Testosterone levels of tigers

[Panther]

Tigers are one of the more territorial bigcats. And are even more territorial than many bigcats. Most of the territorial battles between tigers were ended in death than that of lions or any big cats. Showing how Territorial they were, actually. 

Many people think lions having more testosterone level than that of tigers, based on a study of capitive specimens. Where it gives mean of 1850 pg/ml for Asiatic lions and 1720 pg/ml for tigers.

But the other study showing other wise. The following study gives the values of 9.71 ng/ml for 4 year old males and 18.02 ng/ml for 6 year old males. That is 9710 pg/ml  and 18020 pg/ml. Much higher than previously thought. 

*This image is copyright of its original author

Source: https://www.google.com/url?sa=t&source=web&rct=j&url=http://www.jakraya.com/journal/download.php%3Ffile%3D5-ijavsArticle_1.pdf&ved=2ahUKEwj999r097ffAhVGOSsKHSJXAdYQFjAAegQIAxAB&usg=AOvVaw3__bE074bjN3JyHE8aAXSg&cshid=1545636308304

The following study, sounds familiar to that value...

"Frequent blood samples were collected to study hormonal responses to GnRH in male and female leopards and tigers. Animals were anaesthetized with ketamine-HCl and blood samples were collected every 5 min for 15 min before and 160 min after i.v. administration of GnRH (1 micrograms/kg body weight) or saline. No differences in serum cortisol concentrations were observed between sexes within species, but mean cortisol was 2-fold greater in leopards than tigers. GnRH induced a rapid rise in LH in all animals (18.3 +/- 0.9 min to peak). Net LH peak height above pretreatment levels was 3-fold greater in males than conspecific females and was also greater in tigers than leopards. Serum FSH increased after GnRH, although the magnitude of response was less than that observed for LH. Basal LH and FSH and GnRH-stimulated FSH concentrations were not influenced by sex or species. Serum testosterone increased within 30-40 min after GnRH in 3/3 leopard and 1/3 tiger males. Basal testosterone was 3-fold greater in tiger than leopard males. LH pulses (1-2 pulses/3 h) were detected in 60% of saline-treated animals, suggesting pulsatile gonadotrophin secretion; however, in males concomitant testosterone pulses were not observed. These results indicate that there are marked sex and species differences in basal and GnRH-stimulated hormonal responses between felids of the genus Panthera which may be related to differences in adrenal activity."
Source: https://www.ncbi.nlm.nih.gov/m/pubmed/3123664/

While that of lions, wasn't reaching that range. When I looked up.
The following study shows the testosterone of wild male lions from Serengeti and ngorogoro crater lions.

*This image is copyright of its original author

Source: https://www.ncbi.nlm.nih.gov/m/pubmed/1899889/

And this study...

*This image is copyright of its original author

Source: https://www.google.com/url?sa=t&source=w...Tnkwvj5vdu

These two sources giving the value of 2.5 ng/ml(2500 pg/ml) for wild adult male African lions. 

That is almost more than 3 times lower than that observed in Bengal tigers.
These values showing that tigers posses higher level of testosterone of all big cats..


I need the opinions of you guys. No harsh "versus" debate, just a discussion about "testosterone levels"! Reply