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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.
Average cow weight x hay DMI (% of cow weight, as a decimal) = DMI/d1300 x .025 = 32.5 lb of hay DMI/day Step 2 â Adjust Daily Hay Disappearance Per Cow for Waste In addition to what cows consume, there will be some waste associated with feeding hay and this must be accounted for when calculating winter feed needs.