Document Detail

Season of the year influences semen output and concentrations of testosterone in circulation of yaks (Poephagus grunniens L.).
MedLine Citation:
PMID:  19157729     Owner:  NLM     Status:  MEDLINE    
Seasonal changes in plasma testosterone concentration and semen quality were evaluated in yak bulls throughout a 1-year period. Blood samples were collected every week from adult yak bulls (n=15). These blood samples were analyzed for testosterone using a highly sensitive enzyme-linked immunoassay. Ejaculates were collected from five representative bulls each week. Ejaculate volume, progressive motility, live sperm count and sperm concentrations were determined. Mean testosterone in plasma was 1.03+/-0.25 ng/ml. Concentrations of testosterone changed throughout the year (P<0.05) and were found to be highest during the winter. It was also higher during the autumn than in summer and spring (P<0.05). Mean ejaculate volume, progressive motility, live sperm count and spermatozoa concentration were 2.7+/-0.3 ml, 72.8+/-1.4%, 82.3+/-0.9% and 968+/-233 x 10(6)ml(-1), respectively. Ejaculate volume and sperm concentration were higher (P<0.05) in autumn than in other seasons. To conclude, a highly sensitive EIA for testosterone was developed and validated for yak plasma. Seasonal changes in semen quality were associated with changes in the concentration of testosterone in plasma from yak bulls.
M Sarkar; B K Dutta Borah; S Bandopadhayay; H H D Meyer; B S Prakash
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Publication Detail:
Type:  Journal Article     Date:  2008-12-24
Journal Detail:
Title:  Animal reproduction science     Volume:  115     ISSN:  1873-2232     ISO Abbreviation:  Anim. Reprod. Sci.     Publication Date:  2009 Oct 
Date Detail:
Created Date:  2009-08-03     Completed Date:  2009-10-26     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7807205     Medline TA:  Anim Reprod Sci     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  300-5     Citation Subset:  IM    
National Research Center on Yak, Dirang, Arunachal Pradesh 790101, India.
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MeSH Terms
Animal Feed
Cattle / blood,  physiology*
Ejaculation / physiology
Plasma / chemistry
Population Density
Rural Population
Semen / secretion*
Testosterone / blood*
Reg. No./Substance:

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