Much more money to be made by the big boys in human medicine...

Much more money to be made by the big boys in human medicine rather than in animal health. A major may well takeover a "backyarder" though if they have a good product or at least form an alliance to market the product. For example BTA with GlaxoSmith Kline (and stuff it up)

An example of the potential profitability of human vs animal is Norvet changing to Novogen, which is why the code for Novogen on the ASX is NRT.