Milk goats and beef calf

(New York)

I have question about raising beef cattle on goats' milk. I plan on getting dairy goats and a calf to house over the winter (will be indoors almost all winter as we live in the northeast). I would like to keep feed costs down by feeding the calf goats milk well past the age I see for weaning (10-12 weeks). Because goats are herd animals I will be getting 2 and I can't see how I would ever use that much milk. I see the extra milk as calf food. Is there a problem with this idea?

[MEG: While real cow's milk would have to be the best option, goats milk is equally nutritious plus easy to digest, and would be far superior to a commercial powdered milk substitute.[