... because of its role both in the processes of digestion and absorp-tion and in the expression of voluntary feed consumption.The Nature of DigestaThe ruminant GI tract consists of a succession of ... estimates to be made of the partition of digestion, i.e. the extent of digestion, absorption and/or secretion occurring in defined segments of thetract.Rate of passage is a measure of the time during ... as much as80–90% of the variation in digesta flow (Faichney, 1975b; MacRae, 1975).Measurement of Rate of PassageMeasurement of the MRT of a digesta component in a segment of the GI tractrequires...