Seasonal wool production of Romney, Coopworth, Perendale, Cheviot, and Corriedale wethers

Bigham, M. L.; Sumner, R. M. W.; Elliott, K. H.

doi:10.1080/00288233.1978.10427422

Cited by 13 publications

(6 citation statements)

References 13 publications

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“…The effects of ewe cross on fleece weight, midside wool growth, and wool quality traits were consistent with the studies of Bigham et al (1978), Carter & Cox (1982), and Morris et al (1993). The absence of any major policy x cross interactions suggests that the ewe cross effects were generally additive with those of policy and therefore ewe cross effects will not be discussed further.…”

Section: Ewe Crosssupporting

confidence: 71%

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Effect of lambing policy and ewe breed cross on wool growth patterns and wool quality

Morris

McCutcheon

Blair

et al. 1994

New Zealand Journal of Agricultural Research

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Section: Ewe Crosssupporting

confidence: 71%

“…The fundamental causes of this seasonal cycle of wool growth remain obscure although wool growth is influenced both by photoperiodic effects (Hutchinson & WodzickaTomaszewska 1961;Bigham et al 1978;Geenty et New Zealand Journal of Agricultural Research, 1994, Vol. 37 al.…”

Section: Introductionmentioning

confidence: 99%

Effect of lambing policy and ewe breed cross on wool growth patterns and wool quality

Morris

McCutcheon

Blair

et al. 1994

New Zealand Journal of Agricultural Research

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“…Bigham et al (1978) suggested that in meat purpose breeds, wool growth rate in the summer is two to three times greater than in winter. Thus, increasing day-length during the experimental period might have resulted in a greater rate of wool growth and, consequently, in an increased proportion of wool in relation to the empty body weight.…”

Section: Resultsmentioning

confidence: 99%

Postweaning growth of the non-carcass components of Texel crossbred lambs

et al. 2010

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-Twenty 11/16 Texel × 5/16 Ile de France crossbred lambs were slaughtered at different body weights to evaluate the growth of their non-carcass components. Animals were weaned at 42 days of age (15.9 ± 2.1 kg of body weight), housed in individual stalls, and fed ad libitum. After ten days of an experimental adaptation period, 5 lambs were slaughtered. The remaining lambs were randomly assigned to one of three following slaughter weights: 25, 30 or 35 kg of body weight at fast. At slaughter, all body components were individually weighed and expressed as percentage of the empty body weight. To determine allometric growth of individual components, the exponential equation Y = aX b was logarithmically transformed and used. Proportions of feet and head decreased, while wool proportion increased linearly as slaughter weight increased. Greater fat deposition in viscera (kidney and mesenteric fat) was observed for lambs slaughtered at more elevated body weights. Growth rate of small intestine was lower than that of the empty body (b = 0.39), and it decreased linearly as a proportion of empty body weight with advancing maturity. Growth rates of both liver and large intestine were isogonics (b = 0.90 and 1.08, respectively), i.e., similar to the empty body weight. On the other hand, rumen presented late growth (b = 1.37), and its proportion was lower only for the lambs slaughtered at weaning (1.58% of EBW). Once increased slaughter weights result in higher deposition of nutrients on body parts that are not intended to consumption, maximum slaughter weight of 11/16 Texel × 5/16 Ile de France crossbred lambs is recommended to be at 30 kg of body weight.Key Words: allometry, gastrointestinal tract, intestines, organs, sheep, viscera, Crescimento dos componentes não-integrantes da carcaça de cordeiros mestiços Texel no período pós-desmama RESUMO -Vinte cordeiros 11/16 Texel × 5/16 Ile de France foram abatidos em diferentes pesos com o objetivo de avaliar o crescimento dos componentes não-integrantes da carcaça. Os animais foram desmamados aos 42 dias de idade (15,9 ± 2,1 kg de peso corporal) e confinados em baias individuais, recebendo alimentação à vontade. Após um período de 10 dias de adaptação às condições experimentais, 5 cordeiros foram abatidos e os remanescentes foram aleatoriamente sorteados para serem abatidos aos 25, 30 ou 35 kg de peso corporal em jejum. Ao abate, cada componente corporal foi pesado individualmente, e seus valores expressos em percentual do peso de corpo vazio (PCV). Para determinação do crescimento alométrico de cada componente, foi utilizada a equação exponencial Y = aX b , transformada logaritmicamente em um modelo linear. As proporções de patas e cabeça decresceram, e a de lã aumentou linearmente de acordo com o peso de abate. Observou-se acentuado acúmulo de gordura interna (renal e mesentérica) no corpo dos animais abatidos em pesos mais elevados. A taxa de crescimento do intestino delgado foi menor que a do corpo vazio (b = 0,39) o que reduziu a proporção desse órgão com o avanço d...

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“…(C) Ewe hoggets of the Romney, Coopworth, Variance components and Perendale breeds from the breed comparison The components of variation for loose wool bulk study (Dalton & Ackerley 1974;Bigham et al 1978) were derived from the following groups of sheep were sampled on the midside prior to shearing in (Table 1):…”

Section: Technique Developmentmentioning

confidence: 99%

“…(D) Mixed-age-ewes from the breed comparison study (Dalton & Ackerley 1974;Bigham et al 1978) with full length fleeces, were sampled on the midside prior to shearing in November 1978 and 1979.…”

Section: Sample Sizementioning

confidence: 99%

The measurement and sources of variation of loose wool bulk in Romney, Coopworth, and Perendale breeds

Bigham¹,

Sumner²,

Cox

1984

New Zealand Journal of Experimental Agriculture

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Modifications to the Wool Research Organisation of New Zealand (WRONZ) technique for loose wool bulk measurement of individual fleeces were investigated. Evidence indicates that, if care is taken in the wool scouring process, it is not necessary to degrease the scoured sample in petroleum ether. Sheep can adequately be ranked on loose wool bulk using a measurement taken at the first compression cycle. Sources of variation associated with loose wool bulk measurement have been estimated and used to calculate the numbers of animals required per treatment group to detect significant differences between groups for loose wool bulk.

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Seasonal wool production of Romney, Coopworth, Perendale, Cheviot, and Corriedale wethers

Cited by 13 publications

References 13 publications

Effect of lambing policy and ewe breed cross on wool growth patterns and wool quality

Effect of lambing policy and ewe breed cross on wool growth patterns and wool quality

Postweaning growth of the non-carcass components of Texel crossbred lambs

The measurement and sources of variation of loose wool bulk in Romney, Coopworth, and Perendale breeds

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