Okay.. if im understanding you correctly.. a good dual purpose breed will take longer to produce and not as many.. but will produce over a longer period of years? And are healthier in general? This sounds perfectly good to me. Can you name a few for me to choose from please. Thanks
There are commercial lines of hybrids that produce exceptionally sell their first year. Second year production is still ok, but not enough to justify the space and feed compared to the first year pullets, so off they go to the soup factory. Some people have rescued these "spent hens" and found them to be decent layers for several more years. I would not be surprised if they out-laid the more "dual purpose" breeds for several more years, they are bred to be laying machines. They can have higher incidents of reproductive problems, no one tracks that commercially and the farmers don't care.
I have heard the theory that all hens lay the same number of eggs over their lifetime, some just take longer, but that does not stand up to reality. I have some ornamental breeds (Ayam cemani and genetic hackle, for example) that would have to live 20+ years of laying to catch up to a Legbar or Welbar, and if you kept the Legbar that long, she would probably still be outlaying the pretty girl (not that legbars aren't pretty, they are very pretty little things).
The last little "secret" that is not mentioned when extolling the value of the "dual-purpose" breeds, is that very few of them as sexable as chicks, except with vent sexing at the hatchery, which is not 100% accurate. If you really don't want to deal with a rooster, stick to breeds and hybrids that you can sex, even with no experience.
This is an example of a pair of chicks from an autosexing breed. These are Welbars, an autosexing version of the popular Welsummer breed. You can figure out the sex yourself if I tell you that females look like chipmunks and males look like caramel candies.
Welbars are an outstanding laying breed. I do not replace my breeders every year, like many hatcheries, they keep laying year after year. Their eggs start out very dark brown and fade to lighter brown as the season progresses. I imagine it as they are running out of ink, just producing eggs faster than the color producing glands can keep up. I love the very dark eggs in the early spring, but I also smile when I gather 20 lighter brown eggs in August from a pen of about 2 dozen hens that are several years old.
In some ways, Legbars are even better with their bright blue eggs! And when I cross the 2? I get autosexing Olive Eggers, those are actually my most popular chick most years. The olive egger chicks look exactly like these Welbar chicks - I have to keep them separate in the hatcher and brooder, but they develop a jaunty little comb-over sort of crest as they grow up. Very distinctive looking and amazing layers just like their parents.
I have spent years developing these lines of laying breeds and have a large local following of chicken keepers. Most of my sales are referrals or returning customers now, and I am trying to get other breeders setup with these genetics to make chicks available to a larger geographic area.
I can tell you that a mixed group of these breeds will all get along and mix as if they were siblings. I see it over and over again. They do have some similarities in size and color patterns, but they are distinct breeds that live together in harmony.