|
Testosterone levels of tigers
|
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"!  (12-24-2018, 02:00 PM)Panther Wrote: 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.Unfortunately the Lion study doesn't break down group scores the way the Tiger study does. I also wish the Tiger scores were broken down by individual instead of pooling them. A few things I found interesting but not surprising are... -Big Cats become fully dominate specimens around the 6-10 range, these are the ones who will have their testosterone at their peak, they'll have had many battles throughout their life and have learned what it takes to hold a territory. -Gir Lions have a higher sperm defects than the other lions and tigers tested "girs are captive" and that means they are more susceptible to birth defects and they also have lower testosterone levels which may be the reason why they have scantly manes and aren't as physical imposing as their African Counterpart. -Even though Serengeti and Crater Lions have very similar test. levels, their manes still are quite different and climate plays a very large role in mane size, Crater lions have thick huge manes that grow over their shoulder quite often, my guess is the fact that the Crater is 10 degrees cooler year round than the surrounding Serengeti. 
The tiger study was taken by blood.
The lion one was by semen. We need a study for either blood or semen. Also.. we want all animals to be living in the wild. (12-24-2018, 11:39 PM)Pckts Wrote: Unfortunately the Lion study doesn't break down group scores the way the Tiger study does. Well, i didn't understand what you meant by "breaking down scores". But in the first lion-study, they separated adult male lions from subadults with different icons. But none of those scores higher than 2.5 ng/ml. Apart from that, I hadn't find one other study showing lion Testosterone level more than this. I'd like to see if there is one. And yes, I understand that the 6 year old cats are dominant and have their Testosterone level at their peak. So the average of 4 year old males (9.71 ng/ml) and 6 year old males(18.02 ng/ml) would be 14.0 ng/ml(14000 pg/ml). Still much higher than previously thought! Also, I personally think tigers have more testosterone levels of all bigcats. Due to their great territorial aggression and behaviour... (12-25-2018, 12:02 AM)Panther Wrote:(12-24-2018, 11:56 PM)paul cooper Wrote: The tiger study was taken by blood. The concentration of testosterone in blood plasma was greater than, and positively correlated with (r = .75, P less than .01), the concentration of testosterone in the ejaculate https://www.ncbi.nlm.nih.gov/pubmed/3194337 Testosterone concentration in semen from the 70 men investigated was 69 2 4 ngllOO ml, and in venous blood 487 2 20 ng/100 ml. However, in blood, one-third ofthis steroid was bound to testosterone binding globulin (TeBG), while no TeBG bound fraction of testosterone was found in seminal fluid. https://www.tandfonline.com/doi/pdf/10.3109/01485018208990230 "Also, I personally think tigers have more testosterone levels of all bigcats. Due to their great territorial aggression and behaviour..." All big cats are territorially aggressive
How about this study..
"n testosterone concentrations during and fol- lowing EE (Fig. 1) were similar (p>0.0S) between tigers (range, 2.12-2.76 ng/ml), leopards (1.19-2.61 ng/ml), and pumas (1.60-2.46 ng/ml). In contrast, the mean testosterone levels in cheetahs (0.3 3-0.54 ng/ml) were considerably less (p<O.Ol)." Source: https://www.google.com/url?sa=t&source=w...5679407279 However, this is based on capitive specimens. But still higher than that observed in wild lions from Serengeti and ngorogoro crater. Wild tigers posses much higher level of testosterone than this. As they were said to be having basal Testosterone of 3 folds higher than that of leopards.
Well I've looked through all those studies, but still haven't find a study of wild tiger testosterone levels nor lion testosterone concentration in blood.
But, this study (I mentioned in #1) gives some picture for the testosterone levels of wild tigers. As I guess this based on wild tigers and leopards. "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/ Testosterone levels we seen in capitive leopards ranging from 1.19-2.61 ng/ml based on the study mentioned in #7. Basically, wild leopards (which are territorial and independent) should have more testosterone than capitive leopards who ever had a territorial dispute, and not a independent life style. But measuring by these inferior values of capitive specimens, you can still get large figure for wild tigers... 1.19×3=5.88 ng/ml is the least value of wild tigers.. 2.61×3=7.83 ng/ml is the highest value for wild tigers. So, it's 5.88-7.83 ng/ml based on capitive leopards. Based on wild leopards, it'd be even more or not. But still it's a large figure, isn't it? Anyways, Merry Christmas to all of you guys!  (12-25-2018, 07:10 PM)Panther Wrote: Well I've looked through all those studies, but still haven't find a study of wild tiger testosterone levels nor lion testosterone concentration in blood.Hello Panther , I want to ask you something ? Do you have a Facebook or Instagram or messaging app you use for me, please? |
| Users browsing this thread: |
| 1 Guest(s) |