We bought/rescued a trio of goats from a man that thought it was OK for goats and pigs to live in the same 10x15 dog lot. They too were VERY skinny and both nannies were pregnant. Our vet came out and told us to feed them not only the high fat grass hay freely but to feed them sweetfeed and instant oats or grits mixed with a little goat milk(of all things). He said that we could feed them as much as they wanted. The more high fat foods they had the more weight they would gain and have the neccessary fat stores to survive the birth and to make milk for the kids. But of course everyone has there own opinions and things that worked for them.