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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
01/08/1992 |
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Data da última atualização: |
28/11/2023 |
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Autoria: |
YAO, T. S.; EATON, O. N. |
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Título: |
Postnatal growth and histological development of reproductive organs in male goats. |
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Ano de publicação: |
1954 |
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Fonte/Imprenta: |
American Journal of Anatomy, v. 95, n. 3, p. 401-431, Nov. 1954. |
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Idioma: |
Inglês |
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Conteúdo: |
The testis, epididymis, ductus deferens, seminal vesicle, prostate, bulbo-urethral gland, and penis, from 38 male goats, 7 to 210 days of age were studied for their growth and development. Growth of the testis, epididymis, seminal vesicle, and penis was found to be well correlated with the slaughter weight up to 114 days of age, but with the birth weight only within the period from 90 to 114 days of age. Microscopic observations on the testis, epididymis, ductus deferens, seminal vesicle, prostate, bulbo-urethral gland, and penis were made and sections from these organs at different ages are described. It was found that the growth of the testis could be divided into three stages: from birth to 80 days, growth at a definite and uniform rate; from 80 to 120 days, correlated with birth weight; and from 120 days on, no relation between growth of the testis and birth weight. The development of the urethral process and the growth of the seminiferous tubules also agree with these tliree stages. The growth of the seminiferous tubules is closely correlated with the weight of the testis rather than with the age of the animal. The large primordial germ cells in tlie young animals seemed to be tlie remnants of the embryonic large cells which disappeared by 60 days of age. The division and growth of the epithelial germ cells after birth produces the primary spermatocytes only. Spermatozoa appeared at the age of 92 days in male goats, much earlier than in rams, bulls, and boars. The whole process of spermatogenesis is assumed to be approximately 22 days in tlie goat The epithelial cells in the head of the epi,didymis have cilia but not those in the tail of the epididymis. Mature spermatozoa appeared in the epididymis at an age around 110 to 114 days. The older male goats hare a larger granular region in the epithelial cells of the epididyniis, seminal vesicle, and prostate, than the younger ones. According to the histological changes of the reproductive orgaiis, sexual maturation in male goats may be divided into four stages: young stage, from birth to 80 days of age; developing stage, 80 to 114 days ; growing stage, 114 to 150 days ; and adult or mature stage, 150 days and older. It is suggested that the bucks be separated from does in a flock around the age of 80 days, an'd that a buck at the age of 100 days might be used for artificial insemination. MenosThe testis, epididymis, ductus deferens, seminal vesicle, prostate, bulbo-urethral gland, and penis, from 38 male goats, 7 to 210 days of age were studied for their growth and development. Growth of the testis, epididymis, seminal vesicle, and penis was found to be well correlated with the slaughter weight up to 114 days of age, but with the birth weight only within the period from 90 to 114 days of age. Microscopic observations on the testis, epididymis, ductus deferens, seminal vesicle, prostate, bulbo-urethral gland, and penis were made and sections from these organs at different ages are described. It was found that the growth of the testis could be divided into three stages: from birth to 80 days, growth at a definite and uniform rate; from 80 to 120 days, correlated with birth weight; and from 120 days on, no relation between growth of the testis and birth weight. The development of the urethral process and the growth of the seminiferous tubules also agree with these tliree stages. The growth of the seminiferous tubules is closely correlated with the weight of the testis rather than with the age of the animal. The large primordial germ cells in tlie young animals seemed to be tlie remnants of the embryonic large cells which disappeared by 60 days of age. The division and growth of the epithelial germ cells after birth produces the primary spermatocytes only. Spermatozoa appeared at the age of 92 days in male goats, much earlier than in rams, bulls, and boars. The whole... Mostrar Tudo |
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Palavras-Chave: |
Andrologia; Período pós-natal; Postnatal period. |
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Thesagro: |
Caprino; Histologia; Reprodução. |
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Thesaurus Nal: |
Goats; Reproduction; Spermatozoa; Testes. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 03078naa a2200253 a 4500
001 1522787
005 2023-11-28
008 1954 bl uuuu u00u1 u #d
100 1 $aYAO, T. S.
245 $aPostnatal growth and histological development of reproductive organs in male goats.$h[electronic resource]
260 $c1954
520 $aThe testis, epididymis, ductus deferens, seminal vesicle, prostate, bulbo-urethral gland, and penis, from 38 male goats, 7 to 210 days of age were studied for their growth and development. Growth of the testis, epididymis, seminal vesicle, and penis was found to be well correlated with the slaughter weight up to 114 days of age, but with the birth weight only within the period from 90 to 114 days of age. Microscopic observations on the testis, epididymis, ductus deferens, seminal vesicle, prostate, bulbo-urethral gland, and penis were made and sections from these organs at different ages are described. It was found that the growth of the testis could be divided into three stages: from birth to 80 days, growth at a definite and uniform rate; from 80 to 120 days, correlated with birth weight; and from 120 days on, no relation between growth of the testis and birth weight. The development of the urethral process and the growth of the seminiferous tubules also agree with these tliree stages. The growth of the seminiferous tubules is closely correlated with the weight of the testis rather than with the age of the animal. The large primordial germ cells in tlie young animals seemed to be tlie remnants of the embryonic large cells which disappeared by 60 days of age. The division and growth of the epithelial germ cells after birth produces the primary spermatocytes only. Spermatozoa appeared at the age of 92 days in male goats, much earlier than in rams, bulls, and boars. The whole process of spermatogenesis is assumed to be approximately 22 days in tlie goat The epithelial cells in the head of the epi,didymis have cilia but not those in the tail of the epididymis. Mature spermatozoa appeared in the epididymis at an age around 110 to 114 days. The older male goats hare a larger granular region in the epithelial cells of the epididyniis, seminal vesicle, and prostate, than the younger ones. According to the histological changes of the reproductive orgaiis, sexual maturation in male goats may be divided into four stages: young stage, from birth to 80 days of age; developing stage, 80 to 114 days ; growing stage, 114 to 150 days ; and adult or mature stage, 150 days and older. It is suggested that the bucks be separated from does in a flock around the age of 80 days, an'd that a buck at the age of 100 days might be used for artificial insemination.
650 $aGoats
650 $aReproduction
650 $aSpermatozoa
650 $aTestes
650 $aCaprino
650 $aHistologia
650 $aReprodução
653 $aAndrologia
653 $aPeríodo pós-natal
653 $aPostnatal period
700 1 $aEATON, O. N.
773 $tAmerican Journal of Anatomy$gv. 95, n. 3, p. 401-431, Nov. 1954.
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Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
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