If you were raising them commercially you would obviously need a lot more than three cockerels to support your family. Assuming you bought most of the food they ate, how much did it cost to raise those three to your butcher age? If you had been raising Cornish X you could have raised three...
Science has that answer, it's the genetics the hen gives the egg before it is fertilized. So the study should take that into account and look at what happens inside the hen to see if they can affect that. If you look at anything after that, well have you heard the phrase about locking the barn...
Notice the date on that article, 1997. Twenty-two years ago. Do you really think that if there were anything to it this would be standard practice in the commercial chicken industry by now? Some things just fail the common sense test.
Certain myths just won't go away. You really cannot...
are there enough hens to keep the roosters happy?
I don't think happy roosters should be the goal. I'm not sure happy hens should be the goal either. Maybe a peaceful flock?
I don't know what you are seeing right now or how old your birds are. If they are fully mature and peaceful life is...