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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
10/07/2017 |
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Data da última atualização: |
10/07/2017 |
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Autoria: |
BALDWIN, B. A.; YATES, J. O. |
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Título: |
The effects of hypothalamic temperature variation and intracarotid cooling on behavioural thermoregulation in sheep. |
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Ano de publicação: |
1977 |
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Fonte/Imprenta: |
The Journal of Physiology, v. 265, n. 3, p. 705-720, Mar. 1977. |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: 1. Shorn-sheep, placed in cold environments, have been trained to turn on infra-red heaters. The effect, on this thermoregulatory behaviour, of warming and cooling the hypothalamus by means of a thermode has been examined. 2. At ambient temperatures of 5, 15, 25 and 35 degrees C; cooling the anterior hypothalamus by means of a thermode, for periods of 20 min, resulted in a marked increase in the rate of using the heaters. 3. At ambient temperatures of 5 and 15 degrees C, warming the anterior hypothalamus for periods of 20 min caused a considerable reduction in the rate of using the radiant heaters. 4. At an ambient temperature of 10 degrees C, a 2 hr period of hypothalamic cooling resulted in an increase in the rate at which the heaters were used for the first 70 min, but after this the effect was reduced and the reduction coincided with a rise of deep body temperature of about 0-75 degress C. 5. At an ambient temperature of 10 degress C, a 2 hr period of hypothalamic warming resulted in a reduction in the rate of operating the heaters during the first 85 min, but after this period the use of the heaters increased and this increase coincided with a fall of about 0-75 degrees C in deep body temperature. 6. At ambient temperatures of 15, 25 and 35 degrees C, the cephalic region was cooled by intracarotid injections of cold saline for periods of 15 min. This procedure lowered hypothalamic temperature by about 1 degree C and produced increases in the rate at which the heaters were used similar to those seen when the thermode was cooled. To elicit marked increases in the rate at which the heaters were used it was not necessary to lower hypothalamic temperature outside the normal range. MenosAbstract: 1. Shorn-sheep, placed in cold environments, have been trained to turn on infra-red heaters. The effect, on this thermoregulatory behaviour, of warming and cooling the hypothalamus by means of a thermode has been examined. 2. At ambient temperatures of 5, 15, 25 and 35 degrees C; cooling the anterior hypothalamus by means of a thermode, for periods of 20 min, resulted in a marked increase in the rate of using the heaters. 3. At ambient temperatures of 5 and 15 degrees C, warming the anterior hypothalamus for periods of 20 min caused a considerable reduction in the rate of using the radiant heaters. 4. At an ambient temperature of 10 degrees C, a 2 hr period of hypothalamic cooling resulted in an increase in the rate at which the heaters were used for the first 70 min, but after this the effect was reduced and the reduction coincided with a rise of deep body temperature of about 0-75 degress C. 5. At an ambient temperature of 10 degress C, a 2 hr period of hypothalamic warming resulted in a reduction in the rate of operating the heaters during the first 85 min, but after this period the use of the heaters increased and this increase coincided with a fall of about 0-75 degrees C in deep body temperature. 6. At ambient temperatures of 15, 25 and 35 degrees C, the cephalic region was cooled by intracarotid injections of cold saline for periods of 15 min. This procedure lowered hypothalamic temperature by about 1 degree C and produced increases in the rate at which the ... Mostrar Tudo |
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Palavras-Chave: |
Animal behaviour. |
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Thesaurus Nal: |
carotid arteries; Hypothalamus; Physiology; Sheep; Thermoregulation. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 02329naa a2200205 a 4500
001 2072351
005 2017-07-10
008 1977 bl uuuu u00u1 u #d
100 1 $aBALDWIN, B. A.
245 $aThe effects of hypothalamic temperature variation and intracarotid cooling on behavioural thermoregulation in sheep.
260 $c1977
520 $aAbstract: 1. Shorn-sheep, placed in cold environments, have been trained to turn on infra-red heaters. The effect, on this thermoregulatory behaviour, of warming and cooling the hypothalamus by means of a thermode has been examined. 2. At ambient temperatures of 5, 15, 25 and 35 degrees C; cooling the anterior hypothalamus by means of a thermode, for periods of 20 min, resulted in a marked increase in the rate of using the heaters. 3. At ambient temperatures of 5 and 15 degrees C, warming the anterior hypothalamus for periods of 20 min caused a considerable reduction in the rate of using the radiant heaters. 4. At an ambient temperature of 10 degrees C, a 2 hr period of hypothalamic cooling resulted in an increase in the rate at which the heaters were used for the first 70 min, but after this the effect was reduced and the reduction coincided with a rise of deep body temperature of about 0-75 degress C. 5. At an ambient temperature of 10 degress C, a 2 hr period of hypothalamic warming resulted in a reduction in the rate of operating the heaters during the first 85 min, but after this period the use of the heaters increased and this increase coincided with a fall of about 0-75 degrees C in deep body temperature. 6. At ambient temperatures of 15, 25 and 35 degrees C, the cephalic region was cooled by intracarotid injections of cold saline for periods of 15 min. This procedure lowered hypothalamic temperature by about 1 degree C and produced increases in the rate at which the heaters were used similar to those seen when the thermode was cooled. To elicit marked increases in the rate at which the heaters were used it was not necessary to lower hypothalamic temperature outside the normal range.
650 $acarotid arteries
650 $aHypothalamus
650 $aPhysiology
650 $aSheep
650 $aThermoregulation
653 $aAnimal behaviour
700 1 $aYATES, J. O.
773 $tThe Journal of Physiology$gv. 265, n. 3, p. 705-720, Mar. 1977.
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Embrapa Caprinos e Ovinos (CNPC) |
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| 1. |  | CARDOSO, F. F.; REIMANN, F. A.; YOKOO, M. J. I.; GULIAS GOMES, C. C.; SOLLERO, B. P.; CARDOSO, L. L.; ROSO, V. M.; BRITO, F. V.; CAETANO, A. R. Avaliação genômica para características de adaptação e caracterização racial de touros Hereford e Braford: edição 2016. Bagé: Embrapa Pecuária Sul, 2016. 92 p. (Embrapa Pecuária Sul. Documentos, 151).| Biblioteca(s): Embrapa Pecuária Sul; Embrapa Recursos Genéticos e Biotecnologia. |
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