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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.
The calf may gain 60 lbs during pre-calving, and the placenta is also growing. Cows need to gain 1 to 1.25 lbs per day, while heifers and young cows need to gain 2 to 2.5 lbs per day. Along with fetal and placental growth, cows are preparing for lactation.