It should be said, that commercial enterprises have turned Leghorns into laying machines, and production Rhode Island Reds are quite commonly used in "egg factories," so even non-sex-linked male chicks can suffer the same horrendous fates. The discovery of a means to distinguish between the sexes revolutionized the industry. As cross-breeds, they are mongrels and cannot be entered in sanctioned poultry shows. I've read, for example, of at least three different parentage paths for Red Stars, including one claim that they are identical to Hubbard Golden Comets. Under the new model, it was not cost effective to raise males of layer breeds. They accepted that hens would lay enough eggs for home consumption and enough extra, perhaps, to supply neighbors. The main reason they are not included on the chart is because they are not actually chicken breeds. The shells of their large to extra-large eggs are a rich brown. The male chicks could be disposed of quickly, since there were no longer of use commercially as meat birds, since they would take twice as much time or longer as Cornish-Rock crosses to develop full size and they never would develop as much white meat.
The discovery of a means to distinguish between the sexes revolutionized the industry. I have read from several independent reliable sources that Hubbard Golden Comets are produced by crossing a White Plymouth Rock hen with a New Hampshire cock. Roosters grow to 8 or 9 pounds. A related objection involving the use of sex-links as industrial chickens is that these specialized strains have limited the genetic diversity of chickens and endangered heritage purebred chicken breeds. I've read that all red and black sex-links are gentle birds, but I've also read that some strains can be quite aggressive and bossy. None of ours have gone broody. The male chicks could be disposed of quickly, since there were no longer of use commercially as meat birds, since they would take twice as much time or longer as Cornish-Rock crosses to develop full size and they never would develop as much white meat. Rhode Island Reds and New Hampshires are commonly selected for cocks, since they are productive breeds that possess the non-barring trait. Defenders of Rhode Island Reds and New Hampshires say that over the course of a few years, productive purebreds will outlay sex-links. Sex-links provided an easy way to identify males, and the industry gained a reputation for destroying male chicks immediately, often through cruel and inhumane practices. Until then, it was just accepted that the ratio between male and female chicks would be half and half. You can expect Golden Comet hens to reach 5 or 6 pounds at maturity and lay between and eggs per year. Red Sex-Links What is known as the "silver trait" is found in hens of many, but not all, white-feathered varieties or breeds and some with silver lacing. A few unfortunate ones are only given numbers. Chicks were hatched out in the spring, and by early fall cockerels would be of a large enough size and still have tender meat. Barred Plymouth Rocks are by far the most commonly used hens, but any variety with barred or cuckoo feather patterns could also be used. The industrialization of chicken raising has led to a problem of too many roosters. That said, there could be some severe inbreeding in the parent stock developed by the commerical hatcheries. You can expect Red Sex Link hens to mature to 6 or 7 pounds and lay between and eggs per year. The main reason they are not included on the chart is because they are not actually chicken breeds. With crossing different breeds, as well, you eliminate the problems associated with inbreeding. If someone has documented this, I haven't seen the study. The hens lay big brown eggs. The hens lay large brown eggs. What works for the industrial giants, may not work if you try to do your own cross breeding -- or at least not as well as you might hope. Sex-linked cross-bred chickens have been developed for two main reasons: Roosters weigh 7 to 8 pounds.
Video about hatching sex link chickens:
Red Sex Link Chicken Parent Stock Breeds (Breeder Flock)
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