3 Homozygous Tobiano siblings in a Row

angrovestud

angrovestud

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Not once, not twice, but three times a true breeding tobiano Homozygous foal has been born at the stud.
By Ricco our very successful piebald stallion 16 .3hh 3/4 TB 1/4 I.D type, all foals out of Angrove Dance Girl 15/16th TB DNA verified by Weatherbys by the famous puissance winning TB showjumper Sarah's Pride sold to the USA

I have attached copy of an email from Dan Reeves from Animal Genetics to confirm the rarity.
horses at Angrove Stud.
Dear Heather

Congratulations on your recent run of horse DNA test colour results. As you are aware, the Tobiano Homozygous horse is a highly desirable breeding specimen, it has inherited the Tobiano gene and coat pattern from both parents, and therefore when bred is guaranteed to produce 100% Tobiano patterned foals (Piebald or Skewbald) regardless of the mate.

Although the Tobiano Homozygous horse is not massively rare, it is indeed sought after and often purpose bred. The case of your test results are however slightly more special, when two NON Homozygous horses are bred together, such as the parents of your foals, the offspring only have a 25% chance of being Homozygous themselves. It was a stroke of fortune that this happened just once, to happen twice in a row was certainly unsual, but to happen three times really is extraordinary. The likelihood of this happening three times was 1.56%.

In simple terms, the odds of your non-Homozygous horses to breed three out of three true-breeding coloured foals, in a row, were 1 in 64.

Thanks again for submitting the samples, and please feel free to contact us if you have any further queries.

Best Wishes

Dan Reeves
Animal Genetics UK
 
Well done, you have bucked the odds, if I were you I’d go buy a lottery ticket while the luck is flowing! But this sort of thing happens quite rarely so you are very lucky.

One of my mares is a chestnut carrier and in all three of her foals so far she has put forward her chestnut gene, bit shorter odds than yours, but last time I had a 25% chance of chestnut and sure enough I got it (nice foal though). So I am still waiting for a brown!

That’s why I am always careful to say a horse with one dominant colour gene is likely to pass it on to ABOUT 50% of its offspring because the odds do not always work out straight down the line unless you breed about 100, so you could get a grey mare that had only 4 foals none of which are grey.
 
Hi Eventrider, KarynK, and Friendly_horses that is very kind of you we are so delighted the first colt we bred we just thought wow! great then we bred a filly and she did not have the heavy spotting her big brother had and we were really suprised to learn that she was also Homozygous Tobiano, then we really were shocked when No 3 test results said he was as well.
We are very lucky as all three are the only grandchildren in the world by Sarahs pride before he was gelded he covered Angrove Dance Girl's Dam and she was the only resulting progeny. so yes we are very lucky.
I do not do the lottery maybe I ought to!
 
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