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1. After a meal of meat (10g/kg), urea excretion in dogs increased by about 200%, plasma urea by 60% and exogenous creatinine clearance by 40% in comparison with control experiments. 2. Urea, given by stomach tube in doses producing the same increase in plasma urea, caused urea excretion to increase by only 90%, with no increase in creatinine clearance. With the increased glomerular filtration rate after meat there was added excretion of urea. 3. In control experiments and after urea, the rate of excretion of urea was directly proportional to plasma urea. The ratio urea clearance/creatinine clearance, was 0-45. 4. After meat, urea clearance increased more than creatinine clearance, the ratio increasing to 0-55, i.e. a smaller fraction of the filtered urea was re-absorbed after meat. 5. After meat, 10g/kg, the rate of urea production rose to 230-600 mumole/min for 4-6 hr.

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