Sorry, just seen this. I feed after the bitch has whelped then continue giving her it for 'breakfast' for about 2-3 weeks after. Mine ( and most of the bitches I have heard about) love it and I just feel that it gives them that boost each morning after feeding pups during the night.
Sorry, didn't have Internet access today. I can only echo what Alison says. It really helped me with last litter as it was all mum would at so I'm eternally grateful to chamdogs for it :-)