Journal ArticleDOI
Reproductive exocrine and endocrine profiles and their seasonality in male langur monkeys (Presbytis entellus entellus).
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TLDR
The results suggest that the male langurs lack seasonality in their reproductive exocrine and endocrine profiles and thus could be used as model for research in human reproduction.Abstract:
The reproductive exocrine and endocrine profiles in male langurs are reported with an emphasis on seasonality. The animals showed positive response to electroejaculation throughout the year. The sperm concentration varied between 10-383 x 10(6)/ejaculation with wide fluctuations all through the year. No appreciable changes in the motility and percent live sperm were observed throughout the year. The levels of seminal fructose and magnesium remained unchanged throughout the year, while acid phosphatase showed wide fluctuations. Citric acid showed elevation during February and March and LDH showed elevated levels during April and May. The annual range of serum testosterone was 6-34 nMol/l with a peak during July. Cortisol ranged between 575-1587 nMol/l and prolactin ranged between 107-900 mU/l. Wide fluctuations were observed in hormonal levels. No seasonality was exhibited in the seminiferous tubule diameter, nuclear diameter of Sertoli cells and Leydig cells, and the cholesterol, glycogen, and sialic acid contents of testis. None of the parameters studied have shown any correlation with season. The results suggest that the male langurs lack seasonality in their reproductive exocrine and endocrine profiles and thus could be used as model for research in human reproduction.read more
Citations
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Journal ArticleDOI
Seasonal and social correlates of fecal testosterone and cortisol levels in wild male muriquis (Brachyteles arachnoides).
TL;DR: The lack of significant changes in testosterone levels with the onset of the rainy and copulatory season and the lack of prebreeding increases in cortisol may be related to the low levels of overt aggression displayed by male muriquis over access to mates.
Journal ArticleDOI
Seasonal and social influences on fecal androgen and glucocorticoid excretion in wild male long-tailed macaques (Macaca fascicularis).
TL;DR: The results show that male long-tailed macaques exhibit a distinct annual variation in both androgen and glucocorticoid levels, the first evidence that males of a non-strictly seasonal breeding species/capital breeder show endocrine patterns generally similar to those found in strictly seasonal/income breeders.
Journal ArticleDOI
Seasonal variation and social correlates of androgen excretion in male redfronted lemurs (Eulemur fulvus rufus)
TL;DR: The findings suggest that redfronted lemurs do not respond with increases in androgens to short-term challenges and that high androgen levels instead correlate with longer-lasting and predictable situations, such as the mating and birth seasons.
Novel mechanisms underlying neuroendocrine regulation of aggression: A synthesis of rodent, avian, and primate studies
TL;DR: This chapter reviews several novel neuroendocrine mechanisms that have been recently identified as being implicated in the regulation of aggressive behavior and specific focus is placed on studies conducted in rodents, birds and primates.
Journal ArticleDOI
Dose-Dependent Adverse Effects of Salinomycin on Male Reproductive Organs and Fertility in Mice
TL;DR: The results indicate reversible dose-dependent adverse effects of Salinomycin on male reproductive system of mice and suppressed expression of StAR and CYP11A1 proteins indicates inhibition of steroidogenesis.
References
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Book
The biochemistry of semen and of the male reproductive tract.
TL;DR: Bromural, Its Distribution and Decomposition In the Animal Organism, and its Differential Diagnosis from Neurological Disorders, Acta Neurol.
Journal ArticleDOI
Relationship between the content of androgenic steroids in the testes and the secretory activity of the seminal vesicles in the bull.
H. R. Lindner,T. Mann +1 more
Journal ArticleDOI
Seasonal rhythm in plasma testosterone levels in the rhesus monkey (Macaca mulatta): A three year study
Thomas P. Gordon,Thomas P. Gordon,Thomas P. Gordon,Robert M. Rose,Robert M. Rose,Robert M. Rose,Irwin S. Bernstein,Irwin S. Bernstein,Irwin S. Bernstein +8 more
TL;DR: The results demonstrate a correlation between seasonal breeding activity and increased levels of circulating testosterone in the rhesus monkey, and are supportive of the postulate that other seasonally observed behavior patterns (e.g., increased aggression) also may be mediated by higher testosterone levels.
Journal ArticleDOI
Circadian and circannual rhythms in plasma hormones and other variables of five healthy young human males.
Alain Reinberg,Michel Lagoguey,François Cesselin,Yvan Touitou,Jean-Claude Legrand,Annick Delassalle,Joséphine Antreassian,Alenka Lagoguey +7 more
TL;DR: In this article, every other month (plasma) and every month (urine) circadian rhythms were documented during the course of 14 months, and annual changes were validated in the 24-hour mean of: plasma FSH (annual crest time: February), LH (March), thyroxine (September), cortisol (February), renin activity (April), testosterone (October), urinary 17-hydroxycorticosteroids (March, aldosterone ( March), potassium (May), as well as sexual activity (September) [self-recorded daily].