Seasonal changes in testicular cell morphology in domestic male cats (Felis catus).

The aim of this study was to asses the variation in the morphology of the seminal epithelium in relation to natural photoperiod in male cats. Tom cats (n = 240) were castrated every other week throughout the year. Each testis was fixed in Bouin's solution and cut into sections. The percentage of tubules with round spermatids (RS), elongated spermatids (ES), tailed spermatids (TS), mature spermatids (MS) and the number of Sertoli cells (SC) and Leydig cells (LC) were recorded in each sample. Testicles from males during short days (SHD) had a higher percentage of tubules with RS and ES compared to testicles from males during long days (LHD, 31.3 +/- 0.6 vs 2.1 +/- 0.6%, p < 0.001; 30.9 +/- 0.7 vs 11.0 +/- 0.7%, p < 0.001). Conversely, testicles from males during SHD had a lower percentage of tubules with TS and MS compared to testicles from males during LHD (24.5 +/- 0.8 vs 29.7 +/- 0.8%, p < 0.01; 13.1 +/- 1.2 vs 57.0 +/- 1.2%, p < 0.01). Furthermore, testicles from males during SHD had a higher number of SC and lower number of LC compared to testicles from males during LHD (11.4 +/- 0.1 vs 8.0 +/- 0.1%, p < 0.01; 19.2 +/- 1.0 vs 38.0 +/- 1.0%, p < 0.01). In conclusion, there are seasonal changes in testis cell morphology in the tom which may be related to seasonal sperm production.

[1]  K. Jewgenow,et al.  Moderate seasonality in testis function of domestic cat. , 2007, Reproduction in domestic animals = Zuchthygiene.

[2]  E. Axnér,et al.  Sperm morphology in the domestic cat, and its relation with fertility: a retrospective study. , 2007, Reproduction in domestic animals = Zuchthygiene.

[3]  Bruno Claustrat,et al.  The basic physiology and pathophysiology of melatonin. , 2005, Sleep medicine reviews.

[4]  L. R. França,et al.  Testis Morphometry, Seminiferous Epithelium Cycle Length, and Daily Sperm Production in Domestic Cats (Felis catus) , 2003, Biology of reproduction.

[5]  M. Migaud,et al.  Neuroendocrine interactions and seasonality. , 2002, Domestic animal endocrinology.

[6]  W. Farstad.  Assisted reproductive technology in canid species. , 2000, Theriogenology.

[7]  D. Wildt,et al.  Circannual variations in intraovarian oocyte but not epididymal sperm quality in the domestic Cat. , 1999, Biology of reproduction.

[8]  J. A. Delgadillo,et al.  Emploi des implants de mélatonine et des traitements photopériodiques pour maîtriser la reproduction saisonnière chez les ovins et les caprins , 1996 .

[9]  G. Stabenfeldt,et al.  Effect of melatonin on photoperiod responses, ovarian secretion of oestrogen, and coital responses in the domestic cat. , 1989, Journal of reproduction and fertility. Supplement.

[10]  G. Stabenfeldt,et al.  The effect of different photoperiods on plasma concentrations of melatonin, prolactin, and cortisol in the domestic cat. , 1984, Endocrinology.