The development of the reproductive organs of the male giraffe, Giraffa camelopardalis | Zendy

A.J. Hall-Martin | Zendy; J. D. Skinner | Zendy; B.J. Hopkins | Zendy

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The development of the reproductive organs of the male giraffe, Giraffa camelopardalis

Author(s) -

A.J. Hall-Martin,

J. D. Skinner,

B.J. Hopkins

Publication year - 1978

Publication title -

reproduction

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.208

H-Index - 136

eISSN - 1741-7899

pISSN - 1470-1626

DOI - 10.1530/jrf.0.0520001

Subject(s) - biology , testosterone (patch) , spermatogenesis , histology , muscle hypertrophy , anatomy , adult male , androstenedione , endocrinology , medicine , andrology , physiology , hormone , androgen , genetics

The reproductive organs of the male giraffe differ little in morphology and histology from those of other ungulates. There is some indication that gonadal hypertrophy occurs in late fetal life. Spermatogenesis begins at 3-4 years of age and coincides with a rapid increase of testicular weight and seminiferous tubule diameter. In the fetal testis the main hormone is androsteredione (2.73 microgram/g) but in adult testes testosterone is predominant (less than 10.08 microgram/g) and delta' testosterone may also be present.

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