Asian-Australasian Journal of Animal Sciences
- Volume 11 Issue 4
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- Pages.351-362
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- 1998
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- 1011-2367(pISSN)
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- 1976-5517(eISSN)
DOI QR Code
A Comparison of Ammonia and Preformed Protein as a Source of Nitrogen for Microbial Growth in the Rumen of Sheep Given Oaten Chaff
- Kanjanapruthipong, J. (Department of Animal Science, Kasetsart University) ;
- Leng, R.A. (Department of Animal Science, University of New England)
- Received : 1997.09.24
- Accepted : 1997.12.17
- Published : 1998.08.01
Abstract
Microbial growth efficiency in the rumen was studied in sheep given hourly, 31.25 g oaten chaff with either 0.31 and 0.88 g urea or 1.88 and 5.63 g casein (exp. 1) and 33.33 g oaten chaff with 1.04 casein or 0.3, 0.6 and 0.9 g urea or the mixture of the casein and urea (exp. 2). Concentrations of ruminal fluid ammonia increased with increasing nitrogenous supplements. Organic matter digestibility in sacco in the rumen was not different irrespective of N sources. Isoacids and valeric acid increased with increasing ingested casein but decreased with increasing urea intake. Peptide and amino acid pools in ruminal fluid increased with increasing ammonia concentrations (exp. 2) suggesting that proteolytic activity and transportation of peptides and amino acids across microbial membrane of rumen microbes may be regulated by the metabolite mechanism (intracellular amino acids and