Abstract
THE nematode parasite causing ‘gapes’ in poultry and game birds—Syngamus trachea—has in the past been the subject of intense enquiry. This parasite is probably one of the most important causes of losses to rearers of game birds. The only reliable remedy so far has been barium antimonyl tartrate powder. This, however, has dangers, as pointed out by Clapham1. Phenothiazine has also been used as an anthelmintic1, but this only attacks the larval stages in the intestine and eventually causes keratitis in the birds2. Recently a new drug, thiabendazole, has shown promise as an efficient anthelmintic against Syngamus3,4, but no trials with pheasants in Britain had been carried out.
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