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I will
apologize up front that the explanation seems so long, and
some of you may want to skip down to Examples 2 and 3.
I am happy to help anyone determine what % of Arenosa their
horse is. Contents:
A. Important
Background Information
1. What is an Arenosa
Horse or Pony?
2. About Heredity B. A horse (or human) inherits 50% - no
more and no less - of its genetic material from each parent.
An example to apply the principles above: My maternal grandfather is 100% Welsh. I can
only inherit genetic material from my parents,
so I have to figure out what % of Welsh my
mother is. She gets half (1/2) of her genetic
make-up from her father, which makes her: 1/2 x 100% (from her father) =
50% Welsh I get half of my genetic make-up from my
mother. This makes me: 1/2 x 50% (from my mother) =
25% Welsh It doesn't matter that my grandfather's
parents and grandparents were all 100% Welsh.
Their genetic contribution can ONLY be made
through my mother. My mother can only get
50% (no more and no less) of her genes from her
father, and, since her mother was not Welsh, she
cannot be more than 50% Welsh and I cannot be
more than 1/2 x 50% = 25% Welsh - no matter how
many Welsh ancestors there are in her father's
background.
3. Common Mistakes B. The number of Arenosa Horses in a pedigree
does not matter. Only the % of genetic
material/influence passed down. A
horse with 4 great-grandparents that were bred by Audrey
Barrett is a SMALLER % Arenosa than a horse with 2 parents
that were bred by Audrey Barrett. The NUMBER of
Arenosa ancestors doesn't matter. It is the % of
genetic material that has been passed down that matters.
C. Not all "of Arenosa" horses were bred by
Audrey Barrett. While almost all
horses whose registered names end in "of Arenosa" were bred
by directly Audrey Barrett and therefore are 100% Arenosa,
there is another farm that recently started using this name.
There are also rumors that Audrey Barrett may have allowed
other farms to use "of Arenosa" in their horses' names.
It doesn't mean these horses are not Arenosa-bred, but you
may need to do further research to determine if an "of
Arenosa" horse was actually bred by Audrey Barrett and, if
not, what % Arenosa that horse actually is. D. Horses with the name
"Kewpie" may not be Arenosa-bred Horses. Another
very common mistake is to assume horses with the name
"Kewpie" are Arenosa horses. While some "Kewpie"
horses were OWNED by Audrey Barrett, they were not
necessarily BRED by Audrey Barrett, and therefore are NOT
Arenosa horses. B. Example 2: Horse A - 50% Arenosa Example 2: Horse A - 50% Arenosa 1. Horse A's Dam
C. Example 3:
Offspring of Horses 1 & 2 - 43.75% Arenosa Let's try a complicated pedigree. Example 2: Offspring of Horses 1 & 2 will
be 43.75%
Arenosa Okay if that made you want to tear your hair out, try
this one. Remember: Each horse gets 50% of its genetic
material from its sire and 50% from its dam. For this example, you want to determine what % Arenosa
the offspring of Horse 1 and Horse 2 will be. 1. You research the pedigree of Horses 1 & 2
(below) and find that 8 horses were bred by Audrey Barrett:
Horse
9, 13, 17, 18, 19, 23, 27, 28.
Each of these horses is 100% Arenosa. Once you have identified a horse as 100% Arenosa, you do
not need to consider any of that horse's ancestors. (A line cannot
contribute more than 100%!). (For more
information on this principle, see Example 1 above). Cross
off all ancestors of 100% Arenosa horses. This leaves you with
five (5) 100% Arenosa Horses to consider: 9,
13, 17, 18, 23.
2. Next, start with earliest generation where
there are 100% Arenosa horses that are not crossed off and figure
out the % of Arenosa of each of their OFFSPRING. The earliest
100% Arenosa horses are among the Great-Great Grand Parents in this
example, so we will start by figuring out the % Arenosa of each of
the Great Grand Parents. We are finished with the Great-Great Grandparents,
so the pedigree now looks like this: 3. Now figure out the next generation - the
Grand Parents: We are finished with the Great-Great Grandparents,
so the pedigree now looks like this: 4. Now figure out what % Arenosa each parent is: 4. Finally, determine what % Arenosa the offspring
of Horse 1 and Horse 2 will be: 1/2 x 50% = 25% Horse 2 contributes the other half of the genetic
material: 1/2 x 37.5% = 18.75% Offspring of Horse 1 & 2 will be: 25% +
18.75% = 43.75% Arenosa In case you are interested, here are the percentages of
all of the horses in pedigrees for Horses 1 & 2: If you compare Examples 2 and 3, you will notice that
Example 2 has only 1 Arenosa ancestor, and yet has a higher % of Arenosa
breeding than Example 3, which has 8 Arenosa ancestors! Again, I'm happy to help anyone figure out the % of
Arenosa breeding of their horses. But for those of you
who prefer to do it yourself, I hope this has been helpful. |
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