Cannulation of ductus deferens of the boar: a surgical technique.

A cannula and collection system are described which permitted collection of semen directly from the epididymis via the ductus deferens from conscious boars while also simultaneously collecting semen via the ejaculation process. The cannula consisted of silicone rubber tubing that was surgically inserted into the ductus deferens 10 to 12 cm from the end of the cauda epididymidis. Cannulas were successfully used in 4 boars. Average daily output of spermatozoa was 11.2 times 109 and 12.4 times 109 from cannulated side and intact side, respectively.