Abstract
The efficacy of piperazine dihydrochloride (Ascarex D, Rexolin Chemicals AB, Helsingborg, Sweden) was evaluated against natural infections of Ascaridia galli in broiler breeders. The compound was administered in the drinking water at a concentration of 1 or 2%. Efficacy against mature A. galli in controlled anthelmintic tests was 83%, 94% and 100% in birds given 64, 100 and 200 mg/kg body weight of drug respectively. Efficacy against immature worms was 86%, 60% and 100%. In a trial conducted in the field the frequency of fowls which were positive for nematode eggs was reduced from about 50% to 3% following treatment. Egg production in the field trial did not fall and there were no other side-effects associated with use of the drug.
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