I am seeing a range in feathering, but I have quite a few that feathered out faster than the F4s. They are feathering just as fast, or faster than the Dorkings hatched at the same time.
In the first hatch, at 4 weeks of age, 6 were completely feathered, 8 were mostly feathered and 2 were slow to feather. This seems to be the norm in each hatch.
Here's a pullet from the first hatch at 8 weeks:
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I am not happy about the slow feathering. That is not what a Delaware should be, they are supposed to be a fast maturing bird. So...is there any way to improve on the feathering? I am thinking not, in my case, if all of the offspring are slow feathering...I don't have any that are faster to breed from. Hmmmm....I'm just wondering to myself if I want to continue on with these. I already have the slooowwww feathering heritage Barred Rocks...
OK, another question. I bred one of my Delaware pullets, the one that was brassy on her back, to my Rhode Island Red for red sexlinks. The sexlinked pullets are popular around here since people in the city limits can't have male fowl. I decided to hold back a few of the male sexlinks for meat. Now I am seeing they are slow feathering. I don't have any of the pullets to compare since they were all sold. Would they be fast feathering, linked back to the father, a Rhode Island Red? I'm not sure how that all works. Because if the pullets are slow feathering as well, these Delawares are not what I want to use for sexlinks. The average backyard chicken keeper wanting birds just for eggs does not want to wait forever for their chicks to feather out, IMO.