Cats have been around the farmstead as long as there has been farm dwellings. Usually, barn cats are half wild and rarely depend on the farmer for the main portion of their feed requirements. They catch rats, snakes, small feed birds and often, just the existence of cats on a farm will discourage a large rodent population. This very utilitarian skill is the culprit of toxo contamination. Usually toxo is most prevalent in half-grown kittens when fed a mainstay diet of raw meats, particularly rodents.
Cats are clean with their litter, soiling an area then covering it up is quite normal.
However, if their litter is contained in an area where your pregnant animals are routinely housed, they are bound to come in contact with some fecal matter. For example, goats, sheep, llamas, etc., are close herd animals by nature, and where one makes her bed, several will join her to lie in it. Eating a wisp of straw that a cat recently walked across, after having scraped over a fecal site is another way to develop toxo in an animal. The outward signs are similar to a mild case of the flu. Dullness, aching, watery eyes, slightly elevated temperature, etc.