Can a cow eat bread carrots apples?

As a little treat, sure, but not as a main staple of their diet. Cattle need to be on grass, and fed hay as their staple diet. Apples can cause a choking hazard of a bovine swallows them whole, and so can carrots, since cows typically don't chew before swallowing. If you cut the carrots and Apples up in little pieces that your bovine can swallow without choking, then she'll be better off.