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SANCHEZ-VAZQUEZ, F. J., T. YAMAMOTO, T. AKIYAMA, J. A. MADRID AND M. TABATA. Selection of macronutrients by goldfish operating self-feeders. PHYSIOL BEHAV 65(2) 211-218, 1998.-In the wild, both food availability and an animal's requirements may fluctuate. Given the choice to feed on different diets, animals may exhibit preferences in their selection. Although macronutrient selection has been investigated...
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