In two-choice feed preference tests, growing swine selected an alfalfa-free diet over diets containing alfalfa at alfalfa levels of 1% and higher. They selected diets containing low saponin alfalfa over the same dietary level of high saponin alfalfa, but rejected both in favor of an alfalfa-free diet. In a similar two-choice test, swine discriminated against quinine sulfate at all dietary levels above.05%.
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LeaMaster et al. (1979) studied this question.