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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
12/09/1995 |
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Data da última atualização: |
12/09/1995 |
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Autoria: |
PEARSON, R. M.; SMITH, J. A. B. |
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Título: |
The utilization of urea in the bovine rumen. 2. The conversion of urea to ammonia. |
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Ano de publicação: |
1943 |
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Fonte/Imprenta: |
Biochemistry Journal, v.37, p.148-153, 1943. |
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Idioma: |
Inglês |
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Conteúdo: |
1. In the utilization of urea by dairy cattle the first stage is probably the conversion of urea
to NH3 in the rumen.. Moreover, the urease activity of the rumen ingesta is so great at all
times of the days, wheatever the time of feeding, and remains so little affected by relative-
ly large amounts of urea, that all the urea likely to be fed, event to a high yielding cow in
full lactation, would readily be converted to NH3 within 1 hr. This fact has been confirmed
by Wegner, Booth, Bohstedt & Hart [1941], who found a marked increase in N.P.N. and
NH3 in the rumen after a urea meal but were unablke to detect urea it self.
2. The urease of the rumen resembles, in activity, that from soya and jack beans. Chan-
ges in its activity with changes in temperature and pH, and its behaviour in the presence
of such inhibitors as quinone and NaF, are typical of enzymes of the urease type. Prelimi-
nary attempts to obtain enzyme preparations free bacteria have, however, proved unsuc-
cessfull. |
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Palavras-Chave: |
Amonio; Bovine. |
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Thesagro: |
Bovino; Rúmen; Uréia. |
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Thesaurus Nal: |
ammonia; urea. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01540naa a2200217 a 4500
001 1786106
005 1995-09-12
008 1943 bl --- 0-- u #d
100 1 $aPEARSON, R. M.
245 $aThe utilization of urea in the bovine rumen. 2. The conversion of urea to ammonia.
260 $c1943
520 $a1. In the utilization of urea by dairy cattle the first stage is probably the conversion of urea to NH3 in the rumen.. Moreover, the urease activity of the rumen ingesta is so great at all times of the days, wheatever the time of feeding, and remains so little affected by relative- ly large amounts of urea, that all the urea likely to be fed, event to a high yielding cow in full lactation, would readily be converted to NH3 within 1 hr. This fact has been confirmed by Wegner, Booth, Bohstedt & Hart [1941], who found a marked increase in N.P.N. and NH3 in the rumen after a urea meal but were unablke to detect urea it self. 2. The urease of the rumen resembles, in activity, that from soya and jack beans. Chan- ges in its activity with changes in temperature and pH, and its behaviour in the presence of such inhibitors as quinone and NaF, are typical of enzymes of the urease type. Prelimi- nary attempts to obtain enzyme preparations free bacteria have, however, proved unsuc- cessfull.
650 $aammonia
650 $aurea
650 $aBovino
650 $aRúmen
650 $aUréia
653 $aAmonio
653 $aBovine
700 1 $aSMITH, J. A. B.
773 $tBiochemistry Journal$gv.37, p.148-153, 1943.
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Registro original: |
Embrapa Pantanal (CPAP) |
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