A favourite method on the Continent, and in vogue in some parts of Scotland and Wales, is that of twisting and drawing out the artery until its coats break and all possibility of haemorrhage is precluded.
To castrate in this manner, the animal has to be cast in the way previously described, and the testicle let out of the purse by the knife. The posterior or non-vascular portion of the cord is then divided, leaving the testicle suspended by the vascular portion alone. The cord is then secured in the clamp above the epididymus. This portion is now seized by the 'fixing forceps" (fig. 519), which are firmly held by an assistant (Plate LVI, fig. 2). The operator now seizing the cord still nearer the testicle by the "moving forceps" (fig. 520), twists the intervening portion round and round from left to right until all the structures break away, and the testicle is removed. It is an operation requiring more skill than the method previously described, and occupies more time. If the traction and twisting are too quickly executed, the vessel may be broken before its coats are sufficiently torn and separated from each other (the object sought) to stop the bleeding.
Fig. 519. - Fixing Forceps for Castration by Torsion.
Fig. 520. - Torsion Forceps.