Surah 6. Al-An'am, Ayah 142

I.e., by superstitiously declaring as forbidden what God has made lawful to man. All the references to pre-Islamic taboos given in verses {138-140} as well as {142-144} are meant to stress the lawfulness of any food (and, by implication, of any other physical enjoyment) which God has not expressly forbidden through revelation.

 Strong cattle like camels and oxen can be used for labour, whereas smaller ones like goats and sheep are not suitable for labour but are good for their meat, milk, hide, etc.

Superstition kills true religion. We come back to the Arab Pagan superstitions about cattle for food. The horse is not mentioned, because horse flesh was not an article of diet and there were no superstitions about it. Sheep and goats, camels and oxen were the usual sources of meat. Sheep and goats were not used as beasts of burden, but camels (of both sexes) were used for carrying burdens, and oxen for the plough, though cows were mainly used for milk and meat. The words "some for burden and some for meat" do not differentiate whole species, except that they give you the first two and the last two categories.