Whoops, I screwed up some info in that post so lemme try and redeem myself.
I screwed up the chicken chromosomes… The Rooster has ZZ and the hen has ZW. When I was typing it up, I was like… “hey is this right? This is right, right?” I should have just checked…
Anyway, it’s only relevant to sex link chicken breed hybrids and has practically nothing to do with a typical breed. I was just trying to demonstrate that sex links (which can be sexed reliably at day one) don’t solve anything about the surplus male chicks, and only results in one generation of chicks which can be reliably sexed.
Here’s a quick punnett square, I guess. The barred gene is located on the Z chromosome.
So a barred hen has ZW in this example and a solid non barred rooster has zz, just for legibility. So the males resulting from the breeding of a solid rooster to a barred hen would inherit one barred Z from the hen and one solid z from the rooster.
| Z | W | |
|---|---|---|
| z | Zz | zW |
| z | Zz | zW |
However, the resulting chicks cannot be used to produce more sex linked chickens. The female chicks have no barred Z, and the males have only one solid z. Barred to solid doesn’t work as it results in all chicks being barred.
| z | W | |
|---|---|---|
| Z | Zz | ZW |
| Z | Zz | ZW |
But yeah… I mean, if it doesn’t matter if you have female or male chicks, because you have purposes for both, then you don’t need to sex them so quick, so you can just have a normal, sustainable breeding population.
Meat birds like cornish cross have this same problem. You can’t reliably have a cornish cross through breeding cornish crosses. I mean, there’s more problems with cornish crosses than that, as typically they’re not able to reach breeding age, anyway. When they live much longer than their intended slaughter date, they usually have heart attacks or break their legs. It’s also possible to overfeed them to weights that will crush their organs.
I got my rooster for free, and didn’t end up eating him. I’m allowed to keep roosters and he does a good job looking after his flock. And, I want fertile eggs. So, not every free rooster finds himself in a cookpot.
In general, I really enjoy having chickens, and they’re fun to have around. They do an excellent job keeping my property free of ticks, and they also eat maggots out of cow patties, which keeps the flies down.
Even more so today than a century ago. Feed formulations from 100 years ago list a prize leghorn (the most prolific egg layers, and what most egg laying factory farms keep) producing about 100 eggs a year. Contrast that with today’s typical leghorns which produce 280 eggs a year. That’s what an average leghorn today can lay. Most of that can be attributed to how good we’ve gotten at feeding them over the years.
However, a chicken will cease laying eggs before she begins to struggle with weak bones. Typically it’s the eggshell which becomes weakened first. Or she may lay a shell-less egg. Or cease laying entirely.
This year there has been a shameful amount of people claiming that their chickens have stopped laying eggs because the feed producer is allegedly putting something in the subpar cheap feed to cease them laying. These people claim that once they put the chickens on a homemade feed-- which is often even worse than the already subpar commercial feed-- the chickens begin laying again. It’s a total lack of knowledge about chicken biology and embarrassing to watch. Chickens slow or stop production of eggs naturally during the winter or during molt. They may also stop when it becomes too hot. I’m not exaggerating when I say that each individual claiming this was feeding subpar, cheap, 16% protein layer feed with no additional supplemental calcium.
Anyway I’m getting too far in the weeds. I don’t particularly take issue with veganism, so I’m not trying to debate. Just offering some info.