This is the best place to learn.
Sizzle has curly reg feathers.
Smooth has strait reg feathers.
Both have all other characteristics of Silkies. If you breed a smooth to a Sizzle you will get a mixture of Sizzle, Smooth, Frizzle and Silkie in the offspring.
Do not breed two sizzle or frizzle together or you will get a bird with very brittle feathers called a Frazzle.
Someone correct me if I'm wrong on that.
excellent job K Epp, just wanted to add a bit....
when breeding a frizzled sizzle to say a silkie or a smooth bird (that is not split to frizzle but is split to silkie).
you will approximately get......
25% silkie split to frizzle
25% frizzled silkie (some times called rough silkies)
25% frizzled sizzle
25% smooth sizzle split to frizzle
* if your breeding your sizzle to a bird that does not have silkie in their gene pool you will not get any silkie offspring, both parents have to carry the silkie gene.
Frizzle just refures to the bird having the up word curl to their feathers or not.
And frizzles are available in just about every breed of chicken out there.
sizzles how ever should ideally have every characteristic of a silkie but with out the shredding of the feathers.(making silkies an ideal choice to cross with a sizzle)
But both smooth and frizzled birds are called sizzles as long as they have both silkie and frizzled in there gene pool.
and then all the offspring that have silkie feathers are just called silkies. they can be frizzled silkies or just regular silkies.
i think the confusion comes when people present silkie mixes that don't have frizzle in their heritage.
So why is it important to know if your chicken is a smooth sizzle or a silkie mix, if they both presents with smooth feathers and similar type??
The main reason becomes apparent when breeding them... if you use a smooth bird split to frizzle with a frizzle bird, you get a big jump in your percentages about 75% frizzled to 25% smooth. so its worth wild to hold on to the smooth sizzles!!!! a secondary perk come when you want to beed for a frizzled sizzle birds.
when you use a silkie not only will it not be split to frizzle, but you also increase the chances of getting mostly silkie or frizzled silkie chickens and not as many sizzles.
at least thats what my understanding is on the subject, all ways happy to learn if any ones else got input on it.