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Response to the use of Merino in improvement of coarse-wool Barki sheep: an analysis of some cross-bred wool traits

Published online by Cambridge University Press:  27 March 2009

R. A. Guirgis
R. A. Guirgis
Affiliation:
Department of Animal Production, Desert Institute, Matareya, Cairo, Egypt
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Summary

A study was carried out during three successive years from 1970 to 1972 on different wool types. Breed groups involved were Merino (M), coarse-wool Barki sheep and five of their crosses. Traits studied were greasy-fleece weight, clean-fleece weight, kemp score and means of staple length and fibre diameter in the whole fleece.

The heaviest greasy fleeces were produced by ¾ followed by ⅝ M. Total average greasy fleece weight of the crosses was 3·43 kg. There was a general trend of increase in greasy fleece weight with increasing Merino proportion.

The total average percentage clean yield of the crosses was 42·2, and ½ M and ¾ M produced the heaviest clean fleeces. The total average clean fleece weight of the crosses was 1·44 kg. Skirting the fleeces caused a reduction in the within-fleece variability of staple length and diameter. Percentages reduction for staple length were 10·3, 9·6 and 14·6 and those for fibre diameter were 2·4, 5·0 and 9·5 in Barki, crosses and Merino respectively.

Barki had the coarsest diameter and the whole fleece of ¾ M showed the finest mean diameter of the crosses. The within-staple variability in distribution of fibre diameter was high in Barki and throughout the crosses. The average percentage medullated fibres was highest in Barki and decreased throughout the series of crosses. The ¼ M had the highest frequency medullated fibres of the crosses.

The longest mean staple in the crosses was produced by ¼ M. The within-fleece variability in staple length was generally low. In the crosses, the variability assumed slightly higher values than those of the parental breeds.

Kemp production was mainly contributed from the dorsal line, particularly from the back and hip.

As regards some wool and mutton characteristics, ⅝ M might be considered the most suitable cross-bred type.

With increasing Merino contribution in the crosses, the mean fibre diameter showed a decreasing trend, but a high within-staple variability was maintained throughout the crosses. Inter se mating, in most of the crosses, produced animals that showed relatively more uniformity between fleeces than either both or one of the crosses. Inter se mating of the different cross-bred types with selection of the desired uniformity in length and diameter would be recommended.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 95 , Issue 2 , October 1980 , pp. 339 - 347
Copyright
Copyright © Cambridge University Press 1980

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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, T 675.Google Scholar
Australian Wool Board (1972). Objective Measurement of Wool in Australia. Melbourne, Victoria, Australia: Australian Wool Corporation.Google Scholar
Bedeir, N. Z. (1978). Studies in ewe productivity under semi arid conditions. M.Sc. thesis, Ain-Shams University, Cairo.Google Scholar
Burns, M. (1955). Observations on Merino × Herdwick hybrid sheep with special reference to the fleece. Journal of Agricultural Science, Cambridge 46, 389–406.CrossRefGoogle Scholar
Burns, M. (1966). Merino birthcoat fibre types and their follicular origin. Journal of Agricultural Science Cambridge 66, 155–173.CrossRefGoogle Scholar
Burns, M. (1967 a). The Katsina wool project. I. The coat and skin histology of some Northern Nigerian hair sheep and their Merino crosses. Tropical Agriculture, Trinidad 44, 173–192.Google Scholar
Burns, M. (1967 b). The Katsina wool project. II. Coat and skin data from ¾ Merino and Wensleydale crosses. Tropical Agriculture, Trinidad 44, 253–274.Google Scholar
Chapman, R. E. (1960). The biology of the fleece. Animal Research Laboratories Technical Paper no. 3. Commonwealth Scientific and Industrial Research Organization, Australia.Google Scholar
Downie, N. M. & Heath, R. W. (1959). Basic Statistical Methods. New York: Harper and Brothers.Google Scholar
Dry, F. W. (1965). Lamb fibre types. In Biology of the Skin and Hair Growth (ed. Lyne, A. G. and Short, B. F.), pp. 89–104. Sydney: Angus and Robertson.Google Scholar
Fahmy, M. H., Galal, E. S. E., Ghanem, Y. S. & Khishin, S. S. (1969). Crossbreeding of sheep under semi-arid conditions. Animal Production 11, 351–360.Google Scholar
Grandstaff, O. J. & Wolf, W. H. (1947). Relation of kemp and other medullated fibres to age in the fleeces of Navajo and cross-bred lambs. Journal of Animal Science 6, 133–140.CrossRefGoogle Scholar
Guirgis, R. A. (1967). Fibre-type arrays and kemp succession in sheep. Journal of Agricultural Science, Cambridge 68, 75–85.CrossRefGoogle Scholar
Guirgis, R. A. (1973). Staple length and kemp as a basis of grading Barki wool. Alexandria Journal of Agricultural Research 21, 235–240.Google Scholar
Guirgis, R. A. (1977). Crossing Merino and a coarse wool breed of sheep; a study of the birthcoat of lambs. Journal of Agricultural Science, Cambridge 88, 375–380.CrossRefGoogle Scholar
Guirgis, R. A. & Galal, E. S. E. (1972). The association between kemp and some vigour and wool characteristics in Barki and Merino Barki cross. Journal of Agricultural Science, Cambridge 78, 345–349.CrossRefGoogle Scholar
Harvey, W. R. (1960). Least-squares Analysis of Data with Unequal Subclass Numbers. Agriculture Research Service 20–8. United States Department of Agriculture.Google Scholar
International Wool Textile Organization – 19 – 71 (E) (1971). Method for the Determination of the J.W.T.O. Clean Wool Content in Greasy Wool. The International Wool Secretariat Research Department, Wool House, Carlton Gardens, London S.W.I.Google Scholar
Ryder, M. L. (1978). The fleece of Wiltshire × Wensleydale sheep. Animal Production 26, 325–329.Google Scholar
Ryder, M. L. & Stephenson, S. K. (1968). Wool Growth. London: Academic Press.Google Scholar
Snedecor, G. W. & Cochran, W. G. (1970). Statistical Methods. Ames: Iowa State University Press.Google Scholar
Turner, H. N. (1959). Ratios as criteria for selection in animal or plant breeding, with particular reference to efficiency of food conversion in sheep. Australian Journal of Agricultural Research 10, 565–580.CrossRefGoogle Scholar
Turner, H. N. (1977). Australian sheep breeding research. Animal Breeding Abstracts 45, 9–31.Google Scholar
Von Bergen, W. (1963). What the manufacturer requires in raw wool. Wool Technology and Sheep Breeding 10, 43–49.Google Scholar