This article reminded me of a story I heard second hand. In the Karoo of South Africa, sheep farmers provided lambs with feed containing the ground up stomaches

This article reminded me of a story I heard second hand. In the Karoo of South Africa, sheep farmers provided lambs with feed containing the ground up stomaches of older sheep who lived in the area. If this was not done, then the lambs would fail to thrive when grazing. Presumably the ingested intestines transmit bacteria conferring the ability to digest otherwise indigestible material.