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Registro Completo |
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Biblioteca(s): |
Embrapa Amazônia Ocidental. |
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Data corrente: |
04/02/2015 |
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Data da última atualização: |
04/02/2015 |
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Autoria: |
GRAHAM, N. McC.; SEARLE, T. W. |
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Título: |
Some effects of nutrition and heat stress on urea excretion by pregnant sheep. |
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Ano de publicação: |
1966 |
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Fonte/Imprenta: |
Australian Journal of Agricultural Research, v. 17, n. 3, p. 347-353, 1966. |
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DOI: |
10.1071/AR9660347 |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: Renal clearance of urea and creatinine were measured at mating time and near lambing time in three groups of seven sheep, the groups being given differing amounts of food. On each occasion the measurements were made at normal ambient temperature (20°C) and in a hot environment (35°). The ewes on the lowest feeding level were severely undernourished in late pregnancy. Urine flow and the composition of blood and urine were quite variable, with standard deviations equal to 10?20% of mean values. Renal clearance of urea was greater at the highest feeding level (29?41 ml/min) than at the other levels (19?26 ml/min). Heat stress caused it to increase by 6?12 ml/min at mating time but had no effect in advanced pregnancy. Actual excretion of urea varied similarly. Urea clearance was a relatively constant fraction of creatinine clearance (40?50%).? It is concluded that apparent nitrogen economy or urea conservation by the pregnant ewe subjected to heat stress or caloric undernutrition is not evident at the renal level. It is suggested rather, that nitrogenous moieties of oxidized protein may be re-utilized. |
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Palavras-Chave: |
Estresse. |
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Thesagro: |
Nutrição; Ovino; Prenhez; Reprodução; Uréia. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01725naa a2200217 a 4500
001 2007703
005 2015-02-04
008 1966 bl --- 0-- u #d
024 7 $a10.1071/AR9660347$2DOI
100 1 $aGRAHAM, N. McC.
245 $aSome effects of nutrition and heat stress on urea excretion by pregnant sheep.
260 $c1966
520 $aAbstract: Renal clearance of urea and creatinine were measured at mating time and near lambing time in three groups of seven sheep, the groups being given differing amounts of food. On each occasion the measurements were made at normal ambient temperature (20°C) and in a hot environment (35°). The ewes on the lowest feeding level were severely undernourished in late pregnancy. Urine flow and the composition of blood and urine were quite variable, with standard deviations equal to 10?20% of mean values. Renal clearance of urea was greater at the highest feeding level (29?41 ml/min) than at the other levels (19?26 ml/min). Heat stress caused it to increase by 6?12 ml/min at mating time but had no effect in advanced pregnancy. Actual excretion of urea varied similarly. Urea clearance was a relatively constant fraction of creatinine clearance (40?50%).? It is concluded that apparent nitrogen economy or urea conservation by the pregnant ewe subjected to heat stress or caloric undernutrition is not evident at the renal level. It is suggested rather, that nitrogenous moieties of oxidized protein may be re-utilized.
650 $aNutrição
650 $aOvino
650 $aPrenhez
650 $aReprodução
650 $aUréia
653 $aEstresse
700 1 $aSEARLE, T. W.
773 $tAustralian Journal of Agricultural Research$gv. 17, n. 3, p. 347-353, 1966.
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Embrapa Amazônia Ocidental (CPAA) |
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| 8. |  | SCHENK, M. A. M. Fotossensibilização em eqüinos. In: VALERIO, J.R.; MACEDO, M.C.M. Coletânea de seminários técnicos 1988/1991 (Resumos). Campo Grande, MS : EMBRAPA-CNPGC, 1994. p. 49 (EMBRAPA-CNPGC. Documentos, 55). CNPGC.| Biblioteca(s): Embrapa Gado de Corte. |
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