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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Published in | Journal of Reproduction and Development Vol. 44; no. 4; pp. 377 - 383 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
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THE SOCIETY FOR REPRODUCTION AND DEVELOPMENT
1998
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Abstract | 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 |
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AbstractList | Developmental changes of horse testis were examined morphologically. Spermatogenesis initiated in the spring of 2-year-olds, 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. 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 |
Author | Kurohmaru, M Kobayashi, T Murabayashi, H Yamanouchi, K Hoshiba, H Yamada, J Hondo, E. (Obihiro Univ. of Agriculture and Veterinary Medicine, Hokkaido (Japan)) Kitamura, N Nambo, Y |
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Cites_doi | 10.2527/jas1986.633854x 10.1016/0040-8166(77)90040-4 10.1095/biolreprod35.4.971 10.1530/jrf.0.0390115 10.1530/jrf.0.0880167 10.1095/biolreprod29.3.777 10.1530/jrf.0.0810227 10.1530/jrf.0.0400113 10.1095/biolreprod24.3.703 10.1002/ar.1090560308 |
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References | 2. Berndtson WE, Pickett BW, Nett TM. Reproductive Physiology of the stallion, IV. Seasonal changes in the testosterone concentration of peripheral plasma. J Reprod Fertil 1974; 39: 115-118. 5. Johnson L, Thompson DL Jr. Age-related seasonal variation in the Sertoli cell population, daily sperm production and serum concentrations of follicle-stimulating hormone, luteinizing hormone and testosterone in stallions. Biol Reprod 1983; 29: 777-789. 1. Swierstra EE, Gebauer MR, Pickett BW. Reproductive physiology of the stallion, I. Spermatogenesis and testis composition. J Reprod Fertil 1974; 40: 113-123. 8. Johnson L, Neaves WB. Age-related changes in the Leydig cell population, seminiferous tubules, and sperm production in stallions. Biol Reprod 1981; 24: 703-712. 13. Naden J, Amann RP, Squires EL. Testicular growth, hormone concentrations, seminal characteristics and sexual behaviour in stallions. J Reprod Fertil 1990; 88: 167-176. 11. Russell LD, Burguet S. Ultrastructure of Leydig cells as revealed by secondary tissue treatment with a ferrocyanide-osmium mixture. Tissue Cell Res 1977; 9: 751-766. 9. Cole HH, Hart GH, Lyons WR, Catchpole HR. The development and hormonal content of fetal horse gonads. Anat Rec 1933; 56: 275-293. 6. Thompson DL Jr, Johnson L, St George RL, Garza F Jr. Concentrations of prolactin, luteinizing hormone and follicle stimulating hormone in pituitary and serum of horses: effect of sex, season and reproductive state. J Anim Sci 1986; 63: 854-860. 3. Wiesner LM, Kirkpatrick JF. Seasonal and diurnal testosterone in wild stallions. Biol Reprod 1975; 13 (suppl 1): 93. 10. Gonzalez-Angulo A, Hernandez-Jauregui P, Marquez-Monter H. Fine structure of gonads of the fetus of the horse (Equus caballus). Am J Vet Res 1971; 32: 1665-1676. 4. Thompson DL Jr, Johnson L. Effect of month and age on prolactin concentrations in stallion serum. J Reprod Fertil 1987; 35 (suppl): 67-70. 12. Johnson L, Thompson DL Jr. Seasonal variation in the total volume of Leydig cells in stallion is explained by variation in cell number rather than cell size. Biol Reprod 1986; 35: 971-979. 7. Johnson L, Thompson DL Jr. Effect of seasonal changes in Leydig cell number on the volume of smooth endoplasmic reticulum in Leydig cells and intratesticular testosterone content in stallions. J Reprod Fertil 1987; 81: 227-232. Johnson L, Thompson DL Jr. (7) 1987; 81 Gonzalez-Angulo A, Hernandez-Jaureg (10) 1971; 32 Thompson DL Jr, Johnson L, St Georg (6) 1986; 63 Russell LD, Burguet S. (11) 1977; 9 ohnson L, Neaves WB. (8) 1981; 24 3 4 Johnson L, Thompson DL Jr. (5) 1983; 29 Naden J, Amann RP, Squires E (13) 1990; 88 Swierstra EE, Gebauer MR, Pickett B (1) 1974; 40 Berndtson WE, Pickett BW, Nett TM. (2) 1974; 39 Cole HH, Hart GH, Lyons WR, Catchpo (9) 1933; 56 Johnson L, Thompson DL Jr. (12) 1986; 35 |
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Snippet | Developmental changes of horse testis were examined morphologically. Spermatogenesis initiated in the spring of 2-year-old, and spermatogenic activity appeared... Developmental changes of horse testis were examined morphologically. Spermatogenesis initiated in the spring of 2-year-olds, and spermatogenic activity... |
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SubjectTerms | ANATOMIA ANIMAL ANATOMIE ANIMALE ANIMAL MORPHOLOGY BIOLOGICAL DEVELOPMENT CABALLOS CHEVAL DESARROLLO BIOLOGICO Development DEVELOPPEMENT BIOLOGIQUE Horse HORSES TESTES TESTICULE TESTICULOS Testis |
Title | Morphological studies on testicular development in the horse [Equus caballus] |
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