Study of some physical wool characterization in Arabi ewes in Erbil Governorate

Main Article Content

Hani Nasser Hermiz
Ali H. H. Khoshnaw
Kanyaw I. Mahmood

Keywords

Wool Arabi Sheep Fiber diameter Regression Maximum R2

Abstract

This study was carried out at Private flock in Murtkah District - Erbil Governorate. Samples of wool were taken from mid-side of 72 Arabi ewes during May, 2017. to study the effect of ewes age and the sex of the lambs on the physical wool characteristics The overall means of raw fleece weight, clean fleece, fiber diameter, crimps, staple length and fiber length were 1653.75 g, 79.06%, 28.24 micron, 1.33 cm, 9.36 cm and 16.03 cm respectively. The percentages of the fibers of each of Fine, Coarse and Kemp were 52.42, 38.89 and 8.68% respectively. and S/P ratio 1.27. Age of ewe effects appeared to be significant on raw fleece weight and coarse fiber (p ≤ 0.05), also on fine fiber and (S/P) ratio (p ≤ 0.01) only, while the effects of sex of lamb were non-significant on all physical wool properties except the percentage of kemp fiber (p ≤ 0.05). Although the maximum R-square increased very little gradually in the equation to predict fleece weight depending on body weight and dimensions, the simplest equation includes body weight could be considered the most significant (P<0.01) and more reliable than others to predict fleece weight (The equation is: fleece weight = 353.41 + 31.84 (body weight). The multiple regression equations were calculated to predict clean wool percentage, staple length, fiber length, crimps, fine fiber percentage, coarse fiber percentage, and S/P ratio from fleece weight, body weight and dimensions and the maximum R-square for all characteristics were very small. Fiber diameter could be predicted using the formula of multiple regression includes body weight and length and chest depth according to the maximum R-square (P<0.01). While Kemp fiber percentage could be predicted using the formula includes body weight, fleece weight and Shoulder height. Only the simple regression equation of Fleece weight on body weight was significant (P<0.01) with R-square (0.19). The correlation coefficient was done among all studied characteristics and ranged between -0.69 (p<0.01) (between fine fiber and coarse fibers) and 0.94 (p<0.01) (between fine fiber and S/P ratio). It was concluded that wool properties of Arabi sheep were not at standard level especially in both fine and Kemp properties and need to be improved

Abstract 25 | pdf Downloads 23

References

A.S. (1978). Australian Standard Method of Test for Textile, A.S. 2001. 2.1, Determination of mean fiber diameter of textile fibers by the projection microscope.
Al-Azzawi, W.A. (1977). A comparative study of fleece characteristics in Iraqi sheep. M.Sc. Thesis Cairo. Univ. of Egypt.
Ashmway G.M.and Al-Azzawi W.A. (1980). Effect of age, locality and system of husbandry on fleece characteristics in Arabi sheep. Egypt J. Anim. Ptod.20 (2): 179-187.
Al-Oramary, R.A.S. (2002). A study on fleece characterization of Hamadani sheep in Erbil Plain. M.Sc. Thesis. Univ. of Salahaddin-Erbil. Iraq.
Ashmway, G.M. and Al-Azzawi, W.A. (1980). Effect of age, locality and system of husbandry on fleece characteristics in Arabi sheep. Egypt J. Anim. Ptod.20 (2): 179-187.
Aziz, K.O. (1991). Some wool physical characteristics of Karadi sheep. Mesopotamia J. Agric. 23(3):5-9.
Aziz, K.O. (1993). Some wool quality of Hamadani sheep. Mesopotamia J. Agric. 25(4):5-9.
Champion, S.C. and Robards, G.E. (2000). Follicle characteristics, seasonal change in fiber cross-sectional area and ellipticity. (In Australasian specialty carpet wool sheep). Romneys and Merinos. Small Ruminant Res. 38:71-82.
Chapman, R.E. (1960). In the biology of the fleece. (ed. By Fraser, A.S. and Short, B.F.) C.S.I.R.O. Animal Research Laboratories Technical. paper No. 3 Australia.
Dalton, D.C. and Rae, A.L. (1978). The New Zealand Romney sheep; A review of productive performance. Animal Breeding Abstracts. 46(12):657-680.
Draper, N.R. and Smith, H. (1966) Applied Regression Analysis. John Wiley and Sons, INC. USA. Pp:163.
Francis S.M.; Bray A.R. and Scales G.H. (2000). Wool quality characteristics of purebred Merino and Merino crossbred lambs from three to twelve months of age. International J. of Sheep and Wool Sci. 48(4):259-268.
Khoshnaw, A.H.H. (2007). Some factors affecting the physical wool characterization in Hamadani ewes and their lambs. Zanco J. of Pure and Applied Science. 25(13): 1-7.
Khoshnaw, A.H.H. and Hussein, A.A. (2014). The study of some physical wool characteristics in Karadi ewes depending on fiber type ratio. J. of Tikrit university for Agriculture Science (JTUAS). 14(1): 216-228.
Khoshnaw, A.H.H. and Hussein, A.A. (2013). The study of some physical wool characteristics in Karadi ewes. Zanco J. of Pure and Applied Science. 21(4): 13-21.
Ma'arof, N.N., Chakmakchy, A.M., Mostafa, K.S. and Singh, B.P. (1989). Preliminary studies on the wool quality traits of Hamadani sheep. 6th Inter. Conf. Animal. And Poultry Prod. Zagazig. Sept.21-23: 478-487.
McFarlane J.P. (1952). Seasonal pasture production in relation to seasonal wool growth. International J. of Sheep and Wool Sci. 4(2):73-76.
Ryder M.L. (1968). Wool Growth. Academic press London, New York.
SAS (2002-2003). Statistical analysis system. User's guide for personal computer. Version 9.1, SAS Institute Inc. Cary, NC, USA.
Taddo, H.R., Duga, L., Willems, P. and Somlo, R. (2000). Variation in fleece characteristics of Awassi sheep at different ages. Small Ruminant Research. 36(3): 285-291 (Abstract).
Von Bergen, M. (1963). Wool Handbook. 3rd ed. Vol. 1 John Willy& Sons Inc. New York London