Читать книгу Bovine Reproduction - Группа авторов - Страница 73

Testicular blood flow and O₂ uptake were measured in eight Angus bulls to determine the relative importance of blood flow versus metabolism as sources of testicular heat [17]. Blood flow in the testicular artery averaged 12.4 ml/min. Arterial blood was warmer (39.2 vs 36.9 °C, P < 0.001) and had more hemoglobin saturated with O₂ than blood in the testicular vein (95.3 vs 42.0%, P < 0.001). Based on blood flow and hemoglobin saturation, the O₂ used by one testis (1.2 ml/min) was calculated to produce 5.8 cal of heat per minute, compared to 28.3 cal/min attributed to blood flow. Therefore blood flow is the major source of testicular heat.