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Ruminal peptide and ammonia nitrogen concentrations in steers fed diets with different concentrate to lucerne hay ratios

Published online by Cambridge University Press:  23 November 2017

Alireza Vakili*
Affiliation:
Ferdowsi University (Excellence centre for Animal Science), Mashhad, Iran
Mohsen Danesh Mesgaran
Affiliation:
Ferdowsi University (Excellence centre for Animal Science), Mashhad, Iran
Reza Valizadeh
Affiliation:
Ferdowsi University (Excellence centre for Animal Science), Mashhad, Iran
Alireza Heravi Moussavi
Affiliation:
Ferdowsi University (Excellence centre for Animal Science), Mashhad, Iran
Mohammad Reza Nassiry
Affiliation:
Ferdowsi University (Excellence centre for Animal Science), Mashhad, Iran
Ali Hosseinkhani
Affiliation:
Ferdowsi University (Excellence centre for Animal Science), Mashhad, Iran
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Extract

In ruminants, as much as 50% of the dietary crude protein can be converted to ammonia by ruminal microorganisms. A part of ammonia can be utilized as a bacterial nitrogen source; however, rates of ammonia production often exceed rates of ammonia utilization. Peptides are intermediates in the conversion of ingested protein to ammonia in the rumen and their accumulation depends upon the nature of diet (Mesgaran & Parker, 1995). The objective of the present experiment was to investigate the effect of diets differing in concentrate: lucerne hay ratios on the ruminal pH, ammonia-nitrogen concentration and ruminal peptide nitrogen concentration in Holstein steers.

Type
Poster Presentations
Copyright
Copyright © The British Society of Animal Science 2007

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References

Chen, G., Russell, J. B. and Sniffen, C. J. 1987. A procedure for measuring peptides in rumen fluid and evidence that peptide uptake can be a rate-limiting step in ruminal protein degradation. Journal of Dairy Science. 70: 1211–1219.CrossRefGoogle ScholarPubMed
Mesgaran, M. D. and Parker, D. S. 1995. The effect of dietary protein and energy sources on ruminal accumulation of low molecular weight peptides in sheep. Animal Science. 60: 535 (abstr).Google Scholar