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SUMMARYA quantitative histological study of the early changes in the testes of 8 weanling rats fed a zinc-deficient diet ( 0 . 5 p.p.m. Zinc) was made. Eight control rats, pair-fed to the deficient rats, received 30 p.p.m. of Zinc. The earliest statistically significant change is the diminution of elongated stage 3 spermatids (Roosen Runge's classification) after 23 days of zinc deficient diet. Since the number of stage 6 round spermatids after i6 days of diet was not statistically different from the pair-fed control, it indicates that the earliest effect of zinc deficiency on the testis, is an inhibition of the transformation of round spermatids into elongated ones. These results are discussed in relation to the possible role of zinc on spermatogenesis.

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