Guirgis,, R., Abdou, A., EI-Ganaieny, M. (2005). CORTICAL PATTERN OF COARSE BARKI WOOL FLEECES WITH DIFFERENT COTTING LEVELS. Journal of Animal and Poultry Production, 30(11), 6533-6541. doi: 10.21608/jappmu.2005.238438
R. A. Guirgis,; A. S. Abdou; M. M. EI-Ganaieny. "CORTICAL PATTERN OF COARSE BARKI WOOL FLEECES WITH DIFFERENT COTTING LEVELS". Journal of Animal and Poultry Production, 30, 11, 2005, 6533-6541. doi: 10.21608/jappmu.2005.238438
Guirgis,, R., Abdou, A., EI-Ganaieny, M. (2005). 'CORTICAL PATTERN OF COARSE BARKI WOOL FLEECES WITH DIFFERENT COTTING LEVELS', Journal of Animal and Poultry Production, 30(11), pp. 6533-6541. doi: 10.21608/jappmu.2005.238438
Guirgis,, R., Abdou, A., EI-Ganaieny, M. CORTICAL PATTERN OF COARSE BARKI WOOL FLEECES WITH DIFFERENT COTTING LEVELS. Journal of Animal and Poultry Production, 2005; 30(11): 6533-6541. doi: 10.21608/jappmu.2005.238438
CORTICAL PATTERN OF COARSE BARKI WOOL FLEECES WITH DIFFERENT COTTING LEVELS
Department of Wool Production and Technology, Animal Production Division, Desert Research Center, Matareya, Cairo, Egypt.
Abstract
Five adult Barki ewes of each of the four cotting levels: high, medium, low and zero were used. All the experimental animals grazed at Maryout Research Station (35 kilometers south west of Alexandria). Observations on cortical segmentation of fibres in the follicles were conducted .
The nature and presence of bilateral and radial cortical patterns of coarse Barki wool sheep is observed and discussed in relation to some physical properties of cotted fibres. The asymmetry in the cortex was studied using skin sections. The bilateral structure was present in both primary lateral and secondary fibres. Differences (p < O.05) occurred in mean area of par- cortical segment and mean ortho- to para- ratio between different cotting levels. The coarse wool fibres which were associated with low cotting levels were found to have the radial asymmetry which originated from the primary central follicles.
Regardless of follicular origin, there was a significant increase in the percentage of radial cortical type and a decrease in bilateral cortical type percentages with increasing cotting level, therefore selection for increasing bilateral pattern in fibres, through increasing SIP ratio, might contribute to a reduced ability towards cotting.
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