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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
02/12/2004 |
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Data da última atualização: |
01/09/2023 |
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Autoria: |
HOVE, K. |
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Título: |
Intestinal radiocalcium absorption in the goat: measurement by a double-isotope technique. |
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Ano de publicação: |
1984 |
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Fonte/Imprenta: |
British Journal of Nutrition, v. 51, n. 1, p. 145-156, Jan., 1984. |
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DOI: |
https://doi.org/10.1079/BJN19840016 |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: Intestinal radiocalcium absorption was measured in goats by a double-isotope technique involving injection of 45CaCl2 intravenously and 47CaCl2 into the abomasum. Cumulative absorption of radiocalcium was calculated by deconvolution analysis form curves of plasma radioactivity. Repeated measurements at 2 d intervals gave highly reproducible results (r 0.94, P less than 0.001). No systematic difference between two consecutive measurements was observed. A good agreement between absorption of radiocalcium from simultaneously administered 47CaCl2 and 45Ca-labelled hay (r 0.93, P less than 0.001) seems to justify the use of inorganic 47Ca as a tracer for Ca in ruminant diets. Two- to three-fold increases in radiocalcium absorption 48 h after oral treatment with 1,25-dihydroxycholecalciferol or leaves of Solanum malacoxylon showed the usefulness of the method in situations of rapidly changing Ca absorption. Endogenous adaptations in intestinal radiocalcium absorption from 20 to 43% were observed in lactating goats when Ca intakes decreased from 12 to 4 g/d. It is concluded that the double-isotope technique is a suitable method for studies of Ca absorption in ruminants when tracer is introduced into the abomasum. The test is completed in 3-4 h and may therefore be used in situations where the absorption of Ca undergoes rapid changes. |
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Palavras-Chave: |
Drug effects; Radioisotopes. |
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Thesaurus Nal: |
Calcitriol; Calcium; Endocrinology; Goats; Lactation; Pharmacology; Pregnancy. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 02056naa a2200241 a 4500
001 1530847
005 2023-09-01
008 1984 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1079/BJN19840016$2DOI
100 1 $aHOVE, K.
245 $aIntestinal radiocalcium absorption in the goat$bmeasurement by a double-isotope technique.$h[electronic resource]
260 $c1984
520 $aAbstract: Intestinal radiocalcium absorption was measured in goats by a double-isotope technique involving injection of 45CaCl2 intravenously and 47CaCl2 into the abomasum. Cumulative absorption of radiocalcium was calculated by deconvolution analysis form curves of plasma radioactivity. Repeated measurements at 2 d intervals gave highly reproducible results (r 0.94, P less than 0.001). No systematic difference between two consecutive measurements was observed. A good agreement between absorption of radiocalcium from simultaneously administered 47CaCl2 and 45Ca-labelled hay (r 0.93, P less than 0.001) seems to justify the use of inorganic 47Ca as a tracer for Ca in ruminant diets. Two- to three-fold increases in radiocalcium absorption 48 h after oral treatment with 1,25-dihydroxycholecalciferol or leaves of Solanum malacoxylon showed the usefulness of the method in situations of rapidly changing Ca absorption. Endogenous adaptations in intestinal radiocalcium absorption from 20 to 43% were observed in lactating goats when Ca intakes decreased from 12 to 4 g/d. It is concluded that the double-isotope technique is a suitable method for studies of Ca absorption in ruminants when tracer is introduced into the abomasum. The test is completed in 3-4 h and may therefore be used in situations where the absorption of Ca undergoes rapid changes.
650 $aCalcitriol
650 $aCalcium
650 $aEndocrinology
650 $aGoats
650 $aLactation
650 $aPharmacology
650 $aPregnancy
653 $aDrug effects
653 $aRadioisotopes
773 $tBritish Journal of Nutrition$gv. 51, n. 1, p. 145-156, Jan., 1984.
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Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
