Abstract

1. 1. The rate of passage of chromic oxide (Cr) was similar in the pony and rhinoceros. 2. 2. Higher apparent amounts digested were found using 4N-HCl-insoluble ash (AIA) than those determined by Cr. but overall digestibilities were similar for the two species. 3. 3. An abrupt increase in the starch content of the horse diets increased the number of faecal ciliate protozoa. Only when the overall feed intake was increased in horses receiving a high dietary proportion of starch were the numbers depressed. 4. 4. When the rhinoceros received 109 kJ apparent DE per kg bodyweight daily (716 kJ/W 0.75 dailyl it maintained normal condition.

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