A method of fractionating raw fleece samples and some errors encountered in its use in experimental studies of fleece growth.

Daly, RA; Hb, Carter

doi:10.1071/ar9540327

Cited by 7 publications

(2 citation statements)

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“…The greasy, clipped wool samples were stored in a constant-humidity room and later fractionated using standard soxhlet procedure (Daly & Carter 1954). The wool was dried to a constant weight in a current of dry air at 105°c.…”

Section: Measurements Live Weightsmentioning

confidence: 99%

Wool production of Romney ewes and its relationship to cortical cell size

White

Henderson

1973

New Zealand Journal of Agricultural Research

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Seven Romney sheep which had different feed-to-wool conversion efficiencies were pen-fed for 9 mon:hs. Periodic measurements were made of fibre and cortical cell dimensions from clipped wool samples. Wool production did not differ significantly between high-and low-efficient groups of sheep. Cortical cell volume was not significantly correlated with fibre length, fibre diameter, clean wool production, or the previously determined conversion efficiencies of thes~ sheep. It would appear that differences between sheep in fibre volume were due to an increase in the number of proliferated cells entering the fibre cortex. These findings preclude the use of cell dimensions in breeding programmes as indicators of high wool production or ploduction efficiency. Cell length and diameter increased when wool growth rate was declining, and this is believed to be associated with a rapid decline in mitotic activity. It is suggested that increases in mitotic activity may result in lengthwise compression of differentiating cells. During p:.:riods of the year when mitotic activity is low, cellular compression within the follicle bulb will be at a minimum. This is postulated as resulting in a larger cell size in the winter

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Section: Measurements Live Weightsmentioning

confidence: 99%

Wool production of Romney ewes and its relationship to cortical cell size

White

Henderson

1973

New Zealand Journal of Agricultural Research

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“…All diazinon deposits were calculated on a clean dry fibre basis. Wax, suint, dirt, fibre and moisture weie determined by methods based on those of Daly and Carter (1954) and Freney (1940) as follows. Five grams o f wool were dried and extracted with carbon tetrachloride.…”

Section: A N a L Y X Smentioning

confidence: 99%

Investigation of Sheep Dips

O'Neill¹,

Hebden

1968

Aust Veterinary J

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Summary Groups of 30 sheep of four breeds (Merino, Dorset Horn, Romney Marsh and Border Leicester), that had been maintained under the same environmental and nutritional conditions were used in showering experiments with a diazinon emulsion. The fleeces of all breeds stripped (or depleted) diazinon from the dipping fluid. Diazinon was not deposited evenly down the length of the wool staple. On the Merino fleece, more diazinon was deposited on the outer section and less on the inner section near the skin. On the other breeds, more diazinon was found in the inner and less on the outer sections. Differences in the magnitude and location of the diazinon deposits are discussed, with the aid of supplementary in vitro dipping experiments, in relation to the compactness of the fleece and the amounts and distribution of wax, suint and dirt found there.

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Genetic parameters for wool production and quality traits in South Australian Merinos of the Collinsville family group

James¹,

Ponzoni²,

Walkley³

et al. 1990

Aust. J. Agric. Res.

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Heritabilities and phenotypic and genetic correlations for fleece traits were estimated from a data set comprising 805 male and female progeny of 44 sires of the Collinsville family group. Characteristics included in the study were greasy and clean fleece weight, yield, mean, standard deviation and coefficient of variation of fibre diameter, resistance to compression, scoured and greasy wool colour (expressed as yellowness, lightness and yellowness index), wax content, suint content, and subjectively assessed scores for greasy colour, character, handle, quality number, condition, staple formation, tip formation and density. Heritabilities of greasy and clean fleece weight, yield, mean fibre diameter and subjectively assessed fleece scores were in broad agreement with estimates from other Merino strains, but the genetic correlations of mean fibre diameter and associated characters (handle, quality number) with clean fleece weight were lower than previous estimates. Heritabilities for scoured yellowness of wool, resistance to compression and coefficient of variation of fibre diameter, which are potential additional measurements for the specification of wool in sale lots, were 0.42 (�. 0.14), 0.57 (� 0.15) and 0.47 ( � 0.15) respectively. Estimated heritabilities of wax and suint content were 0.24 (�0.11) and 0.44 ( � 0.14). Although the phenotypic correlations between measures of greasy wool colour and the corresponding measures of scoured wool colour were low (less than 0.3), the genetic correlations were moderate to high (0.4-0.9). Thus selection on the basis of greasy wool colour should lead to genetic improvements in scoured colour. The genetic correlations of resistance to compression with clean fleece weight and fibre diameter were: 0.46 (�0.21) and 0.44 (� 0.20) respectively, but there were no other strong, unfavourable correlations.

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A method of fractionating raw fleece samples and some errors encountered in its use in experimental studies of fleece growth.

Cited by 7 publications

References 0 publications

Wool production of Romney ewes and its relationship to cortical cell size

Wool production of Romney ewes and its relationship to cortical cell size

Investigation of Sheep Dips

Genetic parameters for wool production and quality traits in South Australian Merinos of the Collinsville family group

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