Data/hora: 15/06/2024 17:49:37

Biblioteca(s): 	Embrapa Pantanal.	
Data corrente: 	12/09/1995	
Data da última atualização: 	12/09/1995	
Autoria: 	PEARSON, R. M.; SMITH, J. A. B.	
Título: 	The utilization of urea in the bovine rumen. 2. The conversion of urea to ammonia.	
Ano de publicação: 	1943	
Fonte/Imprenta: 	Biochemistry Journal, v.37, p.148-153, 1943.	
Idioma: 	Inglês	
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.	
Palavras-Chave: 	Amonio; Bovine.	
Thesagro: 	Bovino; Rúmen; Uréia.	
Thesaurus Nal: 	ammonia; urea.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Pantanal (CPAP)	
Exemplares: 	CPAP - (29676-1) - ADD - SP - -- - SP1151 -  - 1151 - DIS