Sometimes it’s tiny spheres, but more often it comes in the form of a matte, whitish powder. Neither one looks particularly spectacular. And yet, it is supposed to work minor miracles – at least on the farm. What is it? Probiotics: living microorganisms such as Lactobacillales (an order of bacteria found in lactic acid) or yeast that is added to animal feed – and are then supposed to boost a pig’s health from inside its intestine.