Follicle curvature score and its relationships with wool production

González, Ramiro Ernesto Almaguel; Lombardini, A.; Ibañez, W.

doi:10.1017/s0003356100002075

Cited by 1 publication

(2 citation statements)

References 8 publications

(12 reference statements)

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“…Clearly, genetic differences in wool growth must occur at the level of the follicle and could possibly arise from a difference in nutrient uptake by the follicle, efficiency of follicle function or a combination of these factors. While follicle characteristics such as density, curvature, depth and the ratio of secondary to primary follicles have previously been identified as genetically-related to wool growth (Nay 1966;Nay and Johnson 1967;Nay and Hayman 1969;Nay 1970;Rendel and Nay 1978;Gonzalez et al 1983), the present study is the first in which functionally-related characters, for example cell number, size and kinetics, have been compared between genotypes.…”

Section: Discussionmentioning

confidence: 98%

“…Variables such as feed intake (Williams 1979), digestive efficiency (Piper and Dolling 1969), and hormone and metabolite levels (Wallace 1979;Williams et al 1986;Hough et al 1988;Williams et al 1990) appear to be of minor importance or are a consequence rather than a cause of varying levels of wool production (Williams 1987). Similarly, certain morphological characteristics of wool follicles, such as depth, curvature and density, are associated with wool production (Nay 1966;Nay and Johnson 1967;Nay and Hayman 1969;Nay 1970;Gonzalez et al 1983), although they are clearly not a direct cause of differences in wool production between sheep. Recent studies indicate that a possible reason sheep differ in wool production under similar environmental conditions may lie in the functioning of the wool follicle (Black 1987;Williams and Winston 1987;Hynd 1989).…”

Section: Introductionmentioning

confidence: 99%

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Cellular characteristics of wool follicles and fibres in finewool and strongwool Merinos

Edwards¹,

Pi²

1992

Aust. J. Agric. Res.

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The genetic differences in the structure and function of wool follicles and their association with wool and fibre production were examined in 6 finewool Merinos (Camden Park) and 6 strongwool Merinos (East Bungaree). The strongwool Merinos produced 2.4 times more wool per unit area of skin and 3.5 times the volume of fibre per follicle than the finewool Merinos, when both groups were maintained under similar environmental conditions. The finewool Merinos had a higher follicle density, but a lower average volume of germinative tissue in the follicle bulb and the skin, than the strongwool Merinos. The number and volume of cells in the bulb, bulb cell production rate, cortical cell size and the proportion of bulb cells entering the fibre tended to be greater in the strongwool Merinos than the finewool Merinos, but were not statistically different between strains due to a high between-sheep, within-strain variation. In a stepwise linear regression, wool production per unit area was best predicted by the volume of germinative tissue in the bulb, together with follicle density. It is concluded that genotype determines the volume of potential mitotically-active tissue in the skin, however the dynamic mechanism of fibre production is not controlled by a single character, but rather a combination of a number of characteristics.

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