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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: |
01/12/2023 |
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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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Thesaurus Nal: |
Ewes; Lambing; Ruminant nutrition; Sheep feeding. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 01835naa a2200265 a 4500
001 1523705
005 2023-12-01
008 1966 bl uuuu u00u1 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 $aEwes
650 $aLambing
650 $aRuminant nutrition
650 $aSheep feeding
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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Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
