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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.
Per head daily of protein supplement should be fed along with a small amount of grain Dairy Cattle: Lactating cows:2.lbs of dry roughage daily per 100lbs of live weight. 2 to 3 lbs of concentrates per head Dairy Heifers:2 to 3 lbs of concentrates per head on good roughage. 4 to 5 lbs on poor roughage.