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Biology of Reproduction, Vol 20, 198-204, Copyright © 1979 by Society for the Study of Reproduction
1 Institute of Veterinary Anatomy, State University Utrecht,
Bekkerstraatl41, Utrecht, The Netherlands Pig fetuses were decapitated at 42 days postcoitum. At 74, 90, 110 and 113 days postcoitum,
13 decapitated males in total were collected in order to study the effect of deprivation of pituitary
hormones on the development of the testis and of other endocrine organs as well as on testicular
descent. Decapitation did not markedly interfere with fetal growth, but the weights of testes,
adrenals and thyroids were significantly reduced. In the testis Leydig cell development was most
affected. These cells were almost absent and in the few remaining cells hydroxysteroid-dehydrogenases were histochemically undetectable. Increase in weight and length of the seminiferous
tubules was diminished, but the diameter was increased. Germ cell development was quantitatively
undisturbed. Gubernacular development was functionally unaffected, testicular descent occurred
normally. It is concluded that the development of Leydig cells, seminiferous tubules, adrenal and
thyroid depends on pituitary hormones during the second half of fetal life while the process of
testicular descent is independent of these hormones in this period.
Note:
ACKNOWLEDGMENTS
Thanks are due to Dr. W. D. Oxender for his help
and advice.
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