The densities of fiber follicles in the Karakaç, Norduz, and Zom sheep and a comparative analysis

Tuncer, Selçuk Seçkin; Uslu, Sema; Taş, Abdurrahim; Şireli, Halit Deniz

doi:10.4067/s0719-81322018000100105

Cited by 11 publications

(8 citation statements)

References 5 publications

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“…The P follicles are formed first, commonly arranged in trio groups. Densities average 3-5/mm 2 , and each is associated with a sweat gland and arrector muscle (Tänzer, 1926;Carter, 1968;Tuncer et al, 2018). Later, S follicles develop, initially at non-randomly spaced sites in the skin: the secondary original follicles.…”

Section: Development Of the Follicle Populationmentioning

confidence: 99%

Evolution of the sheep coat: the impact of domestication on its structure and development

Jackson

Maddocks

Watts³

et al. 2020

Genet. Res.

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Wild sheep and many primitive domesticated breeds have two coats: coarse hairs covering shorter, finer fibres. Both are shed annually. Exploitation of wool for apparel in the Bronze Age encouraged breeding for denser fleeces and continuously growing white fibres. The Merino is regarded as the culmination of this process. Archaeological discoveries, ancient images and parchment records portray this as an evolutionary progression, spanning millennia. However, examination of the fleeces from feral, two-coated and woolled sheep has revealed a ready facility of the follicle population to change from shedding to continuous growth and to revert from domesticated to primitive states. Modifications to coat structure, colour and composition have occurred in timeframes and to sheep population sizes that exclude the likelihood of variations arising from mutations and natural selection. The features are characteristic of the domestication phenotype: an assemblage of developmental, physiological, skeletal and hormonal modifications common to a wide variety of species under human control. The phenotypic similarities appeared to result from an accumulation of cryptic genetic changes early during vertebrate evolution. Because they did not affect fitness in the wild, the mutations were protected from adverse selection, becoming apparent only after exposure to a domestic environment. The neural crest, a transient embryonic cell population unique to vertebrates, has been implicated in the manifestations of the domesticated phenotype. This hypothesis is discussed with reference to the development of the wool follicle population and the particular roles of Notch pathway genes, culminating in the specific cell interactions that typify follicle initiation.

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Section: Development Of the Follicle Populationmentioning

confidence: 99%

Evolution of the sheep coat: the impact of domestication on its structure and development

Jackson

Maddocks

Watts³

et al. 2020

Genet. Res.

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“…Histological studies make it possible to judge the constitutional and breed affiliation, to carry out a biological assessment of various technologies for keeping animals, to assess the level of productivity, to assess the physical and technological qualities of sheepskins, the age of animals, etc. [8,9,10].…”

Section: Introductionmentioning

confidence: 99%

Environment and sheep wool quality indicators

Ostapchuk

Pashtetsky

Usmanova

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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The features of the skin histology and the determination of the quality indicators of wool of young female Tsigai breed sheep are presented in the article. A positive correlation was found between the fineness of the wool and the live weight (p ≤ 0.05); between the shearing of natural wool and the fineness of the wool (p ≤ 0.05); between the shearing of natural wool and the live weight (p ≤ 0.05); between the washed wool and the fineness of the wool (p ≤ 0.05) and the shearing of natural wool (p ≤ 0.05). There is no reliable relationship between the fineness and the percentage of the washed wool shearing. However, the percentage of the shearing of washed wool is negatively related to the live weight (p ≤ 0.05), the shearing of natural wool. The greatest thickness of the skin was on the back and leg are 968.07 and 968.24 microns respectively. It is assumed that the skin regeneration occurs due to the cells of the basal layer. This is due to the fact that the thickness of the basal layer decreases in the following order: side-back-leg-neck, which correlates with the degree of exposure to damaging factors on these areas.

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“…Thus, when sheep reach the age of 8-9 months, the pigmentation process is suspended in 96% of the hair follicles of sheep wool. Foreign geneticists, such as Ciani (2015), Tuncer (2018) and Jackson (2020), believed that an essential regulatory mechanism controlling the effectiveness of melanocytes in the cells of hair follicles is a change in the ability of the cell to support an internal stable chemical environment (the concentration of certain hormones). Thus, it is necessary to find out how to select a genetically pure breed according to the krimmer properties in the first generation using the method of observations at the stage of maturation of black Karakul sheep.…”

Section: Introductionmentioning

confidence: 99%

Age-Dependent Depigmentation of Black Karakul Sheep

2022

Int J Vet Sci

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The relevance of the subject under study is conditioned upon changes in the exchange of melanin in skin cells, which result in unevenly coloured sheep hair. The purpose of this study investigated the nature of depigmentation inheritance of the hair of black Karakul sheep in ontogenesis. The objective method was the main method used in the study. The results of the study showed that the climate was one of the factors for preserving the colour of the desired shade of an adult. Bonitation of young animals according to the pronounced pigmentation of krimmer lamb takes place when the young animals reach the age of one and a half years. During this period pigmentation gradually decreases, and the wool becomes completely white. The originality of this study lies in the analysis of the cellular mechanism of regulation of melanogenesis in sheep. The materials of this paper are of practical value for breeders in controlling a biological phenomenon that affects the quality of the Karakul sheep breed.

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The densities of fiber follicles in the Karakaç, Norduz, and Zom sheep and a comparative analysis

Cited by 11 publications

References 5 publications

Evolution of the sheep coat: the impact of domestication on its structure and development

Evolution of the sheep coat: the impact of domestication on its structure and development

Environment and sheep wool quality indicators

Age-Dependent Depigmentation of Black Karakul Sheep

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