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Abstract
This study demonstrates that the temporal pattern of incorporation of a labeled lipid precursor (Acetyl‐CoA (1‐C14)) in the liver, fat body and testis of the frog may vary during the reproductive cycle. The magnitude of this incorporation is greater in the intact autumn frogs in which the liver is the first organ to show peak lipid labeling, followed in time by the peak labeling of the fat body lipids and finally of the testis lipids. In other periods of the year this precise time sequence of incorporation is either absent or not so clear. The blood lipids are also labeled rapidly, but the amount of radiolabel incorporated usually declines significantly 3 hrs after tracer injection. Results obtained in the frogs deprived of both the fat bodies, or both the testes, or one fat body and/or testis showed that the fat bodies represent a necessary anatomical step for liver lipids en route to the testis, the blood being the main channel between the liver and the fat body.