Supplementing diets with formic acid, benzoic acid,
sorbic acid, or normal coated or inulin coated butyric
acid did not affect skatole or indole levels or organic
acid levels in colon of entire male pigs. Formic acid or
benzoic acid supplemented diets resulted in lower
plasma skatole levels than the control or the sorbic
acid supplemented diets. Adding formic acid, benzoic
acid, sorbic acid to diets for entire male pigs reduced
microbial population in the gastro-intestinal tract, but
this did not coincide with changes in skatole production
in the hind-gut.