Analysis of nematode infection levels among indoor pigs in Thika District, Kenya

The infection levels of various species of nematode infection were studied in 35 indoor pig herds in Thika district, Kenya. Faecal samples were collected from 830 pigs of all ages and examined for nematode eggs per gram (EPG) of faeces using a modified McMaster technique. The infection intensity exhibited a binomial distribution with a majority of animals having only a light infection (EPG range = 0-500). The level of nematode infections was associated with the age of pigs. Thus, the highest mean EPG levels of Oesophagostomum spp. was 218 (SE = ±34), Ascaris suum 215 (SE = ±62), Trichuris suis 155(SE = ±66) and Strongyloides ransomi 24(SE = ±6) were found in adults, weaners, porkers and piglets respectively. The widest individual nematode species range of EPG values was found in T. suis (0 - 10,000) and A. suum (0 - 5300) infections. It is possible that the low EPG levels could be due to aggressive helminth control by local farmers. This could increase costs and possibly lead to the emergence of anthelmintic resistance. To reduce these costs, it is recommended that animals should be treated after faecal examination and laboratory determination of the EPG levels.. Kenya Veterinarian Vol. 31 (2) 2007: pp. 54-58