Hello, all - I have been breeding SPR for a good many years and have found them most challenging to breed. They are most definitely not for the faint of heart, or for those wishing to "make their mark" on the poultry world. They have moved so far from the SOP it will take many years to get them back.
I believe they fell out of favor with breeders due to the difficulty of the genetics. It's much, much easier to breed a solid colored bird, and the solids have been worked on consistently and by some pretty knowledgeable breeders for a good long time.
I do have a few comments, all my personal opinion, take them with a grain of salt if you will. I cannot speak to the "red" issue, as I have not seen that in my flock. My flock originated from a line that does not include Horstman or Murphy blood, so that could possibly be the "red" issue. The SMUTTY issue, however, is present in all the lines that I have personally seen (and I think I've seen them all). In my opinion it comes from the lack of silver genetic. Even though these birds are CALLED "silver," most do not carry the silver color gene. When they do, you will not see that smuttiness, and that silver genetic will move us far. Problem is, I believe smutty is recessive, genetically...meaning, you can have a bird that looks lovely, appearing to have a pure white base, and nice, crisp penciling. Use her, and her offspring may end up smutty. Why? The male can be a carrier but not express it. Thus, you're breeding two carriers, resulting in offspring having it.
That said, we should ALL go back to the old adage, "Build the barn first...then paint it." It's far more important to have good Plymouth Rock conformation that perfect color. I know, I know...we ALL want that pretty penciling in our hens. But, I think many breeders over the years (again, just my opinion) have gotten away from conformation with this breed because the pattern is so beautiful, and have based their breeding decisions more on pattern than conformation.
There are some things that you should ALWAYS see in a PR, and I would never breed a bird forward without them. To me, the most important is the topline - when looking at the bird directly from the side, from the base of neck back, the back should be inclined upward. This bird should have good balance, front to back. That is, again looking from the side, at the point where the legs attach to the body, the bird should not be front heavy (a common fault). The body, when viewed from the top, should appear in the shape of a rectangle, not round, like a basketball. And from the back, a good hen will have the tent shape to her tail, wider at the base and forming a tent shape.
These things are super basic, and the building blocks of a good bird.
Some of the things I see commonly are short station, much too fluffy, small heads, dusky yellow legs rather than bright yellow and, of course, overall size.
Size is a tough one. We're competing with some birds that are being bred to almost double the size they should be....it's - frankly - ridiculous. You don't ever want to be caged next to the Whites at a show! Most of our poor SPR look like bantams in comparison, sadly.
Egghead - what a lovely female! I am impressed. Keep up the good work. Focus on the overall size for your next go round, including station. Watch heads...we want large heads, not small ones. And the fluff issue...visualize a Cornish - that's clearly much too tight feathered for a PR, but we need them to have tighter feathering than most do.
Storybrook - and all - watch those cushions! It's a major flaw in our SPR and I would not breed forward a female with a cushion unless she had an awful lot of other reasons to do so. The female in post 26 has a pretty good cushion. To work on this, breed to a a cock with a LONG back - nice and wide body. The back length and width will really push your birds forward.
One last word on heads. Look at the distance from the top of the eye to the top of the head, then compare that to the bottom of the eye to the bottom of the skull. The first measurement should be longer than the second. You can with a day-old chick whether they'll have a nice head or not. So happy to see folks working this most awesome variety of Plymouth Rock!!