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THE CONSTRUCTION OF RECTAL ELECTRODES FOR ELECTRO-EJACULATION

The technique of electro-ejaculation is now commonly used for the collection of semen from some domesticated species and is currently being applied in this Institute to exotic species of differing sizes. This note describes the construction of several types of rectal electrodes which we are using in the development of semen collection techniques. Originally a single rectal pole in combination with a needle pole inserted in the lumbar muscles was used by Gunn (1936) for electro-ejaculation of the ram. Laplaud & Cassou (1945) did not describe the bipolar rectal electrode which they used on rams but later Thibault, Laplaud & Ortavant (1948) gave details of a multipolar electrode having thirty brass rings, separated by vulcanite rings, for use on bulls. Blackshaw (1954) described a four-electrode pole for rams made from copper tubing covered with