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A TECHNIQUE FOR ELECTRO-EJACULATION IN CHINCHILLAS

This technique was standardized on chinchilla (Chinchilla laniger) as part of two wider projects: (a) to investigate a method for artificial insemination (Weir, 1966), and (b) an electron microscope study of the spermatozoa.

Dalziel & Phillips (1948) used unipolar lumbar-anal electrodes on both guinea-pigs and chinchillas, Scott & Dziuk (1959) reported success with bipolar rectal electrodes on rats, mice and guinea-pigs. Hillemann, Gaynor & Dorsch (1963) described an electro-ejaculation method in chinchilla, but gave no details of the electrode or of the voltage used (Table 1).

Some of the sixty-four chinchillas used were those already in our colony and the rest were kindly lent by two chinchilla ranchers. The electrode was a multiring type (Healey & Sadleir, 1966) 12 cm long x 6·5 mm in diameter with 2·5 mm brass rings separated by