1. Rate of passage of digesta through the ruminant digestive tract;Balch,1965
2. Metabolism of urea in sheep;Cocimano,1967
3. Digestive efficiency in a wild goat: The Nubian ibex;Choshniak;Can. J. Anim. Sci.,1984
4. Diminished renal urea excretion in the llama reduced food intake;Engelhardt,1976
5. Adaptation to low protein diets in some mammals;Engelhardt,1978