Effect of iron deficiency onTrichuris suisandAscaris suuminfections in pigs
The objective of this experiment was to detect a possible interaction between iron deficiency and intestinal nematode infections. We report on a 2×2 study where thirty-one 10-week-old pigs fed a low or a normal iron diet were infected with bothTrichuris suis(4500 eggs) andAscaris suum(1200 eggs). No significant difference was detected between diet groups with respect to parasitological parameters forA. suumor the total number of adultT. suisrecovered at necropsy 10 weeks p.i. However, in the low iron groupT. suiswere located more proximally and the worms were increased in length. A higher proportion of pigs with initial faecal egg excretion at 6 weeks p.i. was observed in the low iron group, indicating a shortened pre-patency period. Worm fecundity and total faecal egg excretion were also highest in the low iron group. A significant correlation was found between female worm length and fecundity. The peripheral eosinophil counts were diminished in the low iron host groups. The infected low iron group experienced more severe pathophysiological changes in terms of hypoalbuminaemia and decreases in erythrocyte volumes. A significant inverse correlation existed between iron content in the bone-marrow and liver (body) store. In conclusion, iron deficiency increased the severity ofT. suisinfection in pigs.