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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.
Diets are carefully balanced to meet all of the cowâs nutrient requirements for pregnancy, milk production and growth (if she has not yet reached her mature weight). A lactating cow will consume between 18 and 25 kg of dietary dry matter each day, depending on how much milk she is currently producing. Cows have access to feed and water at all times, except during milking (2 or 3 times per day). On farms with voluntary milking systems, the cows may receive a small amount of grain each time they enter the milking stall (4-8 times per day).