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An intake of spray-dried whole-ll)ilk powder equivalent to 2% of body weight was maintained in calves during the first 12 weeks of life when the powder was supplemented with iron, copper, and magnesium.Intakes relative to body weight declined after the age of 12 weeks when fortification with iron and copper ceased. Gradual increases in the dry-matter content of milk to compensate for the decline in abomasal capacity relative to body weight did not enhance intake between the age of 12 and 16 weeks.Supplementation of spray-dried whole-milk powder with iron and copper at levels of 46.7 and 5.1 mg/kg respectively maintained blood haemoglobin concentrations. Fortification of the powder with 0.25 g of magnesium per kg did not prevent, but appeared to delay, the onset of progressive hypomagnesaemia.An increase in the apparent digestibility of fat and a decrease in the digestibility of lactose and ash were noted with advancing age. Reconstitution rate did not affect the digestibility of milk nutrients up to the age of 16 weeks.

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ABSTRACfThe carcass composition of 38 Friesian bull calves fed exclusively on reconstituted spray-dried whole-milk powder supplemented with iron, copper, and magnesium, and averaging 90 kg in hot carcass weight, was studied. The calves came from five nutritional treatments. There were no differences between treatments in carcass weight or composition. The carcasses averaged 61.3% salable meat, 26.4% bone, 11.6% fat trim and waste, and 0.7% kidneys.

Forty Friesian bull calves were reared by the "restricted whole milk and early weaning concentrate mixture" method. The daily allowance of milk was offered in two equal feeds at 7.00 a.m. and 4 p.m. to 20 animals in one group and in a single feed at 7.00 a.m. to the 20 remaining calves in the other group. Both groups grew at similar rates and consumed the same amount of concentrate during the pre-and post-weaning periods.