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A method for the control of protein and energy retentions in growing rats


, : A method for the control of protein and energy retentions in growing rats. Japanese Journal of Zootechnical Science 51(6): 422-428

A method for the control of protein and energy retentions in the carcass was proposed using rats. Twelve diets were prepared by combining 4 ME [metabolizable energy] levels and 3 DCP [digestible crude protein] levels. Twelve grams of each diet was offered daily to rats. The rats were slaughtered at day 20 of experiment and protein and energy retentions were determined by carcass analysis. Regression equations between nutrient intake and nutrient retention were determined by multiple regression analysis. A figure was drawn of the relationship between ME and DCP intakes in each equation obtained by setting energy or protein retention in these regression equations to optional values; energy and protein retentions in the carcass vary in the pattern as suddle point and ridgeline of a mountain with the changes of ME and DCP intakes, respectively. The amounts of ME and DCP intakes required for making energy and protein retentions in the carcass into optional values can be determined by reading the values of ME and DCP intakes corresponding to the intersecting points of both curves of energy and protein retentions. This method can be applied to animal experiments.

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