The effects of twin-foster calf rearing on calf weight at 200, 291 and 365 days postcalving, on calf weight produced per cow, and on reproductive performance of cows were evaluated using fall-born calves. Eleven Holstein × Angus or Holstein × Hereford 2- or 3-yr-old cows rearing 20 Holstein or Limousin crossbred calves were compared with cows of similar age and breeding rearing 13 single-suckled Limousin crossbred calves. Twin calves were significantly lighter than single calves, but calf production per cow at 200 days postcalving was increased 39% by twin fostering. At 291 and 365 days postcalving, production per cow from twin fostering was 50% and 55% greater than that from single-suckled cows whose calves were weaned at 291 days. Twin fostering did not depress reproductive performance of the cows. However, supplemental feed costs and labor required at fostering were considered to restrict applicability of this management practice. Weaning at 9 mo as opposed to 200 days of age increased calf production per single-suckled cow without a substantial increase in costs. Key words: Cow-calf, twin foster, single-suckled, fall calving