The effect of gonadotrophins on fluid secretion and sperm production by the rat and hamster testis.

The study investigates the impact of gonadotrophins such as ovine luteinizing hormone and follicle-stimulating hormone on the fluid secretion, sperm production and secretion in rats and hamsters. The research observes that the use of these hormones doesn’t significantly affect fluid secretion in testes, while the combined use of human chorionic gonadotrophin and pregnant mare serum gonadotrophin results in reduced sperm production.

Overview of Experiments and Findings

• The study involved the administration of ovine luteinizing hormone (LH) in adult hamsters and rats. This was done in an attempt to understand the effects this particular gonadotrophin might have on fluid secretion and the production of sperm in the testes.
• It was observed that the injection of LH had no discernible impact on either fluid secretion (measured through weight gain or water content) or sperm release. The release of sperm was measured by evaluating the total number of sperm in the treated and untreated (ligated and unligated) testes.

Gonadotrophins and Their Effects

• When adult rats were treated for 9 weeks with human chorionic gonadotrophin and pregnant mare serum gonadotrophin, there was a decrease in sperm production, particularly when both hormones were administered together. This was gauged using the same methodology as above, during a 20-hour period after the tying off (ligation) of the efferent ducts.
• The treatments, irrespective of how long they were administered for, displayed no effect on the weight of the testicles, nor on the secretion of fluid. However, when the two hormones were given together for nine weeks, there was a noticeable decrease in the concentration of sperm in collected rete testis fluid.

Effects of Ovine Follicle-Stimulating Hormone and Ovine Luteinizing Hormone

• The experiment also included the injection of ovine follicle-stimulating hormone (FSH) and ovine luteinizing hormone (LH) in 21-day-old rats. These hormones’ effects were mixed; FSH sparked a slight increase in fluid secretion, while LH caused a slight decrease in the same.
• Ovine prolactin and growth hormone did not show any notable effect on fluid secretion by the testis in these rats.

Ultimately, the study suggests that individual gonadotrophins and their interactions could significantly affect sperm production and fluid secretion, though more research is needed to fully understand these processes and hormones.