I'm attempting to develop my own line of Plymouth White Rocks this year using an old line passed down through many generations and developed by each consecutive breeder bred over another such line and also over a hatchery sourced line. One heirloom line is called the Blosl line, named for the last breeder who developed it and the other heirloom line is called the XW or JWhip line, named for the fellow currently developing it. My male is out of the Blosl line and the females out of the XW and the other female out of hatchery genes.
I like the hatchery genetics I have used for this, as they have been extremely good layers, heavy on meat, hardy to the max, with good foraging and survival skills, good winter laying, excellent feathering and good mothering. I'm not impressed with the feathering or laying of the XW female at all, nor her hardiness, though she's an excellent forager, wily out on range and goes broody enough to be of use. I'll not be using her offspring for breeding this year.
So far, the offspring of the hatchery cross win the prize and get to breed this year. I'll be breeding these 50% females back to their sire to produce 75% heirloom/25% hatchery birds in hopes of broadening their backs but keeping the good laying genes. If I get a 75% male that resembles his sire in size and conformation but has the feathering of the hatchery genes, he will be my keeper and the start of my own new line.
I can then breed him back to his dam and his aunt and later on even breed him to his daughters, but cannot breed him to his sisters.
Here is a pic of the Blosl male, the heirloom side of the cross...he's a bit bigger now than he was in these pics.
![](http://cdn.backyardchickens.com/b/bf/900x900px-LL-bf5d9e0b_100_1864.jpeg)
And here's a few pics of the hens I bred him over.....the first pic has the hatchery hen I bred him to in the back left of this pic....
![](http://cdn.backyardchickens.com/f/f6/900x900px-LL-f692453a_WRsintheclover.jpeg)
And here's a pic of the heirloom hen, the XW....
![](http://cdn.backyardchickens.com/d/d3/900x900px-LL-d3c9de12_100_2216.jpeg)
And I bred him over this hatchery stock Black Aussie just for funzies and got a young pullet I really love the looks of and will be breeding her back to her sire just to see what pops out. I'll use her and her offspring for my utility flock while I develop this line of Whites.
![](http://cdn.backyardchickens.com/e/eb/900x900px-LL-ebb9a1f8_100_2024.jpeg)
And her daughter out of this White Rock sire....a barred female...here at 3 mo. of age:
![](http://cdn.backyardchickens.com/4/4b/900x900px-LL-4b2b5674_100_2600.jpeg)
I'll update as the breeders I've chosen fill out and mature into layers, with pics of each. Will be incubating in an Eco20 and also in a natural nest with a heating pad this spring to double down on hatching. If I get a broody long about then, I'll load her up as well.