Studies of Comparative Fleece Growth in Sheep I. The Quantitative Nature of Inherent Differences in Wool-Growth Rate

Ferguson, KA; Hb, Carter; Hardy, Margaret H.

doi:10.1071/bi9490042

Cited by 21 publications

(10 citation statements)

References 4 publications

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“…Whereas other workers have postulated from studies under more specifically controlled conditions the possible effects of temperature (Ferguson et al 1949), day-length (Hart, 1955) and light rhythm (Rougeot, 1957;Wildman, 1957) it is not possible from the purely observational data in our case to hazard any definite conclusions on the relative significance of the environmental components recorded. This problem is especially notable in the Wiltshire data, where the coincidence of curves may indicate either a direct causal connexion, or merely a similarity between the environmental fluctuations and an innate or systemically controlled pelage cycle overt in the Wiltshire but occult in the Merino.…”

Section: Discussioncontrasting

confidence: 61%

“…1, the relative constancy of fibre diameter in the Merinos is well contrasted with the wide fluctuations of this character in the Wiltshires. What variation in diameter appears in the Merinos lies within the acceptable limits for physiologically unstressed adult ewes of this breed (Ferguson, Carter & Hardy, 1949). The general level of diameter maintained is close to the mean maximum for the fine-wool genotype within the breed (Daly & Carter, 1955).…”

Section: Resultsmentioning

confidence: 51%

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A comparative study of fleece growth in Tasmanian Fine Merino and Wiltshire Horn ewes

Slee¹,

Carter²

1961

J. Agric. Sci.

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1. From repeated fibre samplings and several skin biopsies on six Tasmanian Fine Merinos and eight Wiltshire Horn adult ewes variations in fibre diameter, fibre growth rate, and fibre regeneration or shedding frequency were measured over a period of 15 months. Slight differences were present in the treatment of the two breeds, but from the combined evidence of the live weights and fibre diameters maintained, it was concluded that these were negligible, that both breeds were under closely comparable conditions, and that their performance was at a moderately high and typical level for each breed.2. In the Merinos fibre diameter (ca. 20 µ) fluctuated little during the period of observation, whereas in the Wiltshires it varied over a wide range from less than 40µ in winter to more than 80µ in summer. There were negligible differences between the three body regions, back, side, and belly, in the Merinos, but in the Wiltshires the belly grew markedly coarser fibres than the other two regions.3. The fibre growth rate in the Merinos did not vary greatly from 7 to 8 mm. per 28 days throughout the period of observation or between the body regions. In the Wiltshires, fibre growth rate showed extreme variations from a minimum of about 3 mm. during the winter to a maximum of about 12 mm. per 28 days at the end of summer, with significant differences between the three body regions. However, in spite of these differences in the mode of growth, the total length of fibre grown per annum at the midside was approximately the same (10 cm.). Thus, were it not for fibre shedding, the Wiltshire Horn breed would grow a short-wool fleece.

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Section: Discussioncontrasting

confidence: 61%

Section: Resultsmentioning

confidence: 51%

A comparative study of fleece growth in Tasmanian Fine Merino and Wiltshire Horn ewes

Slee¹,

Carter²

1961

J. Agric. Sci.

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“…The relation between food intake and either body or wool growth is known to be one of diminishing returns (Marston 1948;Ferguson et al 1949) with different sheep varying in growth potential. It was, however, not possible to detect curvilinearity in growth reponse in the small groups in this trial.…”

Section: Discussionmentioning

confidence: 99%

Efficiency of wool and body growth in pen-fed Romney, Coopworth, Perendale, and Corriedale sheep

Sumner

1979

New Zealand Journal of Agricultural Research

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Ten 1-year-old sheep of each of the breeds were pen-fed a pelleted diet of 60:40 maize: lucerne at 30, 40, 50, 60, or 70 g/kg initial live weight 0075 /day for 21 weeks divided into 3 equal periods. Intake, wool growth, and body growth were considered relative to body weighto' 75 to allow for the effect of between-breed differences in body size. Estimates of the conversion of dry matter (DM) intake/body weighto. 75 to body weight gain/body weight o . 75 did not differ between breeds or periods. On a pooled within-breed, within-period basis, wool growth/ body weight o . 75 (r = 0.69) and fibre diameter (r = 0.69) were correlated with DM intake/body weight 0075 • During the last 2 periods the sulphur content of the fleece wa:o correlated within breeds (r = 0.62) with DM intake/body weighto. 75 • Fibre diameter (r = 0.76) and sulphur content of the fleece (r = 0.62) were correlated with wool growth/body weight o · 75 • The regression coefficient for the regression of clean wool/body weight o . 75 on DM intake/body weighto. 75 did not differ between breeds but increased between periods as the seasonal wool growth maximum was approached. The intercepts were different between breeds and decreased between periods. The ranking of breeds for clean wool/ body weight o . 75 at an intake of 40 g DM/body weight o . 75 /day was Corriedale, Coopworth, Romney, and Perendale in the winter and spring and Coopworth, Corrieda1c, Romney, and Perendale in the early summer. The regression coefficients for the regression of both fibre diameter and sulphur content of the fleece on clean wool/body weighto. 75 did not differ between breeds or periods. The intercepts, which differed between breeds, did not differ between periods. 251

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“…Nutritional studies of wool production have been confined largely to the effects of different levels of nutrition on pen-fed sheep (Weber, 1931;Marston, 1948;Ferguson, Carter & Hardy, 1949;Daly & Carter, 1955), and there have been few investigations on the effects of variation in feed quality under grazing conditions.…”

mentioning

confidence: 99%

Studies in the evaluation of pasture quality with young grazing sheep:Observations on wool production, carcass appraisal and reticulo-ruminal characteristics

Gallagher

Watkin

1967

J. Agric. Sci.

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Studies of Comparative Fleece Growth in Sheep I. The Quantitative Nature of Inherent Differences in Wool-Growth Rate

Cited by 21 publications

References 4 publications

A comparative study of fleece growth in Tasmanian Fine Merino and Wiltshire Horn ewes

A comparative study of fleece growth in Tasmanian Fine Merino and Wiltshire Horn ewes

Efficiency of wool and body growth in pen-fed Romney, Coopworth, Perendale, and Corriedale sheep

Studies in the evaluation of pasture quality with young grazing sheep:Observations on wool production, carcass appraisal and reticulo-ruminal characteristics

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