Don't have males, so no reply for those ones.
I make sure my girls are on the slim side when going to be mated (easy if they are still milked, a bit more difficult with goatlings), and mine get a mineral drench (adam henson) a few weeks before. Maintain the slim condition until 8 weeks before kidding, especially with goatlings and dry goats (only very little concentrateand mainly hay).
I also sponge all my females at dfiferent times though, so that I can plan matings and kiddings a bit more accurately.