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Paper Information

Journal:   INTERNATIONAL JOURNAL OF FERTILITY AND STERILITY   SUMMER 2011 , Volume 5 , Number SUPPLEMENT 1; Page(s) 53 To 54.
 
Paper: 

EMBRYOLOGY: EFFECTS OF CHRONIC HEAT STRESS ON TESTICULAR STRUCTURES, SERUM TESTOSTERONE AND CORTISOL CONCENTRATIONS IN DEVELOPING LAMBS

 
 
Author(s):  RASOOLI A., JALALI M.T., NOURI M.*, MOHAMAMDIAN B., BARATI F.
 
* CLINICAL SCIENCES DEPARTMENT, VETERINARY MEDICINE FACULTY, SHAHID CHAMRAN UNIVERSITY, AHVAZ, IRAN
 
Abstract: 

Background: The objective of this study was to investigate the effect of high and moderate summer ambient temperatures on testicular structures and endocrine profile of developing ram lambs.
Materials and Methods: Twenty fall-born ramlambswere randomly divided into two groups: animalswere kept outdoor (n=10) under ambient temperature (31-50oC) or maintained indoor (26-32oC) from May to October 2007.Daily maximum ambient temperaturewas recorded for both environments. Monthly serum testosterone and cortisol concentrations were compared between two groups throughout the experiment. The animals were slaughtered at the end of the study and their testes subjected to histopathology exam.
Results: The results showed that maximum outdoor ambient temperature was significantly higher than indoor. There was no difference between two groups on serum testosterone concentration. There was no effect on serum cortisol levels except in August and October. Histolopathological examination revealed a severe testicular degeneration with significant germ line degeneration without any impact on somatic cells.
Conclusion: Direct exposure of developing lambs during non-breeding season impairs testicular germ cells without significant effect on testicular endocrine function.

 
Keyword(s): HEAT STRESS, DEVELOPING LAMB, TESTICULAR STRUCTURES, TESTOSTERONE, CORTISOL
 
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