The Helminth Parasites of Domesticated Birds in Mid Wales.

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Abstract
1. The lower intestinal tracts (duodenum to rectum) of 267 adult domestic fowls were examined for helminth parasites and 91% were found to be infested. The average numbers of worms and species present in infested birds were 240.6 and 2.42 respectively. Twelve species of parasites were recovered but only 5 occurred in more than 20% of the birds. 2. Twenty-six casualty and diseased chickens between 2 and 12 weeks old were examined. Fourteen were infested with helminth parasites and the average infestation was 499.9 worms of 2.79 species. 3. The total numbers of worms of all species present in individual fowls were shown to bear a relationship to the number of species comprising the infestations. Linear and quadratic equations which demonstrate the relationship have been derived from the observed figures.