I took a 2 week old Red Angus cross heifer from my Dad's farm and raised her on a bottle. That was not quite 3 years ago, she was born to a 20+ yr old cow that couldn't feed her, she was a scrawny little thing when I got her.
I had a big advantage though (IMO), I was milking a Jersey at the time, so the little heifer got Jersey milk instead of replacer, and she loved it.
I put her straight into a 7' x 9' stall. I had to pin her neck between my legs to get the bottle into her mouth, a bottle was offered every 12 hours, and it was 36 hours before she would suck on the bottle. By the 3rd day, when she heard the barn door open, she was hanging over the stall door looking for her bottle.
As soon as she was eagerly taking the bottle, she was offered good quality calf starter. She was weaned at 11 weeks of age, and was fed a small amount of grain daily until she moved to Dad's farm when she was 3 mos pregnant (she was fall born and bred at 21 mos for a spring calf). I took great care not to allow her to put on fat before she was bred.
Dad gave her a handful of range cubes during her last month of pregnancy. She had her first calf Feb 27th and has turned out to be a really good heifer, she's on grass, milking well, calf is growing real well, and she doesn't appear to have lost any weight.