It's all fine.
We are talking about production on this thread. If you want the best production and you are a small farmer, maybe selling to a farmers market, keep the fertility loss in mind when breeding. If you are a breeder working on SOP and other goals then you will want to use your best for longer.
It all depends on your goals. Information was given. Assumptions about what the mean is up to the reader.
My intent was not to be critical of your post, but to offer an alternative. To imply that a cock bird could not have good fertility after one year is not true. It just isn't. I would hate to think that everyone will start killing their good birds after one year, because they do not think they can no longer produce fertile eggs. You cannot get anywhere good like that.
There are people that visit these threads that would think you cannot use or should not use a male after one year.
My NH cock bird that I was referring to at three years still has 85-90% fertile eggs, and they hatch fine. Where does he fit into your statement?
It is true that after a few years some will start having trouble with a male. Some will not. They are not all the same. You pick these things out with experience. It is up to the breeder to decide at what point an individual birds is not worth moving on with.
It is also true that they will be most fertile as fully developed cockerels. They do lose fertility as they age. You just added the question that you wondered how many people's hatching issues were from using males after older than one year.
I do not know were the SOP comment comes from. I suppose that is a curve ball. Tis is not an SOP vs. Non SOP. Anyone that has paid any attention to what I write knows that I breed to the Standard, but my goal is to have productive Standard bred birds. I see the birds as livestock, and manage them accordingly. Regardless, the breeding concepts are the same. They have been the same since before our time.
This thread is titled "Breeding for Production", and to me an important production characteristic and breeding goal is longevity. It is not for some. I get that. I just am not interested in breeding birds that are useless or disposable after one year. There is millions of them around the world already. I cannot rationalize the appeal in that. What sense would that make?
So Ron, I did not mean any disrespect. I just disagreed, and explained why I did. These exchanges is where the information comes from and the point behind having these threads. We will not always agree.