When Head is Out: Stop.

When Head is Out: Stop.
As soon as the head is out, stop pulling. The assistants switch to pulling on the opposite leg and the obstetrician places one arm and hand all the way underneath the calf and inserts the other hand between the legs, and folds the fingers above the head, locking them with the fingers of the other hand. When the cow strains, he orders the assistants to pull while he pulls the head towards his / her knees thereby rotating the calf and the hips (as illustrated in the next image).

Utrecht (1976)