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Glycogen has been demonstrated in non-germinal cells of the testes in many species (Free, 1970). In the rat, however, the Sertoli cells and the interstitial cells are characterized by the absence of glycogen (Nicander, 1957; Leiderman & Mancini, 1969). The germinal cells are the major sites for the deposition of glycogen and their content declines progressively from the immediate postnatal period to adult-hood (Leiderman & Mancini, 1969). As atrophic testes resulting from irradiation consist largely of non-germinal cells (Ellis, 1970), it is assumed that the changes in the glycogen levels in such testes mirror the events associated with the interstitial and Sertoli cells. Normal adult rats (150 to 200 g) were allocated to fifteen groups, with three to five rats in each group. Anaesthetized rats, without shielding, were laid in a supine position on a dissecting board. The body area inferior to the penis was exposed to a single uniformally distributed dose of y-rays at a distance of 65 cm from the source within a field of exposure of 25 25 cm2 (Gupta & Bawa, 1971). Immediately outside the field of exposure, y-ray scattering was undetectable by phantom dosimetry. Sham-irradiated animals acted as controls. Feeding was stopped 6 to 8 hr before the rats were killed by decapitation. Estimations were carried out, in duplicate, using 200 to 400 mg pooled tissue from a group. The tissue was added directly to hot 30 % potassium hydroxide, and the glycogen was extracted and analysed by the method of Seifter, Daton, Movie & Muntwyler (1960). Post-irradiation values for glycogen, expressed in/ig/g testis and as a percentage of the control values, are shown in Text-fig. 1, and values, expressed

GLYCOGEN IN NON-GERMINAL CELLS OF RAT TESTIS FOLLOWING GAMMA-IRRADIATION