In situ rumen incubation and post-rumen mobile nylon bag technique, and in vitro enzymatic procedure are currently used for estimating ruminal and post-ruminal disappearance of feed protein (Danesh Mesgaran and Stern, 2005). The objectives of the present study was to determine the ruminal and post-ruminal protein disappearances of various feed protein sources containing different oil concentrations, using in situ rumen incubation and post-rumen mobile nylon bag technique, and an in vitro enzymatic procedure.

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