High SF for PRQ than IRQ strongly supports the view that grazing ruminants adapted to poor quality roughages retain solid digesta for extended periods of time.
Lastly, based on in-sacco degradability obtained in this study, DM loss at 24 h was approximately 35% (PRQ) and 46% (IRQ).
The rate of decrease of DM load and proportion of DM load with time after feeding was greater for the IRQ compared to PRQ.
Based on the exponential curve, the high rate at which the proportion of IRQ disappeared is supported by the observed higher degradation rate of IRQ than PRQ.
Goats and sheep fed on IRQ had low abomasum digesta load than those fed on PRQ.
IRQ, improved roughage quality; PRQ, poor roughage quality