Linnaeus collected 643 different plant species that were then fed to horses, cows, pigs, sheep and goats. The results were carefully compiled but not analyzed until now, 275 years later.
The results show that pigs were the most selective, eating 32% of the 204 plant species tested on all the animals. This was followed by horses at 59%, cows at 66%, sheep at 82% and goats at 85%.