Digestibility studies of channel catfish were conducted with purified rations and commercial catfish feeds. The chromium oxide indicator method used in this study appeared to be satisfactory for determining apparent protein digestibility in foods with channel catfish. Desirable features of our procedure were that the fish consumed food approximating 2% of body mass voluntarily and feces for determining digestion coefficients were collected exclusively from the rectum. Derived digestion coefficients with practical diets indicated that digestion coefficients in livestock feeding tables for concentrated feedstuffs may be applied to catfish feeds.
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Smith et al. (1973) studied this question.