It can take a long time for a bird to accept a new food, but if you keep offering him a little bit he might start eating it after a while. Try offering it in different ways if you can think of any - sometimes a bird will accept a food if he likes the way it's offered.

I just dont like to leave breeding food at open air without being eaten :\ it's better to eat it when it's more fresh. Don't like to waste food >.< But i'll try to make him eat it then.

Just offer him a little bit so there won't be a lot of waste if he doesn't eat it. Put something he likes with it so he has to at least touch the breeding food to get to the stuff he really wants.