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In the Triple-B Association each cow's milk is tested every two months. The results are kept in a record book. In this way the farmer can accurately judge the producing value of each cow, weed out the poorest ones and breed the best. Black Hawk County, Iowa. Sourced from the Library of Congress.

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In the Triple-B Association each cow's milk is tested every two months. The results are kept in a record book. In this way the farmer can accurately judge the producing value of each cow, weed out the poorest ones and breed the best. Black Hawk County, Iowa. Sourced from the Library of Congress.

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