I’d like to try making some BTO. Do you chunk up the entire tail or just trim off and use the fattiest parts? Does the skin need to be removed?
Any info or pointers would be appreciated.

I use the whole tail, I do not remove the skin. I cut cubes 3 * 3 cm. I put everything in a jar and put it in the sun.

What animals do you use the oil to trap in Russia?

I took a five gallon bucket and filled it with beaver tails chunked into one or two inch squares last year (I used a hatchet on frozen tails, so not precise) and set it in the sun. First time I've ever sun rendered something in a five gallon bucket instead of a glass container. I drew a couple quarts of oil off of it last fall, but was surprised at how little the tail chunks had broken down in that time. I suspect I will get a lot more oil out of that bucket as it continues to break down (I didn't take all that was in there, just dipped the clear, dark stuff off the top, but the tail chunks were still filling the bucket, hadn't broken down enough to settle much yet.) I did skin, bone and all.

In a jar will gasses develop?

I use tail oil for marten and badger

Yes

I do the same
When I'm done rendering I use what's left for canine bait.

Thanks everyone.
I’m dreaming up a bait of deer liver, beaver meat, castor, and BTO - all harvested myself.
Then I’m going to use it without testing it just to drive Yes Sir nuts! (JK Yes Sir, you’ve busted my ballz before but I’ve grown to appreciate your knowledgeable posts)

your killing me
Might try some sac oil also. My experience when it comes to K9s its more valuable than castor. Think it was Carmen that said in his book castor is over rated when it comes to K9s. But im.sure everyone has seen this in there testing.

Plan on adding some fly cerin. That BTO will gel up in the cold.
Matt

Thanks Yes Sir, I’ll try that.
Thanks MattDoyle, assuming you meant glycerine, was also planning to add SB and MP to preserve.

BTO…. You ain’t seen nuthin yet, ba ba ba baby…
Sorry, I always hear that song when I see those letters.

Anyways, my tail chunks have been festering since early July and I’m getting ready to collect.
Any advice on how much SB and/or MP to use per quart of oil?
And I think I saw somewhere that the leftover tail pieces were good in a dirthole, how much SB and MP?

Thanks for any advice.

The straight Bto shouldn't need any preservatives

I've got a jar of leftovers from making BTO in the cellar that's two years old with no preservatives and it's still fine. Plan on using it in a couple weeks for fox and yotes

Thanks Sir! Thanks Turtle!

Before and after, 3 months

I have bto that is 3 years old, no preserves are needed.