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I do not feed the large sunflower seeds that they sell for people. I feed the black oil sunflower seeds (birdseed), which are much smaller, and even sometimes buy them mixed with millet (birdseed). Millet is only around 11% protein and the black oil sun seeds are around 16% protein, to give you some info.
I don't do anything special to the black oil sunflower seeds (BOSS) before I serve them. They swallow them whole. Even bantams. The grit in their gizzards is their "teeth." The grit will be passed when it gets round and not sharp enough to grind the grains anymore, I have read.
Pumpkin seeds I think were 31% protein if memory serves. I used to buy the ones meant for squirrels. But they don't go for them except in very small quantities, and they wouldn't be good for bantams. I used to go through and try to crack the pumpkin seeds in half with my hands. No more of that for me, lol!
Since you do have some bantams I would encourage you to mix in cracked corn instead of whole, as the little bantams have a hard time with larger seeds and can even choke on things. For chicks less than 2 months old I like to feed organic starter crumbles since they have a hard time with the larger grains/seeds. Since you have a serama mix I highly recommend offering choices that are small enough for her and Loosy- in other words, calculate your protein without the larger seeds like pumpkin seeds and see if you still have a good mix.
http://www.ca.uky.edu/smallflocks/Feed_ingredients/Grains.html
http://www.gov.mb.ca/agriculture/livestock/poultry/bba01s20.html
I would encourage you to read especially the second link regarding barley and oats.
(You might consider adding some wheat for balance.) Then you would end up with the same sort of mix as the commercial mixes...wheat, corn, roasted soybean meal (MUST be roasted). But you would also have all this other variety, which I think is great.
Enjoy your birds!