Year: 2008
Type: other
Abstract: Data from Cornell University and the University of Illinois in the USA suggested that\naverage daily liveweight gains of 900 to 1000 g/calf/day could be achieved from birth to\nweaning provided the calf milk replacer (CMR) is formulated to meet the calf’s amino acid\nrequirements for such a rate of gain. Their findings suggested a daily milk replacer DM\nallowance of 1250 to 1500 g/d with a crude protein content of 26 to 30%. A series of studies\nwere undertaken, at ARINI with home born dairy calves and at Grange Beef Research Centre\nwith purchased dairy calves, to determine the effect of increasing the daily milk replacer DM\nallowance and or increasing the crude protein content of the CMR on calf performance. The\nmain outcomes of these studies were\n There was no growth or intake response in any of the studies to increasing the crude\nprotein content of the CMP from 23% to 28%.\n Calf growth rates responded to increasing the dailymilk replacer allowance from 600\nto 1200 g/day for both home bred and purchased calves. However, the effect was not\nsignificant post-weaning in any of the studies.\n In all of the studies (for both home reared and purchased calves) feeding a high level\nof CMRdecreased concentrate DM intake. However, the calves concentrate intakes\nwere similar post-weaning.\n The home bred calves with free access to the milk replacer feeders failed to consume\ntheir 1200 g/day allowance. Calves offered 600 or 1200 g of CMR/day had average\nconsumption of 554 and 944 g/d, respectively, in the milk feeding period.\n Feeding a high (1200 g/d) compared to a low level (600 g/d) CMRdiet for the first 56\ndays had no significant effect on carcass weight or carcass characteristics when\npurchased male calves were slaughtered off an ad libitum concentrate diet after 388\ndays. The final carcass weights were 231 and 240 kg for the respective 600 and 1200\ng/d CMR.\n Reducing the fat content of the CMRfrom 18% to 12% did not have any effect on\nconcentrate intake or liveweight gain.
Language: English
Subfield: Animal Science and Zoology
Domain: Life Sciences
SDG: Zero hunger
Open Access status: green
OpenAlex ID: W2179128132