News Main Animals Archaeology Dinosaurs Earth History Human Animal Space Tech   Getty Images |   Call Me Bessie Compared to their nameless peers, heifers with individual identities produce an average of 258 more liters of milk over a 10-month milking season, or about an extra liter a day, a new study has found. An average cow produces about 7,500 liters of milk each year. | Discovery News Video   « back to article

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