece characteristics over the body of Australian Angora bucks. Animal Production 48, 245–247.Google Scholar
Gifford, D. R., Ponzoni, R. W., Lampe, R. J. & Burr, J. (1991). Phenotypic and genetic parameters of fleece traits and live weight in South Australian Angora goats. Small Ruminant Research 4, 293–302.CrossRefGoogle Scholar
Gilmour, A. R., Thompson, R. & Cullis, B. R. (1995). Average Information REML, an efficient algorithm for variance parameter estimation in linear mixed models. Biometrics 51, 1440–1450.CrossRefGoogle Scholar
Hunter, L. (1993). Mohair: A Review of its Properties, Processing and Applications. Port Elizabeth, Australia: CSIR.Google Scholar
Leeder, J. D., McGregor, B. A. & Steadman, R. G. (1998). Properties and performance of goat fibre: A review and interpretation of existing research results. In RIRDC Research Paper No 98/22. Barton, ACT: Rural Industries Research Development Corporation. https://rirdc.infoservices.com.au/downloads/98-022.pdf (verified 4 March 2009).Google Scholar
Lockart, L. W. (1954). Sampling of fleeces for yield, staple length, and crimps per inch measurement. Australian Journal of Agricultural Research 5, 555–567.CrossRefGoogle Scholar
McGregor, B. A. & Butler, K. L. (2004). Contribution of objective and subjective attributes to the variation in commercial value of Australian mohair: implications for mohair production, genetic improvement, and mohair marketing. Australian Journal of Agricultural Research 55, 1283–1298.Google Scholar
McGregor, B. A. & Butler, K. L. (2008 a). Variation of mean fibre diameter across mohair fleeces: implications for within flock animal selection, genetic selection, fleece classing and objective sale lot building. Small Ruminant Research 75, 54–64.CrossRefGoogle Scholar
McGregor, B. A. & Butler, K. L. (2008 b). Frequency of shearing increases growth of fibre and changes objective and subjective attributes of Angora goat fleeces. Journal of Agricultural Science, Cambridge 146, 351–361.CrossRefGoogle Scholar
Payne, R. W. (2005). The Guide to GenStat®; Release 10. Part 2: Statistics. Rothamsted, UK: Lawes Agricultural Trust.Google Scholar
Shelton, M. & Bassett, J. W. (1970). Estimate of certain genetic parameters relating to Angora goats. In Texas Agricultural Station Research Report PR-2750, pp. 38–41.Google Scholar
Stapleton, D. L. (1976). Medullated fibre in the Australian Angora goat fleece. Proceedings of the Australian Society of Animal Production 11, 45–48.Google Scholar
Stapleton, D. L. (1978). Mohair production and seasonal variability in the fleece of the Australian Angora goat. Ph.D. Thesis, University of New England, Armidale, Australia.Google Scholar
Taddeo, H. R., Duga, L., Almeida, D., Willems, P. & Somlo, R. (2000). Variation of mohair quality over the body in Angora goats. Small Ruminant Research 36, 285–291.CrossRefGoogle ScholarPubMed
Turner, H. N., Hayman, R. H., Riches, J. H., Roberts, N. F. & Wilson, L. T. (1953). Physical definition of sheep and their fleece for breeding and husbandry studies. In Division of Animal Health and Production Report No. 4 (Series S. W.-2). Melbourne, Australia: Commonwealth Scientific and Industrial Research Organisation.Google Scholar
Venter, J. J. (1959). A study of mohair classing. South African Journal of Agricultural Science 2, 119–131.Google Scholar
Yalçin, B. C., Aritürk, E., Imeryüz, F., Sincer, N. & Müftüoglu, S. (1979). Genetic and environmental aspects of Angora goat production. 2. Phenotypic and genetic parameters for the important production traits. Istanbul University Veterinary Faculty Dergisi 5, 19–34.Google Scholar
Young, S. S. Y. & Chapman, R. E. (1957). Fleece characters and their influence on wool production per unit area of skin in Merino sheep. Australian Journal of Agricultural Research 9, 363–372.CrossRefGoogle Scholar