Does anyone have any idea of what could make chuckars continue to make a slurping sound even after treatment? I have given them piperazine and still they make this slurping/chocking sound. Also, put copper in their water and still the problem is here. This started around summer time. Now that it's winter and after having all the treatments I expected the slurping sound to be all gone , but no it's still there. Pieces of garlic were also put in the food, since I came across the advice on the web.