We have raised Boer goats for the last few years. I have never heard of feeding goats baking soda and would be concerned that it might cause them to be terribly bloated. The main thing to do is to feed them grain, hay, and let them graze grass too. Sometimes if they eat the grass down to the dirt level, they can get a bacteria that will kill them quickly. Just watch that they don't eat the grass down this low and move them from time to time to prevent it.