Morphological studies on testicular development in the horse [Equus caballus]

Developmental changes of horse testis were examined morphologically. Spermatogenesis initiated in the spring of 2-year-old, and spermatogenic activity appeared to increase age dependently up to 9 years old. The characteristic feature of fetal testis is its large interstitial mass. The interstitial r...

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Bibliographic Details
Published inJournal of Reproduction and Development Vol. 44; no. 4; pp. 377 - 383
Main Authors Hondo, E. (Obihiro Univ. of Agriculture and Veterinary Medicine, Hokkaido (Japan)), Murabayashi, H, Hoshiba, H, Kitamura, N, Yamanouchi, K, Nambo, Y, Kobayashi, T, Kurohmaru, M, Yamada, J
Format Journal Article
LanguageEnglish
Published THE SOCIETY FOR REPRODUCTION AND DEVELOPMENT 1998
Subjects
ANATOMIA ANIMAL
ANATOMIE ANIMALE
ANIMAL MORPHOLOGY
BIOLOGICAL DEVELOPMENT
CABALLOS
CHEVAL
DESARROLLO BIOLOGICO
Development
DEVELOPPEMENT BIOLOGIQUE
Horse
HORSES
TESTES
TESTICULE
TESTICULOS
Testis
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Summary:Developmental changes of horse testis were examined morphologically. Spermatogenesis initiated in the spring of 2-year-old, and spermatogenic activity appeared to increase age dependently up to 9 years old. The characteristic feature of fetal testis is its large interstitial mass. The interstitial region revealed no proportionate change during the fetal period, but gradually decreased with age-dependency from birth to 9 Years Old. On the other hand, the area of seminiferous tubules/ showed no changes up to 1 year old. Most characteristic feature during development is the appearance/disappearance of pigmented cells. These cells first appeared in 3-day-old individuals and gradually increased in volume up to 1 year old (sampled in spring). The number of cells reached maximum at 2 months old, gradually decreased, and completely disappeared after 3 years old. The pigmented cells possessed large and small round bodies with various electron densities in the cytoplasm
Bibliography:1999002445
L53
ISSN:0916-8818
1348-4400
DOI:10.1262/jrd.44.377