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The dairy cow normally has her first calf at the age of two when she will be producing around 35 litres of milk a day. In subsequent lactations this figure rises even higher. She will continue to be milked for 10 months - but will be made pregnant again in the third month. Professor John Webster, Department of Animal Husbandry, Bristol University says: “The dairy cow is a supreme example of an overworked mother. She is the hardest working of all our farm animals and it can be scientifically calculated. It i
