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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
07/03/1997 |
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Data da última atualização: |
07/03/1997 |
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Autoria: |
KASTELIC, J. P.; COOK, R. B.; COULTER, G. H. |
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Título: |
Contribution of the scrotum and testes to scrotal and testicular thermoregulation in bull and rams. |
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Ano de publicação: |
1996 |
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Fonte/Imprenta: |
Journal of Reproduction and Fertility, v.108, n.1, p.81-85, 1996. |
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Idioma: |
Inglês |
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Conteúdo: |
A novel model was used to determine the roIe of the scrotum and testes in scrotal/testicular thermoregulation in bulls and rams. Eleven yearling bulls and 12 yearling rams were used at an ambient temperature of 15°C. The distal lateral aspects and entire ventral part of the scrotum were incised under caudal epidural analgesia (xylazine, 0,07 mg ml-1. Both testes were withdrawn from the scrotum, the vaginal tunic was removed and one testis was replaced in the scrotum. Surface and internaI temperatures were measured with infrared thermography and needle thermocouples, respectively. Temperature gradients (difference in temperature from top to bottom; °C) for bulls and rams, respectively, Were: scrotal surface (with replaced testis) 2.1 and 3,5; scrotal surface (without testis) 2.5 and 3.6; scrotal subcutaneous (with replaced testis) 1,0 and 0.7; testicular subtunic (without scrotum) - 0.7 and - 0.3; deep intratesticular (with scrotum) - 0.2 and - 0.6; and deep intratesticular (without scrotum) - 0.5 and - 0.5. Results supported the hypotheses that the scrotum has a positive temperature gradient (warmer at the top than the bottom) and that the testis has a negative temperature gradient (warmer at the bottom than the top), These opposing gradients apparently complement one another, resulting in a relatively uniform intra- testicular temperature, below body core temperature, that is essential for normal sperm production. The scrotum substantially increased intratesticular temperature, but scrotal surface temperature was not significantly affected by the presence of a testis. MenosA novel model was used to determine the roIe of the scrotum and testes in scrotal/testicular thermoregulation in bulls and rams. Eleven yearling bulls and 12 yearling rams were used at an ambient temperature of 15°C. The distal lateral aspects and entire ventral part of the scrotum were incised under caudal epidural analgesia (xylazine, 0,07 mg ml-1. Both testes were withdrawn from the scrotum, the vaginal tunic was removed and one testis was replaced in the scrotum. Surface and internaI temperatures were measured with infrared thermography and needle thermocouples, respectively. Temperature gradients (difference in temperature from top to bottom; °C) for bulls and rams, respectively, Were: scrotal surface (with replaced testis) 2.1 and 3,5; scrotal surface (without testis) 2.5 and 3.6; scrotal subcutaneous (with replaced testis) 1,0 and 0.7; testicular subtunic (without scrotum) - 0.7 and - 0.3; deep intratesticular (with scrotum) - 0.2 and - 0.6; and deep intratesticular (without scrotum) - 0.5 and - 0.5. Results supported the hypotheses that the scrotum has a positive temperature gradient (warmer at the top than the bottom) and that the testis has a negative temperature gradient (warmer at the bottom than the top), These opposing gradients apparently complement one another, resulting in a relatively uniform intra- testicular temperature, below body core temperature, that is essential for normal sperm production. The scrotum substantially increased intratesticular temperat... Mostrar Tudo |
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Palavras-Chave: |
Saco escrotal; Termoregulacao; Testiculos. |
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Thesagro: |
Ovino; Reprodução. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02185naa a2200205 a 4500
001 1516533
005 1997-03-07
008 1996 bl uuuu u00u1 u #d
100 1 $aKASTELIC, J. P.
245 $aContribution of the scrotum and testes to scrotal and testicular thermoregulation in bull and rams.
260 $c1996
520 $aA novel model was used to determine the roIe of the scrotum and testes in scrotal/testicular thermoregulation in bulls and rams. Eleven yearling bulls and 12 yearling rams were used at an ambient temperature of 15°C. The distal lateral aspects and entire ventral part of the scrotum were incised under caudal epidural analgesia (xylazine, 0,07 mg ml-1. Both testes were withdrawn from the scrotum, the vaginal tunic was removed and one testis was replaced in the scrotum. Surface and internaI temperatures were measured with infrared thermography and needle thermocouples, respectively. Temperature gradients (difference in temperature from top to bottom; °C) for bulls and rams, respectively, Were: scrotal surface (with replaced testis) 2.1 and 3,5; scrotal surface (without testis) 2.5 and 3.6; scrotal subcutaneous (with replaced testis) 1,0 and 0.7; testicular subtunic (without scrotum) - 0.7 and - 0.3; deep intratesticular (with scrotum) - 0.2 and - 0.6; and deep intratesticular (without scrotum) - 0.5 and - 0.5. Results supported the hypotheses that the scrotum has a positive temperature gradient (warmer at the top than the bottom) and that the testis has a negative temperature gradient (warmer at the bottom than the top), These opposing gradients apparently complement one another, resulting in a relatively uniform intra- testicular temperature, below body core temperature, that is essential for normal sperm production. The scrotum substantially increased intratesticular temperature, but scrotal surface temperature was not significantly affected by the presence of a testis.
650 $aOvino
650 $aReprodução
653 $aSaco escrotal
653 $aTermoregulacao
653 $aTesticulos
700 1 $aCOOK, R. B.
700 1 $aCOULTER, G. H.
773 $tJournal of Reproduction and Fertility$gv.108, n.1, p.81-85, 1996.
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Embrapa Caprinos e Ovinos (CNPC) |
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