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|Title:||Pathophysiology of Small Testes in Beef Bulls: Histopathological Features of Testes and Epididymides, Seminal Characteristics, and Endocrine Profiles (Testicular Hypoplasia, Degeneration, Breeding Soundness, Scrotal Circumference)|
|Author(s):||Veeramachaneni, Durga Nageswara Rao|
|Department / Program:||Veterinary Medical Science|
|Discipline:||Veterinary Medical Science|
|Degree Granting Institution:||University of Illinois at Urbana-Champaign|
|Subject(s):||Biology, Veterinary Science|
|Abstract:||Seventeen beef bulls (2 to 3 1/2 years of age) with a scrotal circumference (SC) ranging from 27 to 40.5 cm were used to study the pathophysiology of small testes. All four bulls having a SC of 30 cm) and azoospermic or oligospermic (and having a SC < 30 cm) bulls. However, in the latter group, the mean concentration of testosterone and the response to LH pulses, whether spontaneous or induced, were significantly lower. The fact that these bulls were not deficient in gonadotropins suggested that the impairment in Leydig cell structure and function was caused by local factors, either the factors that caused the tubular damage or those consequent to the tubular damage. Hence, Leydig cell failure in these bulls may not be the primary cause of germinal epithelial loss but an effect.
These findings indicate that "small testes" in postpubertal beef bulls will very likely have severe lesions and that the primary cause of "small testes" is not a deficiency of peripheral gonadotropins or testosterone.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1985.
|Date Available in IDEALS:||2014-12-16|
This item appears in the following Collection(s)
Dissertations and Theses - Veterinary Clinical Medicine
Graduate Dissertations and Theses at Illinois
Graduate Theses and Dissertations at Illinois