In chickens this vigor translates in part to being extremely productive as egg-layers coupled with high feed efficiency. Although the males are consistently Rhode Island Reds or New Hampshires, for the silver-factor in the mother, several different breeds and varieties have been experimented with. They are sweet birds with docile, non-aggressive personalities. A few unfortunate ones are only given numbers. Black Sex-Links Black Sex-Links are bred by crossing females that carry a sex-linked barring trait with males do not carry the sex-linked barring trait. Although experiments with sex-linked inheritance in chickens have been conducted for more than years, the development of commercial sex-linked hybrid strains started largely after World War II. This page authored and maintained by John R. The rich color diminishes over time, but that is true of other hens. Unlike the Red Sex-Links, there is a more subtle difference between the sexes at hatching.
With crossing different breeds, as well, you eliminate the problems associated with inbreeding. Although the males are consistently Rhode Island Reds or New Hampshires, for the silver-factor in the mother, several different breeds and varieties have been experimented with. It works best, of course, if you start with very productive breeds. The discovery of a means to distinguish between the sexes revolutionized the industry. Although the non-silver color is almost always red, that is simply because Rhode Island Reds and New Hampshires, being very productive breeds, are most often used. The rich color diminishes over time, but that is true of other hens. 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. Chicks were hatched out in the spring, and by early fall cockerels would be of a large enough size and still have tender meat. Amber is also used, but the difference between a Dekalb Brown and a Dekalb Amber is beyond me. None of ours have gone broody. Even the diversity of sex-links has decreased in recent years. Under the new model, it was not cost effective to raise males of layer breeds. 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. They have been among the best winter layers. The sexual dimorphism lasts for one generation only. 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 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. Some pullets, when first starting to lay, have produced quite dark eggs. Defenders of Rhode Island Reds and New Hampshires say that over the course of a few years, productive purebreds will outlay sex-links. Forums can be very handy sources of information about raising chickens, but they can also be particularly frustrating when they provide confusing and conflicting information. They accepted that hens would lay enough eggs for home consumption and enough extra, perhaps, to supply neighbors. Unlike the Red Sex-Links, there is a more subtle difference between the sexes at hatching. It was discovered early in the selective breeding of domestic animals that hybrid offspring can be more physiologically robust. Both are mostly black, but males will have a white spot on the head. As cross-breeds, they are mongrels and cannot be entered in sanctioned poultry shows. Black Sex-Links Black Sex-Links are bred by crossing females that carry a sex-linked barring trait with males do not carry the sex-linked barring trait. We have noticed a drop off in egg production among our Comets, but we haven't tested it against our New Hampshires, and the only Rhode Island Reds we've owned have been Production Reds.
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