Using I131-albumin tracer methods, albumin breakdown rates were estimated in 7 rabbits following extensive gastrointestinal resection, including 5 with nearly complete enterectomy, 1 with total gastroenterectomy, and 1 with gastrectomy only, and in 4 sham operated rabbits. Breakdown rates in the resected animals varied from 48 to 187 per cent of the corresponding controls, with an average of 96 per cent. It is concluded that no more than one-half, and probably much less, of albumin breakdown occurs in the gastrointestinal tract.

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