Testis Morphometry, Duration of Spermatogenesis, and Spermatogenic Efficiency in the Wild Boar (Sus scrofa scrofa)1
Open Access
- 1 November 2006
- journal article
- Published by Oxford University Press (OUP) in Biology of Reproduction
- Vol. 75 (5), 792-799
- https://doi.org/10.1095/biolreprod.106.053835
Abstract
The wild boar is a natural inhabitant of Europe, Asia, and North Africa and is phylogenetically the ancestor of the domestic pig. Because of its phylogenetic and economic importance, this species is an interesting model for studying testis function in boars. Therefore, the present study was performed to investigate the testis structure, spermatogenic cycle length, and Sertoli cell (SC) and spermatogenic efficiencies in eight adult wild boars. Each spermatogenic cycle lasted 9.05 days, and the total duration of spermatogenesis was estimated as lasting approximately 41 days. The percentages of testis volume occupied by seminiferous tubules and by Leydig cells were 87% and 6%, respectively. The mean number of SCs per gram of testis was 42 million. The SC (round spermatids per SC) and spermatogenic (daily sperm production per gram of testis) efficiencies were 6.6 cells and 28.6 million, respectively. In general, the testis structure, overall germ cell associations at the different stages of the seminiferous epithelium cycle, and duration of spermatogenesis in the wild boar were similar to those in domestic pigs. Probably because of the small size of Leydig cells (400 μm3), their number per gram of testis (157 million) was the highest among investigated mammalian species. Although the SC efficiency in wild boars was low, their spermatogenic efficiency was comparable to that observed in domestic pigs, mainly because of the higher number of SCs per gram of testis in wild boars. These data suggest that SCs became more efficient during evolution, genetic selection, and domestication in pigs.Keywords
This publication has 35 references indexed in Scilit:
- The Seminiferous Epithelium Cycle Length in the Black Tufted-Ear Marmoset (Callithrix penicillata) Is Similar to Humans1Biology of Reproduction, 2006
- Spermatogenesis and sperm transit through the epididymis in mammals with emphasis on pigsTheriogenology, 2005
- Testis Morphometry, Seminiferous Epithelium Cycle Length, and Daily Sperm Production in Domestic Cats (Felis catus)Biology of Reproduction, 2003
- Germ Cell Genotype Controls Cell Cycle during Spermatogenesis in the Rat1Biology of Reproduction, 1998
- Adult testicular enlargement induced by neonatal hypothyroidism is accompanied by increased Sertoli and germ cell numbers.Endocrinology, 1993
- Morphometric studies on rat seminiferous tubulesJournal of Anatomy, 1982
- A New Approach to Quantification of Spermatogenesis and Its Application to Germinal Cell Attrition During Human Spermiogenesis1Biology of Reproduction, 1981
- Methods for Quantifying Mammalian Spermatogenesis: a Review1Journal of Animal Science, 1977
- Kinetics of spermatogenesis in mammals: seminiferous epithelium cycle and spermatogonial renewal.Physiological Reviews, 1972
- DEFINITION OF THE STAGES OF THE CYCLE OF THE SEMINIFEROUS EPITHELIUM IN THE RATAnnals of the New York Academy of Sciences, 1952