Pssm/ Appaloosa stallion question

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throughtheforest

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Am I right that in a half Appaloosa horse X gypsy cob if the sire is negative as a carrier of pssm then it's not possible/ very unlikely unless the dam is a carrier for that horse to have pssm? I did a quick Google and found that two owners on this forum have horses by Puzzleman which is the sire of the mare I'm currently going through the vetting process for, just wondering what your horses are like please.
Thanks in advance for your input.
 
Yes - its dominant Autosomal. So a negative sire and a heterozygous (one gene of each) dam has a 50:50 chance of producing a PSSM foal. A homozygous dam has a 100% chance.

But - it is dominant. So the Dam would have to also show PSSM. You can't carry this passively, as you do for HWS in Connies for example.

But there are also halotypes that tie up despite being n/n. It isn't yet fully understood.
 
Thanks for your input, it wouldn't even cross my mind to get a gypsy cob tested before buying one. I've never heard of a single one having pssm and they're the most common horse round here by far. Also would the homozygous mare have symptoms of pssm or can they be just a carrier without symptoms?
 
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For the pssm we know about (because it isn’t entirely resolved) if they are a carrier they have symptoms.

There are certainly plenty of cobs affected much of the time they get labelled as lazy, or difficult.
 
Symptoms vary in their severity. My mare who has one copy of the gene really struggles. She never ties up in the freezing to the spot sense, just stops a wanting to go forward. Bloods show elevated muscle enzymes.

My gelding has two copies of the gen. He's retired due to arthritis but never showed many symptoms. He's Ardennes and the mare is Appy x French draft. Lots of coloured cobs on the PSSM uk FB site
 
I would put your query on the FB "PSSM forum" including the name of the stallion. Whilst there are a lot of US people on there who have the expertise there are also a lot of UK people who may be familiar with your stallion and gypsy cobs.
 
throughtheforest said:
Thanks for your input, it wouldn't even cross my mind to get a gypsy cob tested before buying one. I've never heard of a single one having pssm and they're the most common horse round here by far. Also would the homozygous mare have symptoms of pssm or can they be just a carrier without symptoms?
Click to expand...

I think a lot go undiagnosed and are just labelled ploddy etc
 
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