Abstract
Ration particle size has been observed to affect DMI, chewing activity, rumen pH, milk fat and nutrient digestibility (Yang et al., 2001; Grant et al., 1990). Nonforage fiber sources (NFFS) possess a large amount of NDF that can be used as a forage substitute based on their price and availability. Cottonseed hulls (CSH), a by-product of cotton processing, contain a large proportion of NDF and associated lignin, and have been considered a useful NFFS. It was suggested that physical characteristics of dietary forage can interact with nonforage fiber sources (Grant, 1997). The objectives of this study were to determine effects of CSH as nonforage fiber sources and to investigate interaction between CSH as NFFS and alfalfa particle size on Chewing Activity and rumen pH.
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