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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.
As a general guide, a mature cow will consume 10kg dry matter (DM) grass in the first week after calving. This should rise by 1kg per week for eight weeks into lactation, when daily feed intake reaches a plateau (Figure 1). First calving heifers will eat 1.5-2kg less grass DM than mature cows, reducing average daily grass demand by around 0.5kg per cow during spring. DM Intake of Mature Cow For herds that reach peak production of around 2.0kg milk solids per day (27kg milk), the daily deficit in energy before maximum grass intake is achieved equates to 3-4kg high energy concentrate per day where high quality grass is available.