I just put 14 eggs worth of F2 & F1 generations into the incubator. Hatch date 2/10/16.
The mixes are:
9.5 pound Redmen over 8 pound Lavenia
1/2 Dark Cornish 1/2 Cornish Roaster Redmen over the same mixed pullet "Lavenia". Same father different hens. Should net 25% Dark Cornish type, 50% 1/2 & 1/2 type, 25% Cornish Roaster type. Growth rate all over the map from fast to semi fast to slow.
Next cross is 11 pound Bob over 10 pound Betty:
1/2 Dark Cornish 1/2 Cornish Roaster "Bob" over Cornish Roaster hen "Betty". Not directly Related. Hens were from the same place( Murray McMurray). Should be 1/4 Dark Cornish 3/4 Cornish Roaster. Semi fast growing white. Faster than my 1/2 & 1/2 crosses.
Next cross is 11 pound Bob over 7.5 pound Marion:
1/2 Dark Cornish 1/2 Cornish Roaster "Bob" over Pure Dark Cornish hen"Marion". Should net 3/4 Dark Cornish 1/4 Cornish Roaster. Semi Slow Grow type. Most likely will be red/black/white or red/black
And my Pure dark Cornish 12 pound BamBam over 7.5 pound Guinevere:
100% LF Dark Cornish. Slow growth
Fingers crossed. I rotate my eggs into the incubator every six days/candle every six days. After 18 days they are moved out to the still incubator to hatch. Works for me. I am looking forward to this year's hatch!
I'm very impressed with your project Ipatelski. I've thought about doing the same thing to create a stabile Cornish type chicken with a goal of a 4 pound cleaned carcass at 12 weeks. I think a true breeding, medium growth Cornish would be the answer for many Homesteaders meat bird issues. I've had chickens for years but am just getting into the breeding, bui with other livestock we stabilize new composite breeds at 3/8. I'm thinking in this case it could be 3/8 Commercial Cornish and 5/8 Dark Cornish with selection for consistent medium growth rate. Of course these are just my pipe dreams of how I would do it but please keep posting. My energy has to go into my Dorking project for the immediate future, but I'm very interested in your results.
By the way, from what I've read the commercial Cornish crosses have significantly higher resistance to Mareks Disease because of Cornel's work in the mid 20th century. That could be a real asset to your strain.
One question: are you aware of the importance of selecting for earlier feathering? If not it should help you determine growth rate of individual birds within the first couple of weeks rather than waiting months for them to grow out.