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For Brahman or Santa Gertrudis crosses (tropical breeds), a medium to high roughage diet may be adequate. For animals raised on the range from weaning to 18 months, a daily live weight gain of 0.3 kg has been reported (Animal production and range research unit 1988) and this will probably decline as the animals mature.
The average dairy cow produces around 6.5 gallons of milk a day. A gallon of milk weights 8.6 pounds, so that's 55.9 pounds of milk each day. Holy cow! The record holding cow produced an astounding 52, 298 pounds (almost 7,000 gallons) of milk in one year.