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Post by King Kodiak on Nov 14, 2020 10:29:57 GMT -5
Exactly, just lean mean machines. Anyhow, we also have some brown bears that weight between 1000 and 1500 lbs in Spring when they leave hibernation, and also Summer. We have everything.
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Post by brobear on Nov 14, 2020 11:01:06 GMT -5
Summertime grizzly comparable to a tiger in his fat ratio percentage. Some great information guys; thanks.
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Post by King Kodiak on Nov 14, 2020 11:14:34 GMT -5
What these guys think? That big cats have no fat? I will be willing to bet that a 600+ lb tiger or lion has a fat percentage comparable to a bear in late fall. Difference is a bear is built to deal with the fat, cant say the same for the big cats.
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Post by OldGreenGrolar on Nov 15, 2020 0:23:28 GMT -5
Every animal does have some fat. The animals with the least among of fat are probably birds.
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Post by brobear on Nov 22, 2020 9:45:55 GMT -5
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Post by brobear on Nov 22, 2020 9:51:03 GMT -5
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Post by brobear on Nov 22, 2020 9:52:09 GMT -5
Reply #21 & #22 credits to Warsaw.
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Post by theundertaker45 on Nov 22, 2020 9:55:53 GMT -5
Warsaw shared great data here; barren ground grizzlies seem to be lean and mean machines in spring/summer; and yes, these are the bears who regularly take down adult muskoxen. All of those uneducated wimps insulting bears as "fat prey items" can crawl back to their caves and whipe off their tears.
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Post by King Kodiak on Nov 22, 2020 10:15:08 GMT -5
So a 3 year old, 160 kg male tiger had 30 kg of fat. 19% of his body weight. Damn, and they say bears are fat? Ha ha ha ha. That is basically the same as the average for bears.
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Post by theundertaker45 on Nov 22, 2020 10:20:18 GMT -5
Comments ridiculing other animals will be edited, that's immature.
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Post by King Kodiak on Nov 22, 2020 10:24:19 GMT -5
Take it easy Taker, just having some fun. They ridicule bears all the time. So am just striking back.
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Post by theundertaker45 on Nov 22, 2020 10:25:59 GMT -5
They can do it on their amateurish and for the most part poorly moderated platforms; we are reasonable people and won't get down to their level.
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Post by King Kodiak on Nov 22, 2020 10:33:35 GMT -5
Ok, but now we have very good items to show when the "fat" discussion appears. We have the report i found at reply #14 showing that the fat percentage is around 16-22 % in Summer for Yellowstone grizzlies, and now we have that account above that Warsaw posted of the 3 year old subadult tiger having a 19% body fat.
Two awesome items.
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Post by King Kodiak on Nov 25, 2020 14:13:12 GMT -5
According to Polar, male polar bears between 1000 and 1300 lbs have a body fat percentage of 20-28%. Not much for a bear that size in my opinion: this is great data.
POLAR: Polar bears are generally fatter year' round, unlike other northern bears who get fatter depending upon the season. From what I've seen (I also have data on this), polar bear males of 1000-1300 pounds have a bodyfat percentage of 20-28%. Brown bears are probably around that during the beginning of their hibernation. Are you able to get any studies or other information from ShaggyBoard forums for brown bear bodyfat percentages in differing seasons? As an old Inuit hunter said, "A healthy polar bear is one with a good deal of blubber." Polar bears really don't know when they will get their next meal: it's a simple matter of life or death in the Arctic regions these days. The fat keeps the bear's nutritional needs filled till the next hunt. wildfact.com/forum/topic-bear-size?pid=22928#pid22928
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Post by theundertaker45 on Nov 25, 2020 14:16:00 GMT -5
That would be slightly lower than black/brown bears in late fall, thank you for sharing that, Kodiak!
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Post by King Kodiak on Nov 25, 2020 14:23:00 GMT -5
That would be slightly lower than black/brown bears in late fall, thank you for sharing that, Kodiak! Yeah, and the polars at 1000-1300 lbs are around doble or even close to triple the weight of the Yellowstone bears. clearly, this is because male polars dont hibernate, thus they have those high weights with little fat percentage all year round.
