This archived forum used to be called 'Peatarian' (in reference to Ray Peat).

"Ruminants detoxify PUFA" - Source and mechanism?

I've heard this claim, and I'm inclined to think that it's true, given the low PUFA content of ruminant fats.  I'd still like to see a source though, and the mechanism by which this happens.  

Additionally, it's kind of weird how especially cows, but also sheep and goats, tend to have somewhat "rectangular" hindquarters--not very accentuated at all.  

Horses and especially pigs, however, do.  Do you think this is a consequence of PUFA neutralization (horses and pigs aren't ruminants, and thus wouldn't neutralize PUFA), since PUFAs tend to be preferentially stored in the butt/thighs?
asked Apr 19, 2015 by lvysaur
I don't understand what the shape of a pig's ass has to do with anything.
Bigger butt = more butt fat = more PUFA

3 Answers

The rumen microbes biohydrogenate the PUFAs. But the ruminant animal may consume more PUFAs than can be biohydrogenated by the microbes, resulting in higher PUFA levels in its milk and meat. It reminds me by analogy of Peat's idea to try fully hydrogenated coconut oil!

I found the sources by searching for your phrase "Ruminants detoxify PUFA"."Ruminants+detoxify+PUFA"

Thanks for the idea!
answered Apr 19, 2015 by visionofstrength
The total pufa content of milk doesn't seem to vary wildly across temperature and diet, milk is tightly controlled. It does vary a bit and the pufa composition does vary, but it remains a product with high sat fat / pufa ratio and a few % of pufa. Just because a cow is healthier does not mean that there will be 0.5 grams less pufa in a quart of milk. However there are many other important differences influenced by diet that affect the milk quality and that should matter.
"I'd still like to see a source though"

nutrition data?
answered Apr 19, 2015 by Anon
It's hard to find studies that don't at the same time contain a bunch of misinformation through their idiomatic descriptions of what is going on, however, I think you are referring to the hydrogenation primarily of linoleic acid in the gut of cows etc - the result is CLA (conjugated linoleic acid).

If you search for information on how this is formed I think you'll get the picture.
answered Apr 20, 2015 by Marvel