Sardines and thiaminase question

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A lesson in- unconditionnal- love
Barked: Sat Aug 14, '10 4:57am PST 
"Some fish contain thiaminase an enzyme that destroys thiamine, an essential B vitamin. I am sure you would have to feed mostly sardines, mackerel or some other thiaminase containing fish for this to be an issue."

Maxwell wrote the above in another thread.

More info please?

I feed frozen whole sardines, (a 750 gram bag) once a week. Is this an issue?

Laila gets lots of pork, 3 times per week it is pork she gets (plus pork heart and kidney regularly), which is rich in thiamine... does it make up for the thiaminase issue?


I'm triple- superior MAD- now!
Barked: Sat Aug 14, '10 8:56am PST 
I just feed them in separate meals is all. Once the sardine is digested that enzyme shouldn't be an issue any longer, right? This is just something to consider, you know how it is possible to go to extremes feeding raw. If sardines are good then more sardines is better may not be a good idea.

If I had access to a lot of cheap fish I just might consider which species to feed is all. Feeding any fish once a week is fine, >25% of the diet is something else entirely.

Here is a article with info.
And I put the Cornell article into the wayback machine and here it is.
http://web.archive.org/web/20080616020904/http://www.ansci.corn ell.edu/plants/toxicagents/thiaminase/thiaminase.html

Proud to be a- kitchen wolf!!!
Barked: Sat Aug 14, '10 11:04am PST 
laugh out loud I think you should count yourself lucky you can plunk down over a pound and a half of sardines once a week. I'd have a revolt on my hands if I tried that here.

No seriously, I wouldn't worry about the thiaminase thing. Notice the article is about feeding turtles, and concerns with feeding fish that contain that enzyme because that's what you feed ALL THE TIME. This kind of interaction in food chemicals is precisely the reason why ensuring some variety of proteins and sources in the diet is a good thing unless perhaps you can source totally "natural", totally ideal prey animals for food.


A lesson in- unconditionnal- love
Barked: Sat Aug 14, '10 11:56am PST 
thanks to both of you!