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Birthcoat–adult fleece relationship: a study of kemp succession in a coarse wool breed of sheep

Published online by Cambridge University Press:  27 March 2009

R. A. Guirgis ,
H. M. H. El Gabbas ,
E. S. E. Galal  and
K. E. Ghoneim
R. A. Guirgis
Affiliation:
Wool Section, Department of Animal Production, Desert Institute, Matareya, Cairo, Egypt
H. M. H. El Gabbas
Affiliation:
Wool Section, Department of Animal Production, Desert Institute, Matareya, Cairo, Egypt
E. S. E. Galal
Affiliation:
Wool Section, Department of Animal Production, Desert Institute, Matareya, Cairo, Egypt
K. E. Ghoneim
Affiliation:
Department of Animal Production, Faculty of Agriculture, Ain ShamsUniversity, Cairo, Egypt
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Summary

The birthcoat of coarse wool Barki lambs was investigated at the age of 1–1·5 months. Lambs were covered when they were 2 months old to study kemp succession, and some other adult fleece traits, at the age of 16 months in relation to the birthcoat fibre type arrays. Samples were taken from three dorsal and three lateral positions. The average halo hair grade was 5·45% and the coarse fibre type array, plateau, contributed 64·7% of the birthcoat arrays, the rest were of the less coarse, saddle, type. Halo hair grade and fibre type arrays showed an antero-posterior gradient, increasing in score and coarseness posteriorly.

All halo hairs, 41·9% of super sickles and 22·6% of hairy tip curly tip fibres were shed as first generation kemp (G1 Curly tip and histerotrich fibres shed the least and they contributed the majority of the total persistent fibres. When pre-curly tip fibres increased in the birthcoat samples, that was followed by more kemp in the adult fleece.

The average G1% kemp was 4·43. Kemp decreased in subsequent generations, values were 34·50 and 8·37 for G2/G1% and G1/%, respectively. G1%, and G2/G1% kemp showed a general trend of an increase towards posterior positions; the shoulder position was an exception to that.

Coarse birthcoat fibre type arrays, plateau, were followed by more kemp in G1% and in successive generations than were the less coarse, saddle, arrays. High values of G2/G1% kemp were followed by significantly high G3/G1% kemp. Within animals, there was a significant correlation (P < 0·01) between halo hair grade and G1% kemp.

Staple length showed a tendency to increase towards posterior positions and females showed slightly longer staples than those of males. A slight trend of decrease in staple length was observed following the less coarse array, saddle, as compared with that which followed the coarse array, plateau.

For selection against kemp at an early stage, though birthcoat halo hair grade was positively correlated with G1% kemp, a high halo hair grade is essential for the lamb's early survival, hence fibre type arrays should be considered in selection. Less coarse birthcoat arrays, saddle in the present material, and a high, within array, curly tip: pre-curly tip ratio would be preferrable.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 92 , Issue 2 , April 1979 , pp. 427 - 436
Copyright
Copyright © Cambridge University Press 1979

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References

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. (1972). Effect of ova transfer on the birthcoat of lambs. Journal of Agricultural Science, Cambridge 78, 1–6.CrossRefGoogle Scholar
Carter, H. B. (1955). The hair follicle group in sheep. Animal Breeding Abstracts 23, 101–116.Google 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
Deshpaude, A. K. (1948). Studies on the biology of the fleece of the Scottish Mountain Blackface lamb. Ph.D. thesis, University of Leeds, England.Google 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. (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. (1940). Recent work on the wool zoology of the New Zealand Romney. New Zealand Journal of Science and Technology 22, 209–220.Google Scholar
Dry, F. W. (1955). Multifactorial inheritance of halo hair abundance in New Zealand Romney sheep. Australian Journal of Agricultural Research 6, 608–623.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 & Robertson.Google Scholar
Fbasbe, 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.Google Scholar
Galpin, N. (1936). The occurrence of a britch-poll fibre type array gradient in the New Zealand Romney lamb. Imperial Journal of Experimental Agriculture 4, 116–128.Google Scholar
Ghanem, Y. S. (1965). Wool studies of crossbred Merino × Barlri sheep living under desert conditions. Bulletin de l' Institut du Desert d' Egypt TXV, No. 1, 33–53.Google 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). The study of variability in some wool traits in a coarse wool breed of sheep. Journal of Agricultural Science, Cambridge 80, 233–238.CrossRefGoogle Scholar
Guirgis, R. A. (1977). Crossing Merino and a coarse wool breed of sheep; a study of tho birthcoat of lambs. Journal of Agricultural Science, Cambridge 88, 375–380.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, 345–349.CrossRefGoogle Scholar
Lockart, L. W. (1954). Sampling of fleeces for yield, staple length and crimps per inch measurement. Australian Journal of Agricultural Research 5, 555–567.CrossRefGoogle Scholar
Pukington, J. M. & Purser, A. F. (1958). Fibre medullation in Blackface lambs and hoggs. Journal of Agricultural Science, Cambridge 51, 257–264.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
Ross, J. M. & Wright, G. M. (1954). Kemp succession in N-type sheep. Australian Journal of Agricultural Research 5, 503–510.CrossRefGoogle Scholar
Ryder, M. L. & Stephenson, S. K. (1968). Wool Growth. London: Academic Press.Google Scholar
Sohinckel, P. G. (1951). Birthcoats of Australian Merino lambs. Nature, London 168, 698.CrossRefGoogle Scholar
Slee, J. (1959). Fleece shedding, staple length and fleece weight in experimental Wiltshire Horn × Scottish Blackface sheep crosses. Journal of Agricultural Science, Cambridge 53, 209–223.CrossRefGoogle Scholar
Slee, J. & Carter, H. B. (1962). Fibre shedding and fibre-follicle relationships in the fleeces of Wiltshire Horn × Scottish Blackface sheep crosses. Journal of Agricultural Science, Cambridge 58, 309–326.CrossRefGoogle Scholar
Snedecor, G. W. & Coohran, W. G. (1970). Statistical Methods. Ames: Iowa State University Press.Google Scholar
Stephenson, S. K. (1956). Some aspects of gene dosage in N-type sheep. Australian Journal of Agricultural Research 7, 447–468.CrossRefGoogle Scholar
Turner, H. N. (1956). Measurement as an aid to selection in breeding sheep for wool production. Animal Breeding Abstracts 24, 87–118.Google Scholar
Young, S. S. Y. & Chapman, R. E. (1958). Fleece characters and their influence on wool production per unit area of skin in Merino sheep. Australian Journal of Agricultural Research 9, 363–372.CrossRefGoogle Scholar