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Abstract
The necessity to use a feeding at par (pair fed) to eliminate the factor intake when others variables are investigated, like in the case of influence of drug, has been studied in rats. Several parameters of the protein metabolism and serum levels of triglycerides and cholesterol, have been determined. The feeding at par (pair fed), front to "ad libitum" implies a reduction in the nitro gen absorption, and unsignificantly effect on its retention. No differences appear in nitrogen content into different organs. In relation the experimented biochemistry parameters as serum as urine its is found an increment of proteins, triglycerides and cholesterol in serum and a bigger urinary excretion of uric acid when the diet is suministrated "ad libitum" .
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