After sac oil has been jarred for a while it separates into a thick creamy tan color liquid & a dark oily liquid.

Is there any advantage or benefit to bottle separately & use one over the other in beaver lure or predator lures.

I just shake it up before pouring and use it like that. Works great. I never tried to drain off the separate the layers.

Same here.

Kind of like skunk essence. It will separate the liquid from the fatty content. Skunk essence fat has a very high weight density and is difficult to keep it suspended while pouring from a larger container. The skunk glands excrete essence that has been pre mixed and the yellow mustard makes the essence linger longer and hold fast.

Beaver oil over time has 2 basic elements that will separate.The light weight oil will surface and the fatty cream will separate to the bottom layer. This is the material that is kept mixed naturally due to the animals glandular activity keeping it blended so it is ready as needed. This oil blend is used to comb into the animals hair to keep it somewhat water resistant / repellent. If not, it would die of hypothermia since the body would not be able to maintain its needed body temperature in the cold water.

I keep oil from males and females separately, this way the female oil doesn't separate much and male oil is liquid to begin with.

Interesting.

I've never noticed this, but I'm gonna check this out.

maybe it's different with your species but in European beaver, females produce paste-like gray oil and males produce yellowish liquid oil. Even the sac wall structure is different. It's an easy way to define the sex of the beaver in the field, by how wobbly the area below the pelvic ring is. Castors are the same in both sexes.

It's the opposite with the beavers I have caught here. The females tend to have the runny oil and the males tend to be more paste like. I'm curious about why there would be a difference.

Interesting, yes.
must be the genetics.
yours have 40 chromosomes and ours have 48. Fur seems to be a bit different, too

This is one of those things I’ve paid attention to but never stored it in the memory bank. I read Tatiana’s post yesterday and found it interesting, I’m sure as most. Well I happen to have pulled 3 beaver out of a nuisance job today (the dam has to be 10 foot tall, it’s a beauty) , 2 of which were males and 1 female. While I was milking the oil sacs I paid closer attention and sure enough the female was grayish in comparison to the more yellowish males. To me, it doesn’t matter much, seems to smell the same at the end of the day. But definitely an interesting thing to pay closer attention to, merely out of curiosity now.

To me the difference in smell is significant. Male oil is more sharp, cheesy and rancid-smelling (butyric + caproic acid?) and female oil is more pleasantly musky and a bit sour. I think there is a major difference in the fatty acid composition which explains the differences in the smell and physical properties. Male oil is fluid at body temperature and female oil is often thick like play-doh. Also, many volatile aroma substances are derivatives of fatty acids, chemically.

but again I'm not a real trapper and have no idea how to use this information or if it has any value. I don't even know why I'm collecting the oil. Probably to make decluttering more fun for my parents when I'm dead

I never thought of oil smelling different from different sexes, I use the sac oil straight for an attraction for beaver. The sacs and oil I don't use for beaver I put in meat bait, Iam gonna pay more attention to separating the sacs by sex.

Ive never seen sac oil that looks like that grey thick paste in Tatiana's pic.....and I've squeezed out 100s of oil sacs over the years.

I have done thousands of sac pods. Never any grey material. All tan to creme colored.

Interesting.

I still think it's very possible that there is a difference of oil composition between males and females in the North American beaver, because the two species are very close.

Could also be a population thing, with differences between populations. Our beavers are not diverse genetically, most originate from a single remaining population in European Russia (Voronezh), with the exception of two small populations of indigenous subspecies that are failing to trhive.

With our beaver, the difference of the oil is documented zoologically. Female oil is not only thicker, it's not homogeneous sometimes and has impurities such as hairs. Ontogenetically anal glands are involuted pouches of skin with modified sweat and sebaceous glands, so the presence of hairs is not surprising.

The whole thing appears to be poorly studied and is probably worth investigating.

Tatiana, I love your teacup

thanks, it's pretty gay.
I like cute animals.

I noticed long ago that female and male oil from the sacs is completely different. No exceptions. Female oil is more solid and even granular much like vaseline in color and texture and density (although sometimes it can be a little runny). Male oil is brownish and more like 90 wt oil.

I sell my extracted oil to a lure dealer mixed together and he loves it.