非传染性疾病的发生是受遗传、营养、环境、年龄和性别等因素影响的,其中许多疾病常随动物的年龄增长而出现。一、肝脏小鼠与年龄有关的损害在肝脏是常见的。6月龄时可见肝细胞和核的多形性,包括双核和多核细胞。轻度的灶性坏死有时伴发炎症,有时不伴发炎症,而轻度的灶性肝炎与一种特异的传染性疾病的联系难以证实。其他老年性肝损害有:伴有不同程度门静脉肝炎的胆增生;肝细胞空泡形成;淀粉样物质沉积特别是在门脉周区;肝炎绞窄或成疝;含铁血黄素沉积;脂褐质沉积以及肝 The incidence of noncommunicable diseases is affected by factors such as genetic, nutritional, environmental, age and gender, and many of these diseases often occur as animals age. First, liver age-related damage in the liver is common. Liver cells and nuclear pleomorphism are seen at 6 months of age, including binucleated and multinucleated cells. Mild focal necrosis is sometimes accompanied by inflammation, and sometimes not accompanied by inflammation, and mild focal inflammation and a specific infectious diseases can not be confirmed. Other senile liver damage are: gallbladder hyperplasia accompanied by portal vein hepatitis with varying degrees; vacuolization of hepatocytes; deposition of amyloid deposits, especially in the periventricular area; strangulation of hepatitis or hernia; deposition of hemosiderin; Sediment and liver