1 ( 16 oz) Yak Ground Beef. 1-800-Kobe Beef. COM is proud to offer All Natural Yak Meat, which comes exclusively from a family-owned herd in Colorado. These pure-bred steers are raised naturally and humanely. "The True Natural" herd is grass fed for over "THIRTY SIX MONTHS" without the use of antibiotics or growth hormones. This natural feeding process means that the animals take an additional forty-five days to reach market. Aged for a minimum of thirty days for maximum tenderness and taste.