Fibre-type arrays and kemp succession in sheep

Guirgis, R. A.

doi:10.1017/s0021859600017883

Cited by 15 publications

(22 citation statements)

References 14 publications

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“…The sudden decrease in size of fibres was found in the primitive and wild types of sheep (Dry, 1933(Dry, , 1934 and this pattern had been retained in the carpet types, whereas in the Merino the size order was upset (Burns, 1966). Guirgis (1964) found the precipice in most of the N-Type Romney plateau arrays. He concluded that where precipice occurred between HTCT and CT fibres, it supported Dry's (1933Dry's ( , 1934 conclusion that the precipice stands between the primary and secondary follicles.…”

Section: Discussionmentioning

confidence: 98%

“…The lower frequency of precipice within the CT group of the experimental flock might be due to the increase of saddle arrays, that occurred as a result of selection against kemp. Guirgis (1964), in a study of N-type Romney birthcoats, found that the precipice appeared to be reduced when the pre-natal check was more effective.…”

Section: The Second Group Of Barki Birthcoats {The Farmers' Flocks)mentioning

confidence: 98%

“…Birthcoat halo hair grades on two dorsal positions The present work was undertaken to study the (withers and back, Guirgis, 19676) were assessed, birthcoat fibre types of Merino, the local Barki according to the halo hair density (Dry, 1955), from * Present address: Wool Technology Section, De-S r a d e 1 ( n0 h a l° h a i r s ) t o S r a d e 7 ( d e n s e m a s s o f partment of Animal Husbandry, College of Agriculture halo hairs), and Forestry, Mosul University, Hammam El-Alii, Iraq.…”

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confidence: 99%

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

Guirgis

1977

J. Agric. Sci.

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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 £ Merino, the f Merino had 50 % fine arrays and 75 % of the Merino arrays were fine.

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Section: Discussionmentioning

confidence: 98%

Section: The Second Group Of Barki Birthcoats {The Farmers' Flocks)mentioning

confidence: 98%

mentioning

confidence: 99%

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

Guirgis

1977

J. Agric. Sci.

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“…A small snippet was placed on black velvet and was visually divided into four types of fiber, i.e. fine (non-medullated), coarse (medullated), heterotype and kemp (more than 85% of cross sectional area as medulla) according to (Guirgis, 1967); unless than 300 fibers from each sample were used in this test. Benzene test was used to differentiate between coarse and fine fibers (Ryder and Stephenson, 1968).…”

Section: Wool Sampling and Measurementsmentioning

confidence: 99%

Wool Production and Characteristics, Physiological and Haematological Parameters and Level of some Metabolic Hormones in Barki Ewes Shorn in Autumn as Alternative of Spring Shearing

Taha

Abdel-Khalek

Khalil

et al. 2018

Journal of Animal and Poultry Production

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This study was conducted under the semi-arid desert conditions of the northwest coastal belt of Egypt to evaluate the effect of autumn vs. spring shearing on wool production, some wool traits, physiological responses, thermal gradients, haematological, biochemical parameters and hormonal profile of thyroxin (T4) and cortisol of adult Barki ewes. Results show that autumn shearing reduced (P<0.01) body weight loss; resulted in heavier (P<0.05) greasy fleece weight with lower fiber diameter (P<0.05) and improved the uniformity of wool fiber diameter, point of staple break (P<0.05) and wool staple elongation rate (P<0.01) compared with spring shearing. Spring shearing resulted in higher skin temperature (P<0.05) and thermal gradient between rectal and skin temperature (P<0.01), elevated (P<0.05) serum globulin concentration and declined (P<0.05) albumin/globulin ratio. Serum T4 and cortisol profiles were not affected by shearing in spring or autumn. These results indicated that altering shearing time of Barki sheep from spring to autumn may be safely conducted without negative effects on wool production, physiological responses, blood constituents and animal homeostasis. The reduction in body weight due to shearing suggests the necessity of providing additive food supplementation after shearing to avoid weight loss particularly in autumn.

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“…The higher frequency of saddle array might have accounted for the lower frequency of precipice encountered in the present Barki material. Guirgis (1964) reported a reduction in the frequency of precipice when the pre-natal check was more effective, in N-type birthcoats.…”

Section: Discussionmentioning

confidence: 99%

Post-natal development, dimensions of the skin follicle population and birthcoat follicular origin in Barki and ⅜ Merino lambs

et al. 1981

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In a study of two breed groups, coarse wool Barki and f Merino f Barki, data were obtained on skin histology from birth to the age of 1 year, birthcoat fibre type arrays and fibre-follicle relationship.The | Merino exceeded Barki lambs in the maximum S/P ratio, values of which were 3-40 and 5-64 obtained at 6 and 8 months in Barki and § Merino respectively.Internal diameters of primary follicles ranged from 39-0 to 64-7 and from 41-0 to 56-8 fim; those of secondaries ranged from J9-8 to 34-9 and from 22-6 to 33-3 fim in Barki and f Merino respectively.The ratio of primary to secondary follicle diameters showed high values in both breed groups; averages were 1-89 and 1-71 for internal diameter and 1-86 and 1-71 for external diameter in Barki and f Merino respectively.Birthcoat fibre type arrays were mostly saddle, only 8-3 % were plateau (P 3 ) in both breed groups.

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Fibre-type arrays and kemp succession in sheep

Abstract: A study of fibre-type arrays in relation to kemp succession in Kerry, Cheviot-cross and Swaledale lambs has been carried out. It is found that:1. There is a general association between HH grade and array such that higher grades tend to have stronger arrays.

Cited by 15 publications

References 14 publications

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

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

Wool Production and Characteristics, Physiological and Haematological Parameters and Level of some Metabolic Hormones in Barki Ewes Shorn in Autumn as Alternative of Spring Shearing

Post-natal development, dimensions of the skin follicle population and birthcoat follicular origin in Barki and ⅜ Merino lambs

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