I have a blue bibbed girl, a black girl and a silver girl. i got rid of my black and my blue drakes and kept my silver. all im getting is blue and blue bibbed out of them, why am i not getting any black or silver? what color drake should i be using?
When you say "Silver" do you mean Silver/Splash (genetically Extended Black + two Blue dilutions, which basically makes a very light Blue), or Silver, as in the UK verison of Silver (which I *believe* is genetically a light-phase Apricot Dusky - but don't quote me on that!
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Assuming that you mean Silver/Splash and we're talking about basic Blue/Black/Splash genetics...
Your drake has 2 copies of the Blue dilution. He passes 1 copy of that gene to EVERY one of his offspring. So, it's impossible for you to get any Black ducklings from him. Your Silver girl also has two copies of the gene, and passes one of hers to each and every one of her offspring. Your Blue Bibbed girl has 1 copy of the Blue gene, so she is passing a copy of it to approximately 50% of her offspring. Your Black girl, obviously, is just Extended Black, she's not passing Blue to any of her ducklings... however, your Silver drake still IS.
Silver/Splash x Silver/Splash = 100% Silver/Splash
Silver/Splash x Blue = 50% Blue, 50% Silver/Splash
Silver/Splash x Black = 100% Blue
Basically - you can't get any Black ducklings from your drake, but there's no reason you shouldn't be getting any more Silver/Splash from your Silver and Blue Bibbed girls. Perhaps your Silver girl isn't laying, or none of her eggs have successfully hatched yet. Eventually, you will see some Silver ducklings from your group!
If you want more Black ducklings, you need to use a Blue or Black drake.
Blue x Blue = 50% Blue, 25% Black, 25% Silver/Splash
Blue x Black - 50% Blue, 50% Black
Black x Black = 100% Black
Also, remember that the percentages are approximate and work better with large numbers - if you took a Silver drake and a Blue Duck and hatched 1000 ducklings, you'd get an almost perfect ratio of 50% Blues and 50% Silvers, If you'r hatching small batches at home, you might hatch 7 Blues and only 1 Silver in one hatch, and then get nothing but Silvers your next hatch!