>>>>>>>>>>>>>>>>How many of you have bred a mare to a sire you admire, hoping of course you will capture some of his talent and presence in the foal, yet the foal has little resemblance to the illustrous sire? This is because the leading dominance in the foal was not the same as what made up the key qualities in the sire. Your foal is going to resemble the leading dominance in the genetics, and that can change with every breeding and every generation.
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from...
http://www.sport-horse-breeder.com/pedigree-study.html
>>>>>>>>>>>But what would happen if you found the female line to balance your overloaded male lines? And what if, that female was not just the sister, but the 3/4 or even better, the full sister? Then you would be well on your way to bringing back all that greatness that had been watered down.
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http://www.sport-horse-breeder.com/the-Mare.html
Evaluation done of the pedigrees in the Thoroughbred Industry revealed that particular pedigree patterns produce either better fillies or colts, and that there also was a difference between good breeding stock (both stallions and mares)when compared to the pedigree design of performance only winners. See Potency Primer page for more on this.
and...
http://www.sport-horse-breeder.com/potency-primer.html
Pedigree Structure Indicates Potential. Very few pedigrees are equally good for a filly or a colt. There are general rules about what makes a pedigree good, such as having full or 3/4 siblings is an excellent way to upgrade your horses, being almost a guarantee of outstanding performance. And having sex balanced line-breeding unlocks the full potential of a target ancestor. The extensive research that has been done in the Thoroughbred Industry has turned up some interesting statistics. For it seems, depending on the sex of the ancestor that is duplicated and sex balanced the result will be better for either fillies or colts.
Through studying thousands of pedigrees the researchers were able to identify pedigree patterns that were consistently present in the best performance horses and the best breeding stock. They established that the better fillies and colts have pedigree patterns that differ from each other.
The following is an outline of what they discovered: The statistics show, that good performance fillies or mares have multiple lines of daughters of a superior sire and/or both sons and daughters of an exceptional mare. These are called filly factors.
Better performance colts and stallions have the opposite: multiple lines of sons of a target mare, and/or sons and daughters of a superior sire. These are called colt factors.
Things get more complicated with breeding stock. For producing excellent broodmares a pedigree goal would be to include the filly factors mentioned above along with some colt factors. The colt factors are seldom a problem, usually being there already, often too many of them. It is harder to get multiple lines of a mare because mares produce far fewer offspring than stallions. It is a very unusual mare that has more filly factors than colt factors, but ideally that is what you want to create for a good broodmare. The best mares have a high number of filly factors, plus a slightly lower percent of colt factors.
Good stallions have the colt factors above but also carry a significant and strong filly factor(s). Your breeding stock - male or female, will benefit from the presence of strong filly factors.
No breeding is equally good for both sexes, so plan your matings accordingly.
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Repeat the Breeding. Once you have constructed what you believe is the best possible genetic combination for your sport horse foal, the experts advise that you repeat the breeding, at least once. Even Tesio did this, and the science of genetics backs this advice up.
Bowling said, "The random assortment of chromosome pairs during gamete formation means we can not predict the exact proportion of genes that any two siblings have in common."
Each of the genes can divide and combine in many variations and your first, or even second mating may not get the most beneficial shuffle of the genetic deck. If you are planning your matings correctly, even the lesser of the foals should be a very good horse, but the variation possible doesn't insure that he first foal will be the best of the bunch, so repeat the breeding, at least once.
very interesting...
http://www.sport-horse-breeder.com/Man-O-War.html