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Abstract
Extract
Roy and Rowson (1955) described a method of inducing sterility in the cow by inserting a stainless steel spring into the cervix. They used six cows which were slaughtered 5 to 6 months after the insertion of the springs. Only one was pregnant with a 3 to 4 months' foetus, but in this case the spring was recovered from the vagina. Fertilized ova were recovered from two cows and from one a degenerated blastocyst. One of the remaining cows was not pregnant and the other had an unfertilized egg in the oviduct. From these results: they concluded that the springs caused sterility by preventing implantation. No gross morphological changes were noticed in the reproductive tracts.