Document Detail

Temporal appearance of seasonal changes in numbers of Sertoli cells, Leydig cells, and germ cells in stallions.
MedLine Citation:
PMID:  2765623     Owner:  NLM     Status:  MEDLINE    
The temporal appearance of seasonal changes in numbers of Leydig, Sertoli, and germ cells was evaluated to determine if seasonally increased daily spermatozoan production might be preceded by changes in numbers of either of two somatic testicular cells. A significant increase in numbers of spermatogonia and Sertoli cells preceded the significant increase in number of Leydig cells in the approaching breeding season. Seasonal changes in parenchymal weight and in numbers of Sertoli cells, Leydig cells, and germ cells were maximal in May and June. Numbers of A or B spermatogonia in June were 2.4 to 2.5 times the number present in January. During the same time period, numbers of other germ cells, as well as Leydig cells and Sertoli cells, were increased by 1.5 to 1.9 times. The magnitude of change between January and March (first time period that the change was significant) was greater for A spermatogonia (1.7-fold) than for other cell types (1.3-fold to 1.5-fold). Hence, the need to accommodate more spermatogonial progeny might cause increased testicular size and number of somatic cells, including Sertoli cells. Season did not influence the rate of degeneration between A and B spermatogonia. However, in the breeding season, the conversion of B spermatogonia to primary spermatocytes was reduced. The lack of a seasonal difference in the ratio of primary spermatocytes per Sertoli cell was consistent with a limited capacity of individual Sertoli cells to accommodate primary spermatocytes.(ABSTRACT TRUNCATED AT 250 WORDS)
L Johnson; M E Tatum
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Biology of reproduction     Volume:  40     ISSN:  0006-3363     ISO Abbreviation:  Biol. Reprod.     Publication Date:  1989 May 
Date Detail:
Created Date:  1989-09-29     Completed Date:  1989-09-29     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0207224     Medline TA:  Biol Reprod     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  994-9     Citation Subset:  IM    
Department of Veterinary Anatomy, College of Veterinary Medicine, Texas A&M University, College Station 77843-4458.
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MeSH Terms
Cell Count / veterinary
Horses / physiology*
Leydig Cells*
Organ Size
Sertoli Cells*
Testis / cytology*
Grant Support

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