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 | Acesso ao texto completo restrito à biblioteca da Embrapa Caprinos e Ovinos. Para informações adicionais entre em contato com cnpc.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
01/08/1992 |
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Data da última atualização: |
02/05/2023 |
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Autoria: |
ARMSTRONG, D. G.; BLAXTER, K. L.; CLAPPERTON, J. L.; GRAHAM, N. M.; WAINMAN, F. W. |
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Título: |
Heat production and heat emission of two breeds of sheep. |
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Ano de publicação: |
1960 |
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Fonte/Imprenta: |
The Journal of Agricultural Science, v. 55, n. 3, p. 395-401, Dec. 1960. |
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DOI: |
10.1017/S0021859600023297 |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: 1. Fifty-two experiments were made with two Cheviot and two Blackface wether sheep in which heat production and heat emission were determined at environmental temperatures of 8, 20 and 32° C. Initially the sheep were closely clipped to within 1?2 mm. of the skin and the fleece was then allowed to grow throughout the experiments. 2. At 32° C. fleece length had no effect on heat production. At 20° C. metabolism was elevated until fleece length exceeded 18 mm. At 8° C. metabolism was elevated until the fleece length exceeded 35?40 mm. No differences were found between the two breeds in their heat production at a particular temperature provided fleece length was identical. 3. The sensible loss of heat divided by the temperature gradient from the rectum to the environment (conductance) was linearly related to the logarithm of fleece length, both at environmental temperatures above and below the critical temperature. 4. No differences between the two breeds or between them and Down Cross sheep were found with respect to their conductances when devoid of fleece. The insulation provided by unit length of fleece was the same in all three breeds and crosses. The fleece of the Blackfaces grew at twice the rate of that of the Cheviots so that at a given time after shearing, the Blackfaces were more resistant to concold. 5. Studies of the losses of heat by the vaporization of water and of skin and fleece surface temperatures also showed no differences between breeds. 6. Analysis of the relation between heat concold, ductance and fleece length suggests that vasoconstriction and vasodilation border on all-or-none effects. MenosAbstract: 1. Fifty-two experiments were made with two Cheviot and two Blackface wether sheep in which heat production and heat emission were determined at environmental temperatures of 8, 20 and 32° C. Initially the sheep were closely clipped to within 1?2 mm. of the skin and the fleece was then allowed to grow throughout the experiments. 2. At 32° C. fleece length had no effect on heat production. At 20° C. metabolism was elevated until fleece length exceeded 18 mm. At 8° C. metabolism was elevated until the fleece length exceeded 35?40 mm. No differences were found between the two breeds in their heat production at a particular temperature provided fleece length was identical. 3. The sensible loss of heat divided by the temperature gradient from the rectum to the environment (conductance) was linearly related to the logarithm of fleece length, both at environmental temperatures above and below the critical temperature. 4. No differences between the two breeds or between them and Down Cross sheep were found with respect to their conductances when devoid of fleece. The insulation provided by unit length of fleece was the same in all three breeds and crosses. The fleece of the Blackfaces grew at twice the rate of that of the Cheviots so that at a given time after shearing, the Blackfaces were more resistant to concold. 5. Studies of the losses of heat by the vaporization of water and of skin and fleece surface temperatures also showed no differences between breeds. 6. Analysi... Mostrar Tudo |
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Palavras-Chave: |
Termogenese; Thermogenesis. |
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Thesagro: |
Bioclimatologia; Calor; Ovino. |
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Thesaurus Nal: |
Ambient temperature; Bioclimatology; Heat production; Sheep. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 02455naa a2200289 a 4500
001 1520060
005 2023-05-02
008 1960 bl uuuu u00u1 u #d
024 7 $a10.1017/S0021859600023297$2DOI
100 1 $aARMSTRONG, D. G.
245 $aHeat production and heat emission of two breeds of sheep.$h[electronic resource]
260 $c1960
520 $aAbstract: 1. Fifty-two experiments were made with two Cheviot and two Blackface wether sheep in which heat production and heat emission were determined at environmental temperatures of 8, 20 and 32° C. Initially the sheep were closely clipped to within 1?2 mm. of the skin and the fleece was then allowed to grow throughout the experiments. 2. At 32° C. fleece length had no effect on heat production. At 20° C. metabolism was elevated until fleece length exceeded 18 mm. At 8° C. metabolism was elevated until the fleece length exceeded 35?40 mm. No differences were found between the two breeds in their heat production at a particular temperature provided fleece length was identical. 3. The sensible loss of heat divided by the temperature gradient from the rectum to the environment (conductance) was linearly related to the logarithm of fleece length, both at environmental temperatures above and below the critical temperature. 4. No differences between the two breeds or between them and Down Cross sheep were found with respect to their conductances when devoid of fleece. The insulation provided by unit length of fleece was the same in all three breeds and crosses. The fleece of the Blackfaces grew at twice the rate of that of the Cheviots so that at a given time after shearing, the Blackfaces were more resistant to concold. 5. Studies of the losses of heat by the vaporization of water and of skin and fleece surface temperatures also showed no differences between breeds. 6. Analysis of the relation between heat concold, ductance and fleece length suggests that vasoconstriction and vasodilation border on all-or-none effects.
650 $aAmbient temperature
650 $aBioclimatology
650 $aHeat production
650 $aSheep
650 $aBioclimatologia
650 $aCalor
650 $aOvino
653 $aTermogenese
653 $aThermogenesis
700 1 $aBLAXTER, K. L.
700 1 $aCLAPPERTON, J. L.
700 1 $aGRAHAM, N. M.
700 1 $aWAINMAN, F. W.
773 $tThe Journal of Agricultural Science$gv. 55, n. 3, p. 395-401, Dec. 1960.
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Embrapa Caprinos e Ovinos (CNPC) |
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| 1. |  | HUBINGER, S. Z.; SILMÕES, M. L.; FERREIRA, M. D. Análise preliminar do uso de espectroscopia de infravermelho próximo na quantificação de sólidos solúveis totais totais em frutas cítricas. In: SIMPÓSIO NACIONAL DE INSTRUMENTAÇÃO AGROPECUÁRIA, 2014, São Carlos, SP Anais do SIAGRO: ciência, inovação e mercado 2014. São Carlos, SP: Embrapa Instrumentação, 2014. p. 545-548. Editores: Carlos Manoel Pedro Vaz, Débora Marcondes Bastos Pereira Milori, Silvio Crestana.| Tipo: Artigo em Anais de Congresso |
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