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A study of some wool traits in two coarse wool breeds and their reciprocal crosses

Published online by Cambridge University Press:  27 March 2009

R. A. Guirgis ,
N. T. Kazzal ,
M. S. Haddadine  and
R. K. Abdallah
R. A. Guirgis
Affiliation:
Department of Animal Production, College of Agriculture and Forestry, Mosul University, Iraq
N. T. Kazzal
Affiliation:
Department of Animal Production, College of Agriculture and Forestry, Mosul University, Iraq
M. S. Haddadine
Affiliation:
Department of Animal Production, College of Agriculture and Forestry, Mosul University, Iraq
R. K. Abdallah
Affiliation:
Department of Animal Production, College of Agriculture and Forestry, Mosul University, Iraq
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Summary

In a study of two coarse wool breeds (Awassi and Karadi) and their reciprocal crosses, data were obtained on the mean fibre length, mean fibre diameter, fibre type ratio, medullation and on the effect of some environmental factors on these traits. Reciprocal crosses showed intermediate values, in growth rate of fibres, percentages of fibre types and medullation, between those of the parental breeds. Sex exhibited a significant effect at weaning only, on fibre length. Heterosis in fibre length, at the two ages, was small and negative. Maternal influence on fibre length was small and not significant. Fibre length in Karadi sheep showed the highest frequency of bimodal distribution whereas Awassi showed the lowest. Awassi × Karadi was closer to Karadi and Karadi × Awassi had greater affinity to Awassi in the frequency of samples showing bimodal distribution.

Reciprocal crosses had larger diameter, at weaning, than those of the parental breeds. At 1 year of age they assumed an intermediate position between the pure bred parents.

At weaning, the two reciprocal crosses showed a highly significant heterosis in fibre diameter; its value decreased with advancing age and it showed no significant effect at 1 year of age.

Maternal influence on fibre diameter was very small and not significant.

Karadi × Awassi and Karadi samples had the highest percentage of samples showing bimodal distribution of fibre diameter.

Samples with bimodal distribution of both length and diameter, indicating two coats, had the highest frequency in Karadi followed by Karadi × Awassi; Awassi showed the lowest value.

Percentages of fine, coarse and kemp fibres were significantly affected by breed and age of dam. Type of birth showed a significant effect only on percentage of coarse fibres.

Karadi wool might be more suitable for carpet manufacturing. It excelled the other groups in the bimodal distribution of both length and diameter as well as in medullation. Cross-breeding increased the bimodality of fibre distribution.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 90 , Issue 3 , June 1978 , pp. 495 - 501
Copyright
Copyright © Cambridge University Press 1978

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References

Anderson, S. L. (1955). A relative humidity correction to the results of determination of the diameter of wool fibres by the air flow method. Journal of the Textile Institute, Manchester 46, T675.Google Scholar
Awad, A. B., Ghoneim, K. E. & Ghanem, Y. S. (1973). Inheritance of wool characteristics in a cross between Merino and Barki sheep. I. Staple and fibre length, fibre strength and elongation and wool yield. Mesopotamia Journal of Agriculture 8, 63–76.Google Scholar
Burns, M. (1966). Merino birthcoat fibre types and their follicular origin. Journal of Agricultural Science, Cambridge 66, 155–73.CrossRefGoogle Scholar
Doney, J. M. (1959). Variation in fibre and staple length over the body of the sheep. Australian Journal of Agricultural Research 10, 299–304.CrossRefGoogle Scholar
Dry, F. W. (1955). The dominant N gene in New Zealand Romney sheep. Australian Journal of Agricultural Research 6, 725–69.CrossRefGoogle Scholar
Dunlop, A. A. & McMahon, P. R. (1974). The relative importance of source of variation in fibre diameter for Australian Merino sheep. Australian Journal of Agricultural Research 25, 167–81.CrossRefGoogle Scholar
Fahmy, M. H., Galal, E. S. E., Ghanem, Y. S. & Khishin, E. S. (1969). Crossbreeding of sheep under semi-arid conditions. Animal Production 11, 351–60.Google Scholar
Fraser, A. S. (1952). Growth of wool fibres in sheep. Australian Journal of Agricultural Research 3, 419–34.CrossRefGoogle Scholar
Galal, E. S. E., Aboul-Naga, A., Eltawil, E. A. & Khishin, E. S. (1972). Estimates of combining abilities and maternal influence in crosses between Merino, Ossimi and Barki sheep. Animal Production 15, 47–52.Google Scholar
Guirgis, R. A. (1973). The study of variability in some wool traits in a coarse wool breed of sheep. Journal of Agricultural Science, Cambridge 80, 233–38.CrossRefGoogle Scholar
Hunter, G. L. (1956). The maternal influence on size in sheep. Journal of Agricultural Science, Cambridge 48, 36–61.CrossRefGoogle Scholar
Narayan, S. (1951). Studies in the wool quality of Pattanwadi sheep. Indian Journal of Veterinary Science 21, 43.Google Scholar
Nash, C. E. (1964). The assessment of N-type fleeces. Journal of the Textile Institute, Manchester 55, T299–T323.Google Scholar
Pilkington, J. M. & Purser, A. F. (1958). Fibre medullation in Blackface lambs and hoggs. Journal of Agricultural Science, Cambridge 51, 257–64.CrossRefGoogle Scholar
Robison, O. W. (1972). The role of maternal effects in animal breeding. V. Maternal effects in swine. Journal of Animal Science 35, 1303–15.Google Scholar
Ryder, M. L. & Stephenson, S. K. (1968). Wool Growth. London: Academic Press.Google Scholar
Schinckel, P. G. (1961). Mitotic activity in wool follicle bulb. Australian Journal of Biological Science 14, 659–76.Google Scholar
Shepherd, P. R. (1959). Woollen spinning for the carpet industry. Wool Technology and Sheep Breeding 6, 19–25.Google Scholar
Short, B. F. (1958). A dominant felting lustre mutant fleece-type in Australian Merino sheep. Nature, London 181, 1414–15.CrossRefGoogle ScholarPubMed
Snedecor, G. W. (1962). Statistical Methods. Ames, Iowa: Iowa State University Press.Google Scholar
Turner, H. N. & Young, S. S. Y. (1969). Quantitative Genetics in Sheep Breeding. Melbourne: MacMillan.Google Scholar
Von Bergen, W. (1963). What the manufacturer requires in raw wool. Wool Technology and Sheep Breeding 10, 43–9.Google Scholar
Wagner, R. P. (1972). The role of maternal effects in animal breeding. II. mitochondria and animal inheritance. Journal of Animal Science 35, 1280–7.CrossRefGoogle ScholarPubMed
Wiener, G. & Slee, J. (1965). Maternal and genetic influences on follicle and fleece development in Lincoln and Welsh Mountain sheep. A study involving egg transfer. Animal Production 7, 333–47.Google Scholar