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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: |
29/06/2023 |
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Autoria: |
BORUT, A.; DMI'EL, R.; SHKOLNIK, A. |
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Título: |
Heat balance of resting and walking goats: comparison of climatic chamber and exposure in the desert. |
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Ano de publicação: |
1979 |
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Fonte/Imprenta: |
Physiological Zoology, v. 52, n. 2, p. 105-112, 1979. |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: In this study we compared heat-balance experiments carried out under standardized and defined conditions-i.e., climatic chamber-with those performed under the complexity of natural conditions, using identical methodology and instrumentation. Heat production and the partitioning of evaporative cooling were measured in the black bedouin goat from the Sinai desert when the goats rested or walked on a treadmill in a climatic chamber (26 C and 40 C, relative humidity 30%). These were measured in the same goats while they were fully exposed to desert conditions. Heat production of resting goats was 2 kcal (kg.h)⁻¹ at 26 C and morning experiments in the field and 2.5 kcal (kg·h)⁻¹ at 40 C and noon experiments. Heat production of goats walking at a speed of 2.60-2.95 km·h⁻¹ was 4.1-4.9 kcal (g·h)⁻¹ in both climatic chamber and field experiments. Under mild conditions, 26 C and morning, evaporation dissipated up to 50% of the heat produced. At 40 C in climatic chamber, evaporation equaled heat production, but at noon in the desert it increased twofold. Under these desert conditions both resting and walking goats had the same excess, 1.72 kcal (kg·h)⁻¹, of evaporative heat loss over heat production. This represents the net heat load imposed by the desert environment; its magnitude approximately equals the goat's resting metabolism. In the climatic chamber the goats used mostly panting to dissipate heat. In the desert, however, the amounts of heat dissipated by sweating were twice as great as those lost through the respiratory system. These high rates of sweating (up to 143 g H₂O [m²·h]⁻¹) are attributed to the absorption of solar radiation, a factor which does not exist in the laboratory but is very prominent in the desert environment. MenosAbstract: In this study we compared heat-balance experiments carried out under standardized and defined conditions-i.e., climatic chamber-with those performed under the complexity of natural conditions, using identical methodology and instrumentation. Heat production and the partitioning of evaporative cooling were measured in the black bedouin goat from the Sinai desert when the goats rested or walked on a treadmill in a climatic chamber (26 C and 40 C, relative humidity 30%). These were measured in the same goats while they were fully exposed to desert conditions. Heat production of resting goats was 2 kcal (kg.h)⁻¹ at 26 C and morning experiments in the field and 2.5 kcal (kg·h)⁻¹ at 40 C and noon experiments. Heat production of goats walking at a speed of 2.60-2.95 km·h⁻¹ was 4.1-4.9 kcal (g·h)⁻¹ in both climatic chamber and field experiments. Under mild conditions, 26 C and morning, evaporation dissipated up to 50% of the heat produced. At 40 C in climatic chamber, evaporation equaled heat production, but at noon in the desert it increased twofold. Under these desert conditions both resting and walking goats had the same excess, 1.72 kcal (kg·h)⁻¹, of evaporative heat loss over heat production. This represents the net heat load imposed by the desert environment; its magnitude approximately equals the goat's resting metabolism. In the climatic chamber the goats used mostly panting to dissipate heat. In the desert, however, the amounts of heat dissipated by sweating were ... Mostrar Tudo |
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Thesagro: |
Bioclimatologia; Caprino; Fisiologia. |
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Thesaurus Nal: |
Animal physiology; Bioclimatology; Deserts; Goats. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 02438naa a2200229 a 4500
001 1520144
005 2023-06-29
008 1979 bl uuuu u00u1 u #d
100 1 $aBORUT, A.
245 $aHeat balance of resting and walking goats$bcomparison of climatic chamber and exposure in the desert.$h[electronic resource]
260 $c1979
520 $aAbstract: In this study we compared heat-balance experiments carried out under standardized and defined conditions-i.e., climatic chamber-with those performed under the complexity of natural conditions, using identical methodology and instrumentation. Heat production and the partitioning of evaporative cooling were measured in the black bedouin goat from the Sinai desert when the goats rested or walked on a treadmill in a climatic chamber (26 C and 40 C, relative humidity 30%). These were measured in the same goats while they were fully exposed to desert conditions. Heat production of resting goats was 2 kcal (kg.h)⁻¹ at 26 C and morning experiments in the field and 2.5 kcal (kg·h)⁻¹ at 40 C and noon experiments. Heat production of goats walking at a speed of 2.60-2.95 km·h⁻¹ was 4.1-4.9 kcal (g·h)⁻¹ in both climatic chamber and field experiments. Under mild conditions, 26 C and morning, evaporation dissipated up to 50% of the heat produced. At 40 C in climatic chamber, evaporation equaled heat production, but at noon in the desert it increased twofold. Under these desert conditions both resting and walking goats had the same excess, 1.72 kcal (kg·h)⁻¹, of evaporative heat loss over heat production. This represents the net heat load imposed by the desert environment; its magnitude approximately equals the goat's resting metabolism. In the climatic chamber the goats used mostly panting to dissipate heat. In the desert, however, the amounts of heat dissipated by sweating were twice as great as those lost through the respiratory system. These high rates of sweating (up to 143 g H₂O [m²·h]⁻¹) are attributed to the absorption of solar radiation, a factor which does not exist in the laboratory but is very prominent in the desert environment.
650 $aAnimal physiology
650 $aBioclimatology
650 $aDeserts
650 $aGoats
650 $aBioclimatologia
650 $aCaprino
650 $aFisiologia
700 1 $aDMI'EL, R.
700 1 $aSHKOLNIK, A.
773 $tPhysiological Zoology$gv. 52, n. 2, p. 105-112, 1979.
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