Hostname: page-component-586b7cd67f-tf8b9 Total loading time: 0 Render date: 2024-11-22T06:29:21.687Z Has data issue: false hasContentIssue false
  • English
  • Français

Seasonality in wool growth under semi-arid conditions

Published online by Cambridge University Press:  27 March 2009

A. A. Elsherbiny  and
B. Markotić
A. A. Elsherbiny
Affiliation:
Animal Production Research Station, Sakha, Kafrelsheikh, Egypt
B. Markotić
Affiliation:
Animal Production Research Station, Sakha, Kafrelsheikh, Egypt
Get access Rights & Permissions [Opens in a new window]

Summary

Wool samples from 49 ewes representing four breeds of sheep, Ossimi, Rahmani, Barki and Merino were used to study the seasonal variation in wool growth. The first three breeds are of the local carpet-wool types of Egypt.

Consistent differences were found between breeds in diameter and length of fibres (i.e. genetic effects). These effects were not modified by the environment (i.e. time of year) although the latter had different effects on diameter than on length. Medullation, however, was not consistent from breed to breed in all seasons (i.e. there was genotype x environment interaction). It is concluded that seasonality in wool growth exists under the semi-arid conditions of Egypt in local breeds but to a lesser extent in imported Merino sheep.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 83 , Issue 3 , December 1974 , pp. 443 - 446
Copyright
Copyright © Cambridge University Press 1974

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Bahasin, N. R. & Desai, R. N. (1965). Studies on factors affecting the characters concerning quality of wool fibre in a Chokla flock of sheep. Indian Veterinary Journal 42, 782–8.Google Scholar
Burns, M. (1953). Observations on the follicle population of Blackface sheep. Journal of Agricultural Science, Cambridge 43, 422–31.CrossRefGoogle Scholar
Coop, I. E. (1953). Wool growth as affected by nutritional and climatic factors. Journal of Agricultural Science, Cambridge 43, 456–72.CrossRefGoogle Scholar
Coop, I. E. & Hart, D. S. (1953). Environmental factors affecting wool growth. Proceedings of the New Zealand Society of Animal Production 13, 113–19.Google Scholar
Doney, J. M. (1966). Breed differences in response of wool growth to annual nutritional and climatic cycles. Journal of Agricultural Science, Cambridge 67, 25–30.CrossRefGoogle Scholar
Doney, J. M. & Smith, W. F. (1961). The fleece of the Scottish Blackface sheep. I. Seasonal changes in wool production and fleece structure. Journal of Agricultural Science, Cambridge 56, 365–74.CrossRefGoogle Scholar
Harrison, I. R. & Johnson, C. A. (1961). The depletion of insecticides on sheep fleece. Annals of Applied Biology 49, 588–600.CrossRefGoogle Scholar
Hart, D. S. (1961). The effect of light-dark sequence on wool growth. Journal of Agricultural Science, Cambridge 56, 235–42.CrossRefGoogle Scholar
Hutchinson, J. C. D. (1965). Photoperiodic control of the annual rhythm of wool growth. In Biology of the skin and Hair Growth (ed. Lyne, A. G. and Short, B.F.), pp. 565–74. Sydney: Angus and Robertson.Google Scholar
I.W.T.O. (1952). Measurement of wool fibre length. Wool Science Review, No. 9.Google Scholar
I.W.T.O. (1961). Method of determining wool fibre diameter by the projection microscope. International Wool Secretariat Research Department, Carlton Gardens, London, S.W.I.Google Scholar
I.W.T.O. (1964). Method of test for determining the percentage of medullated fibres by the projection microscope. International Wool Secretariat Research Department, Carlton Gardens, London, S.W. I.Google Scholar
Johnstone, I. L. (1955). Pasture improvement and wool production. Wool Technology 2, 83–7.Google Scholar
Lindner, H. R. & Ferguson, K. A. (1956). Influence of the adrenal cortex on wool growth and its relation to ‘break’ and ‘tenderness’ of the fleece. Nature, London 177, 188–89.CrossRefGoogle Scholar
Lyne, A. G. (1964). Effect of adverse nutrition on the skin of wool follicles in Merino sheep. Australian Journal of Agriculture Research 15, 788–801.CrossRefGoogle Scholar
Morris, L. R. (1961). Photoperiodicity of seasonal rhythm of wool growth in sheep. Nature, London 190, 102–3.CrossRefGoogle ScholarPubMed
Nagarcenkar, R. (1963). Shedding of fibres in sheep. Naturwissenshaften 50, 162–163.Google Scholar
Roe, R.Southcott, W. H. & Turner, H. N. (1959). Grazing management of native pasture in the New England Region of New South Wales. I. Pasture and sheep production with special reference to grazing and internal parasites. Australian Journal of Agriculture Research 10, 530–54.Google Scholar
Ross, D. A. (1965). Wool growth in New Zealand Romney. New Zealand Journal of Agriculture Research 8, 585–601.Google Scholar
Rougeot, J. (1961). Comparative effects of annual and semi-annual periodic variations of day length on the follicle cycles of the short kemp fibres of the fleece of Limousine ewes. Relationship with reproductive cycles. Annals of Biology and Animal Biochemistry and Biophysics 1, 385–402.CrossRefGoogle Scholar
Ryder, M. L. (1956). Observations on nutritional and seasonal changes in the fleeces of some Masham sheep. Journal of Agricultural Science, Cambridge 47, 129–44.Google Scholar
Ryder, M. L. (1971a). Wool growth cycles in Soay sheep. Journal of Agricultural Science, Cambridge 76, 183–97.CrossRefGoogle Scholar
Ryder, M. L. (1971b). Cycles of wool follicle activity in some Shetland sheep. Animal Production 13, 511–20.Google Scholar
Ryder, M. L. & Stephenson, S. K. (1968). In Wool Growth, pp. 593–625. London: Academic Press.Google Scholar
Sleb, J. & Carter, H. B. (1961). A comparative study of fleece growth in Tasmanian Merino and Wiltshire Horn ewes. Journal of Agricultural Science, Cambridge 57, 11–19.Google Scholar
Slee, J. & Ryder, M. L. (1967). The effect of acute cold exposure on wool growth in Scottish Blackface and Merino x Cheviot sheep. Journal of Agricultural Science, Cambridge 69, 449–53.CrossRefGoogle Scholar
Snedecor, G. W. & Cochran, W. G. (1962). Statistical Methods, 5th edn, 3rd repr., pp. 237–90. Ames, Iowa, U.S.A.: Iowa State University Press.Google Scholar
Story, L. F. & Ross, D. A. (1960). Effect of shearing time on wool growth. VI. The rate of growth of wool and its relation to time of shearing. New Zealand Journal of Agriculture Research 9, 113–24.CrossRefGoogle Scholar
Thwaites, C. J. (1972). The effects of short term undernutrition and adrenocortical stimulation on wool growth. Animal Production 15, 39–46.Google Scholar
Tukey, J. W. (1953). Cited by Snedecor, G. W. In Statistical Methods, pp. 251, 5th edn, 3rd repr., Ames, Iowa, U.S.A.: Iowa State University Press.Google Scholar
Watson, A. (1963). The effect of climate on the colour change of Mountain hares in Scotland. Proceedings of the Zoological Society, London 141, 823–35.CrossRefGoogle Scholar