What are the testosterone levels of varying animals?

[paul cooper]

(12-31-2017, 08:37 AM)Polar Wrote: An average prime human male in his 20s has around 500-650 ng/dl of testosterone, and you are right that a male lion's or tiger's testosterone can be several times lower than that (180 ng/dl from captive Asian lion and 250 ng/dl from wild African lion pride leader from Kenya). Those are only two figures. I don't know any estimate for either a captive or wild tiger, but a fully-grown male black bear during both the spring and fall seasons can have anywhere from 1000-1250 ng/dl. Again, very limited data for test levels.

Whatever the case, the testosterone receptors of big cats are extremely powerful to allow them to even process that low amount of testosterone. Carnivores gain muscle and mass so much more quickly than we do. Testosterone receptors can vary in strength depending on built-in genes for testosterone regulation.

The only problems here are:

1) I am still looking hard for testosterone measurements of either captive or wild tigers. Very hard to find.

2) Tigers may vary by testosterone amount like they do in size; lions are a much more constant size. Normally, larger animals require more testosterone since they have plenty more hormone/blood pathways. So the results for tigers can vary quite a bit regarding size.

Boldchamp told me the lion and tiger have similar testosterone levels. Reply