Testes size often predicts the winner during episodes of sperm competition. However, little is known about the source of nutrients allocated to testes development, or testes plasticity under varying nutrient availability. Among many holometabolous insects, metabolic resources can derive from the larval or adult diet. Distinguishing the source of nutrients allocated to testes can shed light on l...

Swerdlow et al studied a cohort of 1075 men who had been treated for cryptorchidism. In 120 testes that had been biopsied at the time of orchiopexy the relative risk of subsequent development of testicular cancer was 66.7. The corresponding relative risk in 1285 undescended testes that had also been operated on but not biopsied was 6.7. The estimate for testes that were not biopsied is about as...

There is strong evidence that polyandrous taxa have evolved relatively larger testes than monogamous relatives. Sperm size may either increase or decrease across species with the risk or intensity of sperm competition. Scorpions represent an ancient direct mode with spermatophore-mediated sperm transfer and are particularly well suited for studies in sperm competition. This work aims to analyze...

Aim: To demonstrate the superiority of laparoscopic undescended testicular surgery for non-palpable testicles in children diagnosis and treatment.Methods: The files patients between age 6 months 18 years who underwent testis investigation due to our clinic, January 2010 September 2021, were reviewed retrospectively. Patients with palpable disorders sex development examination performed under ge...

Take a look around at your fellow Canadians, because they are slowly disappearing. All of the scenarios projected by Statistics Canada about population growth in Canada over the next 50 years show a “negative increase” (you’ve got to love bureaucratic language) in the number of births minus deaths.1 In the low-growth scenario for the Canadian population, the first year in which there will be mo...