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The Physiological Approach to Livestock Nutrition Problems¹

Cornell University

Abstract

At the outset I should indicate what I mean by this title. I refer to studies of what goes on inside the animal body with a given ration as distinguished from measuring the response merely in terms of increase in weight or product. This involves a consideration of the chemical changes which the nutrients of a feed undergo from ingestion to excretion, and the physiological and biochemical changes of the organs and tissues concerned. It is self-evident that feeding trials under conditions of practice, involving records of the market products obtained, whether meat, milk, wool or eggs, have made large contributions to the improvement of feeding practice. They will continue to be useful, and essential as the final practical test for the results obtained by any other method of experimentation.

¹ Presented before the Opening Session of the 34th Annual Meetings of the Amer. Soc. of Animal Production. Chicago. Nov. 28, 1941.