I will address a little of what I know. You have presented an age old question for surely. It is daunting when there is a lot of chickens to do, and of course, in the drinking water is the easiest, but so many medications do not stay mixed in the water very well I think. Geeze, if only it was easy. I think the best bet with chickens, really, but I don’t do this, is to have a fecal count performed and find out what kind of worms are present in the chickenyard, then take it from there, would make so much sense. Piperazine ONLY gets rid of the round worms, evidently that is the only worm it has effect on. The most common in the chicken yard. Have a wonderful day, CynthiaM.
Information transcribed from this site:
https://sites.google.com/a/poultrypedia.com/poultrypedia/medicine-chartPiperazine, basically rids of round worms only. A one dose thing, i.e., withhold water for a few hours or part of the day and provide medicated water only for that time
Fenbendazole (panacur) fenbendazole is also known as Safeguard
Nematodes of the GI & respiratory tracts;
Capillaria (Capillary Worms), Heterakis (Cecal Worms), Ascaridia (Roundworms), and Syngamus spp. (Gapeworms); most worms other than some tapeworms. Giardiasis. May help with Coccidiosis. Dose of Safeguard 10% liquid:
Nematodes--0.7 cc (mL) orally, or 1 1/2 TB per gal. drinking water. Repeat once after 10 days.
Giardiasis--1.2 cc (mL) orally, or 2 1/3 TB per gal. drinking water. Repeat 3 days.
*If mix in drinking water, tends to settle at bottom of bowl. Stir frequently.
Albendazole (valbazen), roundworms, capilliaria (cecal worms, tapeworms, prettymuch all inernal parasites in poultry and possibly some worm eggs. May have effect against blackhead, coccidiosis and lower form of canker? Probably the most effective poultry dewormer. Dose .5 cc, redose after 10 days, does not stay diluted very well in drinking water, egg withdrawal needed
