How to Tell the Difference Between Bulls, Cows, Steers and Heifers - SAU
All About Cows - Super Simple
Beef could get more expensive because bulls are literally freezing their nuts off | Grist
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How to tell the difference between bulls, cows, steers and heifers - Quora
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The Cow's Ball - tribute to the alpine dairy farming | Domestic Animal Diversity Information System (DAD-IS) | Food and Agriculture Organization of the United Nations
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Cattle 101: History, Breeds, Fun Facts, Terms - Beef2Live | Eat Beef * Live Better
Calf Ball - Stress Relief for Calves | FutureCow.com