Quote: I agree. In and out breeding is very effective. Yes, certain rules do apply across species. When we were breeding collies I ran trial pedigrees thru all kinds of systems for collecting virtue in pedigrees to see what would theoretically fall out of the tree. We used
percentage of line inheritance,
female family inbreeding, inbreeding, out-breeding, line breeding, rotational strain-crossing. , etc. with different combinations of sire/dam to see which would theoretically produce the best outcome. Just to see how excellence stacked up in the abstract. And the results proved out the projected excellence in the abstract.
Yes, poultry are different. They have a wider genetic base than dog breeds and many more sex-linked genes. Plus the color patterns, unlike most dogs, are required percentages which are stated in the Standard.
Certain rules still cross barriers. In racehorses and dogs there is female family inbreeding. In poultry we know to bring new blood in thru the hen. In dogs and poultry we know the value of the old rule , breed three generations in and then cross out. In dogs people will cross family strains during the "out". In poultry, Wid Card defines this suggestion as : breed three generation in and breed "out" by crossing to an ancestor of the same strain about 2-3 generations back in the pedigree. In poultry, we cross "out"
within the family strains because we want to keep the sex-linked genes and plumage patterns stable.
There are a bunch of classic poultry breeding pedigree systems out there. Part of the problem is the inventors presumed the breeders would be hatching 100-500 chicks a year. Frankly, that is beyond my means as a hobby breeder. Too many pens, birds and expense. I find Fleche's pedigree breeding chart very confusing. Then there was the BYC newbie who posted for help with his bantam Dark Leghorn breeding program 6 days ago. He inquired whether his diagram of criss-cross breeding would work and never got a response. He was seeking a program which would work with a small number of birds.
So what do we do? Those of us with a trio, a quad, a small flock who want to preserve a Heritage fowl?
How do we breed the very small flock? Part of the answer is in quality of the foundation flock. It
must be of the highest quality because you will be inbreeding part of the time. Superior birds from a proven show strain which has been line-bred for many years. If one is working with a breed which doesn't have this available, then the rest of this post is not for you, because you will have to practice complementary mating until your birds reach a point in perfection where this method will work for you.
Have a very clear idea of what you want to accomplish in the breed. This does
not include changing the breed in general because your genetic input is too small for that big pond. Decide what is
most important for you to improve in your breed.
Pick one or 2 things at most. 3 is too many, the genetic variables are exponential at that point. Health, breed silhouette, plumage color, production values. Or? These will be the "hallmarks" of your future strain. Tho we all breed for overall excellence, these one or 2 things will be what your future strain is known for. They will be what other breeders come to you to get for their flocks. Egg color does not count. It is a minor variable like eye color. In breeds where it is not crucial, it is unimportant. In breeds where it is, it is maintained by everyone, like eye and shank color.
Now, choose your strain in line with your ideas for the breed. Choose a strain which is strong in those areas, but not weak in other areas.
Make the plan first, then choose the strain. It is a "must have" to understand the genetic history of the strain. How it throws strengths and weaknesses. Which male and females "nick". What breeding schemes the creator has used in the past to concentrate virtue in the birds. Which schemes haven't worked. How feeding and management affect the bird's quality. If you can get the breeder to share his feeding regimen, treasure that secret and
don't share. It is money in the bank. Consult the breeder heavily for breeding advice for at least the 1st 3 generations until you get to know the strain.
However, you say, the breeder of my chosen strain hatches 100-500 chick a year. I can't do that. By the 3rd generation, you will understand which types of breeding programs to use with your birds within the number of birds you own.
The best breeders use most all of them depending on the needs of the flock. Presuming you have superior birds from a veteran line-bred , proven show strain, and are in need of a starting place, this method by Judge Wid Card is a proven one for concentrating virtue and producing "cookie-cutter" birds within a definite number of generations. It uses both in and out breeding and can be used with a starting flock as small as a trio. It can expand to a larger flock if wanted, but it's results lay in the power of the scheme itself, not the number of birds involved.
http://archive.org/details/cu31924003158312
Best,
Karen