The Neosem insemination system from Cobiporc has the semen inside a flexible translucent sleeve on the 70ml dose container. This sleeve reduces in size as the semen is taken into the sow giving the inseminator a clear view of the progress of auto-insemination on each animal. The container inserts to the end of the catheter by a quick push-on action. The length of this tube is adjustable simply by snapping off one or more calibrated portions at its tip, to suit use on gilts and sows.