Are you meaning in the mare's feed? The colt, oddly enough, isn't even beginning to sniff Momma's feed. Every other baby I've had was at least showing interest, but both this mare's colts had to be completely weaned before even remotely wanting to try feed.
Yes in the mates feed.. It's pretty hot so you have to be limited on how much you give them but it sure will make a difference in one growing off