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B. LOFTS and R. K. MURTON

Summary.

A single intra-muscular dose of cadmium chloride (0·2 ml of a 0·04 m solution) caused a retardation of the photoperiodic response in the testes of wood-pigeons (C. palumbus) given a 16-hr photoperiod in late February to March. A similar injection administered in August did not affect the normal seasonal post-nuptial regression. Necrosis of the seminiferous tubules was not evident.

An intra-muscular injection given to feral pigeons (C. livia) with testes in full breeding condition, again produced no necrosis of the seminiferous tubules, but interfered with the radial co-ordination of cells in the germinal epithelium.

An intra-testicular injection (0·1 ml of 0·04 m solution) of cadmium chloride into specimens of both species, caused localized necrotic damage as well as a more general disruption of germ-cell co-ordination in the seminiferous epithelium.

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B. LOFTS, R. K. MURTON and R. J. P. THEARLE

In recent years, attention has been focused on the potential of reproduction inhibitors for the possible control of harmful birds (Davis, 1961, 1962; Elder, 1964; Becker, 1966). Elder, in his search for an effective avian oral contraceptive, found that the best results were obtained with a hypocholesterolemic agent, 22,25-diazacholesterol dihydrochloride (compound SC-12937, Searle & Co., Chicago). When this constituted 0·1% of the diet of pigeons for 10 days, ovulation was inhibited for 3 months and impaired for a further 3 to 9 months. The present study was designed to investigate the effects of compound SC-12937 on the pre-incubatory behaviour of Columba livia and to assess the action of the drug on normal testis cytology.

Males and females in two groups, each of