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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.
Daily cow requirements. Dry cow liveweight MJ ME/kg Lwt change (Diet ME required or saved) Lwt gain 72; Lwt loss -30; Example: Daily requirements of a 450 kg JXF cow, 12 weeks before calving and gaining 0.5 kg/day Lwt (1/2 BCS in 30 days) at 11.0 MJ ME/kg DM. Maintenance = 54; Pregnancy = 12; Lwt gain (0.50 kg Lwt x 72 MJ) = 36; Total MJ ME = 102