CChris, Quality heritage breeds are a lot different than regular hatchery stock. I raise S.O.P. (Standard Of Perfection) Black Australorps. I can't say that they develop at a slower rate exactly, but their development is entirely different than that of hatchery stock. My males have to reach 9 lbs. It's not just the weight. They have to develop a good frame, then the musculature, and fill out properly too. There is a significant difference between a 6 month old cockerel, and a year old rooster. Everyone talks about their hatchery Black Australorps laying in 3 months, or so. Mine don't begin laying until they are at least 6 months old.
While that seems like a long time to wait, my hens are not spent in 2 years. I get 3 - 4 good years of production. I have a 6 year old that has slowed down, but she laid good for the first 2 months this spring. She's currently slowed down to a couple times a week. At 5 years old, she and her sister laid daily for the first 3 months in spring, then about every other day for a few months, then a couple times a week. Not bad for old hens. My roosters are active, and fertile longer than hatchery stock too.
While that seems like a long time to wait, my hens are not spent in 2 years. I get 3 - 4 good years of production. I have a 6 year old that has slowed down, but she laid good for the first 2 months this spring. She's currently slowed down to a couple times a week. At 5 years old, she and her sister laid daily for the first 3 months in spring, then about every other day for a few months, then a couple times a week. Not bad for old hens. My roosters are active, and fertile longer than hatchery stock too.
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