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Estimates of genetic and phenotypic parameters of some weight and fleece traits in a coarse-wool breed of sheep

Published online by Cambridge University Press:  27 March 2009

R. A. Guirgis ,
E. A. Afifi  and
E. S. E. Galal
R. A. Guirgis
Affiliation:
Department of Animal Production, Desert Institute, Matareya, Cairo, Egypt
E. A. Afifi
Affiliation:
Department of Animal Production, Desert Institute, Matareya, Cairo, Egypt
E. S. E. Galal
Affiliation:
Department of Animal Production, Desert Institute, Matareya, Cairo, Egypt
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Summary

A study using 1150 lambs to estimate genetic and phenotypic parameters of some weight and fleece traits was carried out on coarse-wool Barki sheep. The weight traits were birth, weaning, yearling weights and daily gains whereas fleece traits included kemp score, staple length and greasy-fleece weight.

Heritability estimates of weight traits were within the range 0·25–0·30. Those of fleece traits were 0·16, 0·21 and 0·43. The repeatability estimates of fleece traits were 0·18, 0·38 and 0·53 for staple length, greasy-fleece weight and kemp score respectively.

Phenotypic correlations between body weight and fleece traits were mostly positive. Genetic correlations between greasy-fleece weight and body weights were mostly positive and of medium values. Those between kemp score and body weights were mostly negative, ranging from medium-high to high.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 99 , Issue 2 , October 1982 , pp. 277 - 285
Copyright
Copyright © Cambridge University Press 1982

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References

Aboul-Naga, A. M. & Afifi, E. A. (1977). Environmental and genetic factors affecting wool production from sub-tropical coarse wool sheep. Journal of Agricultural Science, Cambridge 88, 443–447.CrossRefGoogle Scholar
Becker, W. A. (1975). Manual Procedures in Quantitative Oenetics. 2nd edn, Washington State University.Google Scholar
Bowman, J. C. & Broadbent, J. S. (1966). Genetic parameters of growth between birth and sixteen weeks in Down cross sheep. Animal Production 8, 129–135.Google Scholar
Brown, G. H., Turner, H. N., Young, S. S. Y. & Dolling, C. H. S. (1966). Vital statistics for an experimental flock of Merino sheep. III. Factors affecting fleece and body characteristics including the effect of age of ewe and its possible interactions with methods of selection. Australian Journal of Agricultural Research 17, 557–581.CrossRefGoogle Scholar
Burns, M. (1966). Merino birthcoat fibre types and their follicular origin. Journal of Agricultural Science, Cambridge 66, 155–173.CrossRefGoogle Scholar
Carter, R. C. & McClure, W. H. (1962). Heritability of growth rate and grade in Hampshire lambs. Journal of Animal Science 21, 970.Google Scholar
Chapman, R. E. (1960). The biology of the fleece. Ani. nal Research Laboratories Technical Paper No. 3. Commonwealth Scientific and Industrial Research Organization, Australia.Google Scholar
El-Tawil, E. A. (1965). Genetic and environmental factors of sheep under arid conditions. Ph. D. thesis, Iowa State University, Ames, U. S. A.Google Scholar
Fahmy, M. H., Galal, E. S. E., Ghanem, Y. S. & Khishin, S. S. (1969 a). Crossbreeding of sheep under semi-arid conditions. Animal Production 11, 351–360.Google Scholar
Fahmy, M. H., Galal, E. S. E., Ghanem, Y. S. & Khishin, S. S. (1969 b). Genetic parameters of Barki sheep raised under semi-arid conditions. Animal Production 11, 361–367.Google Scholar
Falconer, D. S. (1976). Introduction to Quantitative Oenetics. New York: The Ronald Press Company. 8th printing.Google Scholar
Ghanem, Y. S. (1965). Wool studies of crossbred Merino x Barki sheep under desert conditions. Bulletin de l'Institut Désert d'Egypt 15, 33–53.Google Scholar
Gjedrem, T. (1969). Phenotypic and genetic parameters for fleece weight and some wool quality traits. Acta Agriculturae Scandinavica 19, 103–115.CrossRefGoogle 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., El-Gabbas, H. M. H., Galal, E. S. E. & Ghoneim, K. E. (1979). Birthcoat-adult fleece relationship: a study of kemp succession in a coarse wool breed of sheep. Journal of Agricultural Science, Cambridge 92, 427–436.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
Hundley, W. S. & Carter, R. C. (1956). Heritability of growth rate and market grade in mutton lambs. Journal of Animal Science 14, 1126.Google Scholar
Kadry, A. E. (1971). Heritability and repeatability of some physical wool characteristics of Barki. M. Sc. thesis, Al-Azhar University, Cairo, Egypt.Google Scholar
Kassab, S. A. & Karam, H. A. (1961). Effect of some environmental factors on body and fleece weights of Barki sheep. Journal of Animal Production, United Arab Republic 1, 149–167.Google Scholar
Kempthorn, O. & Nordskog, A. W. (1959). Restricted selection indices. Biometrics 15, 10–19.CrossRefGoogle Scholar
MacNaughton, W. N. (1956). Repeatability and heritability of birth, weaning and shearling weights among range sheep in Canada. Ph. D. thesis, Iowa State University, Ames, U. S. A.Google Scholar
Madsen, M. A. & Chapman, A. B. (1960). Factors associated with wool production of range Columbia, Rambouillet and Targhee ewes. Journal of Animal Science 19, 1222.Google Scholar
Mullaney, P. D., Brown, C. H., Young, S. S. Y. & Hyland, P. G. (1969). Genetic and phenotypic parameters for wool characteristics in fine-wool Merino, Corriedale and Polwarth sheep. I. Influence of various factors on production. Australian Journal of Agricultural Research 20, 1161–1176.CrossRefGoogle Scholar
Osman, A. H. & Bradford, G. E. (1965). Effects of environment on pherotypic and genetic variation in sheep. Journal of Animal Science 24, 766–774.CrossRefGoogle ScholarPubMed
Purser, A. F. (1963). Current progress in three selection experiments with hill sheep. Genetics Today 3, 270.Google Scholar
Rae, A. L. (1958). Genetic variation and covariation in productive characters of New Zealand Romney Marsh sheep. New Zealand Journal of Agricultural Research 1, 104–123.Google Scholar
Ross, D. A. (1978). Carpet wools – carpet manufacture. Wool, Massey Agricultural University Wool Association, New Zealand.Google ScholarPubMed
Seoudy, A. M. (1966). Effect of crossing Merino and Barki sheep on some wool characteristics. M. Sc. thesis, Ain Shams University, Cairo, Egypt.Google Scholar
Slee, J. (1959). Fleece shedding, staple length and fleece weight in experimental Wiltshire Horn x Scottish Blackface sheep crosses. Journal of Agricultural Science, Cambridge 53, 209–223.CrossRefGoogle Scholar