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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.
Table 1 gives the maximum total DMI (from roughage and grain mixture) that milking cows can eat in mid-to-late lactation. The table lists DMI as a % of body weight and in kg per day. A cow weighing 550 kg giving 30 kg milk can eat 3.7% of her body weight in DM daily or about 20.4 kg.