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Post by brobear on Nov 25, 2020 15:05:14 GMT -5
However, polar bears need that fat layer to act as both insulation and buoyancy.
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Post by OldGreenGrolar on Nov 25, 2020 19:13:02 GMT -5
The polar bear does have fat and a thick double layer coat to protect itself from the extreme cold. However, it’s percentage of body fat seems to be lower than both a brown bear and black bear especially before and during hibernation (of these two bears).
Only pregnant female polar bears hibernate.
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Post by OldGreenGrolar on Nov 28, 2020 8:32:56 GMT -5
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Post by OldGreenGrolar on Nov 29, 2020 6:44:34 GMT -5
If Polar Bears Can Eat A Ton Of Fat And Be Healthy, Why Can't We? Lots of swimming in icy seas may have helped bears evolve to eat a high-fat diet yet remain healthy. If you were a bear and wanted to make a go of it in the frozen North (think polar bear, of course), what would you need to survive? White fur would help, to help you sneak up on prey. Also plenty of body fat to stay warm. And you'd need great stamina to swim many miles from one ice floe to the next. And there's another important trait, researchers reported Thursday: Polar bears have genes that help them live on a diet that's overloaded with fat — without suffering the sorts of human diseases that typically come with a diet of that sort. The study notes that a baby polar bear drinks milk that's 27 percent fat (forget the 2 percent we get from the carton). Adults feed mostly on blubbery seals. And that allows them to build up so much insulation that bears can be 50 percent fat by weight. Yet you never hear of a polar bear being rushed to the hospital with a heart attack. More to the point, it's unlikely that polar bears could survive as a species if they hadn't developed an ability to live on a high-fat diet. So what's going on? Researchers reporting in the journal Cell say they've found clues in the genes of polar bears. The international team has taken a close look at the polar bear genome to understand how this species split off from its close cousin, the brown bear. As you would expect, they find that the genes related to fur color have mutated. In fact, the changes occur in a genetic region that's linked to a human condition called Chediak-Higashi syndrome, which causes loss of pigment in the skin and eyes. But the genes that seem to be key to polar bear evolution are those involving how these animals handle their fatty diet. To cite just one example, a gene called VCL is linked to heart disease in humans. But in polar bears, this gene has undergone a dramatic evolution, compared with the VCL gene in the brown bear. We could keep on going down the alphabet-soup list of genes, but you get the idea. "Based on this evidence, we argue that potentially important reorganization of the cardiovascular system has taken place in polar bears since their divergence from brown bears," the authors write. The genes in question might not simply help bears pack on the pounds without ill effect; the rapid genetic changes might also have been driven by the long-distance swimming that polar bears do. Bears that have cardiovascular genes that help endurance are presumably at an advantage, so those genes are more likely to be passed on to future generations. Exactly what this means for human health isn't clear. Yes, there are hints about genetic traits that make bears less susceptible to heart disease. But we aren't bears. That said, the authors note: "It certainly encourages a move beyond the standard [rodents used in research] in our search for the underlying genetic causes of human cardiovascular diseases." They don't have direct evidence that these genes help the polar bears, according to Rasmus Nielsen, an evolutionary geneticist at the University of California, Berkeley who led the study. "It's not the kind of animal you can take into the lab and do experiments on," he told Shots. Instead, they're hoping to take some of the polar bear genes and some of the brown bear genes and swap them into mice, to see what effect they have on their cardiovascular systems. Oh, one last thing. This paper suggests that polar bears evolved quite recently — just 400,000 years ago. That may prove to be contentious. Another recent study puts the split between brown bears and polar bears at 4 million to 5 million years ago. Nielsen hopes his more detailed study has settled the matter, but Charlotte Lindqvist, an assistant professor at the University of Buffalo and author of that 2012 study, told me later by email: "I am quite sure this is not the last word about the time of origin for the polar bear." www.npr.org/sections/health-shots/2014/05/08/310731287/if-polar-bears-can-eat-a-ton-of-fat-and-be-healthy-why-cant-we#:~:text=Live%20Sessions-,If%20Polar%20Bears%20Can%20Eat%20A%20Ton%20Of%20Fat%20And,ways%20to%20treat%20human%20obesity.
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