I neither condone, recommend nor in anyway approve of this practice on any grounds what so ever. The memory,though and sight is abhorrent to me. Anything that involves animals is part of my hard limits

That said I have, unfortunately, witnessed almost what you describe, not in the western world I’m glad to report.

A transparent tube was inserted in to the female; the animal was then fed in to the tube and a cap placed over the end. The tube and cap had a number of small holes in them. The animal was then free to enter the female encouraged by a substance placed inside her first. Unlike the description you give, the animal didn’t penetrate very far and the tube was never removed for the short time I could bare to be present. It did however scratch and presumably bite as Tojo suspects.