Good morning yall (just catching up before church so I don't have too much time)....but
On my Columbians (Fred, if you know of a Colonial Rock strain please lemme know, LOL, you must need a coffee!!),
Fertility - NO ISSUES. Over the past 3 hatching seasons I can say that I've tossed 1% or less due to fertility. Keep in mind that I've been using almost exclusively an older cockerel or a 1 yr old cock bird, so I have had "youth" on my side. This year was the first year that I used more than 1 male and I still had no issues
Hatching rate - thus far has always been good. First 2 seasons I was worried about getting large numbers on the ground so I did not keep very good records, but this season I hatched 94% of every egg I put into the incubator and that made it to day 18. Very rarely did an egg not hatch. Broody hatches this year have been 100%. Have had 4 girls sit a total of 6 times and they hatched every single egg each time (unfortunately these hatches were later than I like)
Feather rate - since I have also had GS and Stukel rocks, I have a point of comparison here and I'd say mine are a bit faster feathering than the barreds, but not quite as fast as the solid colored birds. My males seem to feather more slowly than the females, especially along the hackle/back area.
Maturity - WOW, not this is a "can o' worms"....gonna address this 2 ways, sexual and size. On my Females, they seem to reach POL around 32 weeks (+/- 7 months), a lot slower than hatchery birds. As far as size, I can tell my keepers from my culls around the time they lay their first egg, but they do continue to fill out until they are around 15 months old. On my Males, the seem to begin feeling their oats around 4-5 months and I have to keep the young males penned away from the young females so that the females are not constantly harassed. In similar fashion to my females, I can normally pick the "cull" males by around 7 months (those that are lagging behind, poor color, high tails, etc). However it is very hard to select from amongst my potential keepers until they are over a year old and they seem to continue filling out until they reach about 18 months.
Vigor - keeping in mind that my original trio came from Canada to "the deep south", and my first year I experienced some loss of chicks/young birds due to the heat and likely due to the strain adjusting to such a climate change. Plus, it was one of the hottest summers ever on record here. The second year, I lost a couple, but very few. This year, NO issues at all. Now, one thing that I have found is that the early I hatch chicks, the fewer issues I have come summer AND the birds are also larger. My philosophy is that the cold causes them to eat like little pigs and they grow quickly. By the time the worst of the summer heat arrives, they are 6+ months old and better prepared for it. Its very hard to put weight on a bird in the summer time. Last season I hatch at the end of December. This next year I am going to try hatching around Thanksgiving, just to see if there is any noticeable differences. A friend in SC recommended that I hatch early than Dec, so I'm gonna give it a try
Off to church....will be back after 12