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Your search keyword '"Perreau, C."' showing total 6 results
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6 results on '"Perreau, C."'

4. Effect of season of birth and of hemicastration on the histology of the testis of 6-month-old lambs

Author

Hochereau-de Reviers Mt, Land Rb, Perreau C, and Robin Thompson

Subjects
Male, endocrine system, Embryology, medicine.medical_specialty, Season of birth, Cell Count, Biology, Andrology, Endocrinology, Internal medicine, Testis, medicine, Animals, Castration, Spermatogenesis, Sertoli Cells, Sheep, Cellular composition, Spermatid, urogenital system, Leydig Cells, Obstetrics and Gynecology, Histology, Organ Size, Cell Biology, Sertoli cell, medicine.anatomical_structure, Reproductive Medicine, Testicular histology, Seasons
Abstract

Summary. Season but not hemicastration affected the cellular composition of the testis. Despite similar weight, the testicular histology differed markedly with season of birth. The number of Leydig cells and of Sertoli cells was greater in summer- than in winter\x=req-\ born lambs by factors of 2 and 1 \m=.\5respectively. Similarly the number of spermatogonia and their rate of production increased substantially in summer-born lambs. The rate of spermatid production was affected by both hemicastration and season. Season of birth exerted more modifications to testicular histology than did hemicastration.

Published
1984

5. Photoperiodic variations of somatic and germ cell populations in the Soay ram testis

Author

Reviers, M. T. Hochereau-de, Perreau, C., and Lincoln, G. A.

Abstract

Summary.Seasonal changes in the Leydig, Sertoli and stem cells (undifferentiated A0and cyclic A1) spermatogonia and the daily spermatid production were analysed in the testes of adult Soay rams exposed to short days (8L: 16D) or long days (16L: 8D) for 12 weeks. The total numbers of Leydig, Sertoli and stem cells (A0+ A1) were not affected by the treatments, but the size of the Leydig and the Sertoli cells, the efficiency of spermatogenesis (i.e. the number of male gametes produced by an A1spermatogonium and the daily sperm production were all significantly reduced in the rams exposed to long days. There was a positive correlation between the concentration of FSH and testosterone and many of the cytological changes consistent with a causal role for these hormones in mediating the effects of photoperiod on the testicular function in the ram.

Published
1985
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