Authors
and E.C. Titgemeyer. . Elwakeel, E.A., R.G. Amachawadi, A.M. Nour, M.E.A. Nassar, T.G. Nagaraja
Publication date
2013
Journal
J. Dairy Sci
Volume
96
Issue
2013
Pages
495-505
Publisher
J. Dairy Sci
Description
The objective of these studies was to characterize some factors affecting lysine degradation by mixed ruminal bacteria and by ruminal Fusobacterium necrophorum. Mixed ruminal bacteria degraded lysine, and addition of pure cultures of F. necrophorum did not increase lysine degradation. Addition of acetic or propionic acid strikingly reduced NH3 production from lysine by mixed ruminal bacteria at pH 6, but not at pH 7. Although typical ruminal environments with acidic pH and normal concentrations of volatile fatty acids might inhibit lysine degradation by F. necrophorum, ruminal fluid contained enough bacteria with a lysine-degrading capacity to ferment 50 mM lysine in vitro. Of 7 strains of ruminal F. necrophorumtested, all grew on both lactate and lysine as the primary energy source. Both subspecies of ruminal F. necrophorum (necrophorum and funduliforme) used lysine as a primary C and energy source …
Total citations
Scholar articles
In vitro degradation of lysine by ruminal fluid-based fermentations and by Fusobacterium necrophorum
EA Elwakeel, RG Amachawadi, AM Nour, MEA Nasser… - Journal of dairy science, 2013
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