Where are you located? It really depends on what is around you. We have Boer goats, not dairy, but there are a lot of good options out there.
If you are near Ohio, Kalmbach feed makes a good 16% all natural Sweet feed. We have used this in late gestation for our does especially since they tend to have multiple kids and helps keep them eating - had one that had been sick and sweet feed is all she would eat until I was able to wean her back to the pelleted feed we use.
They also make a feed called Goat Granola that I've been curious to check out for the future.