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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.
It totally depends on the breeds of cows used for milking. Dairy cow milk yield has increased from an average of 3,750 litres per cow per year (12 litres/21 pints per day) in the 1970s to 7,445 litres (24.5 litres/42 pints per day). One of the highest yielding cow breed is Dutch Holstein Friesian cows.