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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 cow in the U.S. produces about 21,000 lbs. of milk per year, thatâs nearly 2,500 gallons a year! On a daily basis, most cows average about 70 lbs. of milk per day, or about 8 gallons per day.8 gallons is about 128 glasses of milk per day.Interestingly, a herd of 800 cows can produce a large tanker truckload of milk each day. Over a year, that would be about 20 million lbs. of milk or 2.3 million gallons of milk.**Productivity of the average cow in select countries. gallons is about 128 glasses of milk per day. Interestingly, a herd of 800 cows can produce a large tanker truckload of milk each day. Over a year, that would be about 20 million lbs. of milk or 2.3 million gallons of milk. **Productivity of the average cow in select countries.