For his 18th century thesis, Carl 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, when they were also published in the Biological Journal of the Linnean Society. For his 18th century thesis, Carl 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, when they were also published in the Biological Journal of the Linnean Society. Plants & Animals Agriculture Phys.org – latest science and technology news stories