- We know that the testis has its own temperature balance system(thermoregulation ) which makes the temperature less than the temperature of the body for the completion of the process of producing the testis.
Dear Hala.
I can give you an example with bull.
In chapter (Scrotal/Testicular thermoregulation and the effects of increased testicular temperature in the bull), which is in Veterinary Clinics of North America: Food Animal Practice, Volume 13, Issue 2, 1997, 271-288 you can find information that rising temperature increases temperature of scrotum and this is connected with impaired spermatogenesis.
Hope this helps.
Regards,
Jiri
Let me continue the question. In accordance with the data that led in the response of Dr. Jiří Šichtař, we must observe the inhabitants of countries with hot climates a lower birth rate than in countries with a comfort temperature. However, statistics show that it is in countries with a hot climate that traditionally high birth rates are observed. How to explain this natural phenomenon from the point of view of supposedly "reducing spermatogenesis"?
Hello,
As a reply to Prof. Vladimir A. Kulchitsky,
I can think of two explanations:
1. Humans, such as all animals, adapt to environmental conditions. So maybe populations living in hot climates from generations are more resistant to caloric stress at the testicular level. Moving a man from a Nordic country to Middle Africa would probably be a good way to see how caloric stress affects spermatogenesis.
2. I don’t want to start any controversy, but countries in hot climates are generally countries in course of development, with some lower levels of education and and some lower birth control, so populations reproduce more intense. The developped countries from the “moderate” climates have lower birth rates because people don’t want many children (if any), not because they can’t (excluding cases of infertility, of course).
I really hope I haven’t insulted anyone with explanation #2 and I apologize if anyone feels offended. Anyone who wants to contradict me is welcome to do so.
my field observations indicate that most rams became sterile in hot weather
the testicular cremaster muscle and pumpiniform venous plexus play an important role to kept the temperature within testicle parenchyma, in addition that the testicular artery separated alone within sheath from other structure of spermatic cord, all these factors responsible to kept spermatozoa from the physical effect of high temp.
The testicle is often inside a bag outside the animal's body so as not to be exposed to abnormal heat because it causes damage to the sperm
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