The use of lactic acid bacteria in pig feeds for the control of coliform pathogens in the intestine is now common. These “probiotic” preparations do not persist in the intestine, and must therefore be added daily. Previous work (Reid and Hillman, in press) has indicated that the proportion of Lactobacillus spp. to coliform bacteria can be affected by the type of starch included in the diet, which may provide a more cost-effective means of controlling coliform pathogens. However, the previous study found the greatest enhancement of Lactobacillus spp with waxy maize, one of the most expensive starches. Consequently, this study sets out to determine whether an enhancement of this proportion could be obtained with a more economical starch, or with mixtures of starches.