Nutrition Discussion Forum
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چکیده
Without any doubt, the polyester-bag method is a very useful and common tool when evaluating ruminal utilization of feed. The first-order kinetic model as described by 0rskov & McDonald (1979), McDonald (1981) and Dhanoa (1988) is widespread and commonly used for description of disappearance curves. The model has two drawbacks clearly identified: (a) the assumption of fraction A being totally and quickly degraded in the rumen when it is known that solubility does not necessarily mean degradability, and (b) particulate matter loss causing bias in true disappearance from the bag. I was pleased to see in the Journal a letter from Lopez et al. (1994) where they suggested a correction for particulate matter loss (PL) when applying the polyester-bag method. They suggested the corrected disappearance calculation as:
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