Sayyiduna Mu'adh bin Jabal (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) sent him to Yemen and commanded him: "Take the zakah of grain from grain, of goats from goats, of camels from camels, and of cattle from cattle."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7371