Milk from grass-fed cows. In Ireland, cows graze on the green pastures of small family farms. This milk is churned to make Kerrygold pure Irish butter. Made with milk from grass-fed cows not treated with rBST or other growth hormones (no significant difference has been shown between milk derive from rBST-treated and non rBST-treated cows). www.kerrygoldusa.com. Product of Ireland.