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Crossing Merino and a coarse wool breed of sheep; a study of the birthcoat of lambs

Published online by Cambridge University Press:  27 March 2009

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

Birthooat fibre types were investigated in Barki, Merino and their crosses. The halo hair grade was high in the Barki breed, in the Merino a wide range of grades occurred but the majority was low. A trend of a decrease in halo-hair grade and an increase in non-hairy birthcoats occurred with the increase of Merino proportion in the crosses. An anterior reduction in halo-hair density was encountered in all groups under study.

Fibre type arrays were all coarse in Barki and ¼ Merino, the ¾ Merino had 50% fine arrays and 75% of the Merino arrays were fine. A trend towards a maternal influence on the birthcoat was observed in the ⅜ Merino and ⅝ Merino; more fine arrays were encountered in lambs born to dams with more Merino proportion.

Within saddle and ravine arrays, CT/Pre-CT ratio was highly significantly correlated with the pre-natal check as indicated by Merino proportion.

It was suggested, from the birthcoat studies, that ⅝ Merino might be the best combination in the Merino crosses as far as the fibre type arrays were concerned.

Less coarse arrays were encountered in the birthcoat due to selection against kemp in rams used for breeding.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 88 , Issue 2 , April 1977 , pp. 375 - 380
Copyright
Copyright © Cambridge University Press 1977

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References

Badreldin, A. L. & Marai, I. F. M. (1966). Wool follicle development in relation to fleece type in Barki, Merino, Ossimi and Texel sheep. Journal of Animal Production, U.A.R. 6, 105–15.Google Scholar
Burns, M. (1955). Observations on Merino × Herdwick hybrid sheep with special reference to the fleece. Journal of AgriculturalScience, Cambridge 46, 389–406.CrossRefGoogle Scholar
Burns, M. (1966). Merino birthcoat fibre types and their follicular origin. Journal of Agricultural Science, Cambridge 66, 155–73.CrossRefGoogle Scholar
Burns, M. (1972). Effect of ova transfer on the birthcoats of lambs. Journal of Agricultural Science, Cambridge 78, 1–6.CrossRefGoogle Scholar
Burns, M. & Ryder, M. L. (1974). Effect of egg transfer on the skin follicles and birthcoats of Finnish Landrace and Soay lambs. Journal of Agricultural Science, Cambridge 82, 209–16.CrossRefGoogle Scholar
Daley, R. A. & Carter, H. B. (1955). The fleece growth of young Lincoln, Corriedale, Polwarth, and fine Merino maiden ewes under housed conditions and unrestricted and progressively restricted feeding on a standard diet. Australian Journal of Agricultural Research 6, 476–513.CrossRefGoogle Scholar
Dry, F. W. (1933). Hairy fibres of the Romney sheep. New Zealand Journal of Agriculture 46, 10–22.Google Scholar
Dry, F. W. (1934). Fibre type arrays and hairiness. New Zealand Journal of Agriculture 48, 37–48.Google Scholar
Dry, F. W. (1955). Multifactorial inheritance of halo hair abundance in New Zealand Romney sheep. Australian Journal of Agricultural Research 6, 608–23.CrossRefGoogle Scholar
Dry, F. W. (1965). Lamb fibre types. In Biology of Skin and Hair Growth (ed. Lyne, A. G. and Short, B. F.), pp. 89–104. Sydney: Angus and Robertson.Google Scholar
Dry, F. W. & Stephenson, S. K. (1954). Presence and absence of the pre-natal check in lambs' birthcoats. Nature, London 173, 878–9.CrossRefGoogle ScholarPubMed
Fahmy, M. H., Galal, E., Salah, E., Ghanem, Y. S. & Khishin, E. S. (1969). Crossbreeding of sheep under semi-arid conditions. Animal Production 11, 35–60.Google Scholar
Fraser, A. S., Ross, J. M. & Wright, G. M. (1954). Development of the fibre population in N-type sheep Australian Journal of Agricultural Research 5, 490–502.CrossRefGoogle Scholar
Galal, E. Salah 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
Ghanem, Y. S. (1965). Wool studies of crossbred Merino x Barki sheep living under desert conditions. Bulletin del'Institul du Désert d' Egypt TXV, No. 1, 33–53.Google Scholar
Goot, H. (1941). Evolution of the fleece of the sheep. Nature, London 148, 596–7.CrossRefGoogle Scholar
Guirgis, R. A. (1964). Fibre type arrays and kemp succession in sheep. M.Sc. Thesis, The University of Leeds, England.Google Scholar
Guirgis, R. A. (1967a). The inheritance of birthcoat characters in Barki, Merino and their crosses. East African Agricultural and Forestry Journal 32, 305–9.CrossRefGoogle Scholar
Guirgis, R. A. (1967b). Fibre type arrays and kemp succession in sheep. Journal of Agricultural Science, Cambridge 68, 75–85.CrossRefGoogle Scholar
Guirgis, R. A. & Galal, E. Salah E. (1972). The association between kemp and some vigour and wool characteristics in Barki and Merino Barki cross. Journal of Agricultural Science, Cambridge 78, 345–9.CrossRefGoogle Scholar
Purser, A. F. & Karam, H. A. (1967). Lamb survival, growth and fleece production in relation to birthcoat type among Welsh Mountain sheep. Animal Production 9, 75–85.Google Scholar
Ryder, M. L. & Stephenson, S. K. (1968). Wool Growth. London: Academic Press.Google Scholar
Stephenson, S. K. (1956). Some aspects of gene dosage in N-type sheep. Australian Journal of Agricultural Research 7, 447–68.CrossRefGoogle Scholar
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, (3), 333–45.Google Scholar