Histomorphologic changes of the lymphatic system of the liver and thoracic duct were examined. e diameters of lymphatic segments isolated from the thoracic ducts of ascitic and normal broilers at 32 to 37 days of age were measured using an optical micrometer measurement system. e histopathological picture of the segments of lymphatic tissue showed lymphatic cysts bilaterally along the posterior vena cava. e hepatic capsule manifested edema, thickening, and cellular proliferation. Microscopic changes in lymphatic vessels of the hepatic capsule include lymph embolism, and lymphatic plasma retention in lymphatic cysts. In some cases, distended lymphatic vessels exhibited protuberances, and lymph leaked from the lymphatic cysts into the surrounding swollen and degenerated endothelial cells of the thoracic duct. Sometimes, extensive endothelial cell loss was observed, and their exfoliated fragments were also seen. Marked dilatation of thoracic duct and lymph embolism, leaking of lymph, edema in some fibers and the enlargement of spaces between fibers, swollen intimas, and rupture and bleeding of the thoracic duct were also visible. e thoracic duct's long and short semi-axis, and the cross sectional area of the thoracic duct differed significantly between normal and ascitic broilers.

利用高能日粮常规饲养大群艾维因肉鸡的方法，获得自然肺动脉高压综合征（PHS）肉鸡病例。应用放射免疫分析方法，分别测定了2～6周龄正常组和肺动脉高压（PH）组肉鸡血浆及心、肝、肺、肾等组织中内皮素（endothelin-l，ET-1）的含量，并测定了腹水心脏指数（AHI）和平均肺动脉压（mPAP），同时还应用硝酸还原酶法测定了血浆中一氧化氮（N0）、一氧化氮合酶（NOS）水平。结果显示：PH组AHI、mPAP极显著高于正常组（P<O.01）；从3周龄开始，PH组ET-1水平开始显著或极显著高于正常组（P<0.05或P<0.01），6周龄时PH组血浆、肺脏和肾脏ET-2水平略为下降，但仍极显著高于正常组（P<O.01）；AHI、mPAP和ET-1均随肉鸡日龄的增长而升高；组织中ET-1含量高于血浆，肺组织中ET-1含量明显高于其它几种组织；mPAP变化与血浆ET-1含量变化之间存在显著正相关（P<0.05），但与N0相关性不显著；两组血浆NO、NOS水平均随日龄增长而升高，且PH组NO、NOS水平在后期显著高于正常组。本试验结果提示，ET-1、NO参与了肉鸡PH s的形成和发展过程，并在其中起着重要作用。

以高效液相色谱（HPLC）法建立了猪、羊、鸡肝组织中西维因残留量的检测方法。采用ODS色谱柱，二极管阵列检测器，甲醇/水（66/35）为流动相，222nm检测波长下进行检测。西维因对照品溶液的最低栓测限为0.1mg/L，线性范围为0-1～20mg/L，标准曲线回归方程为：v=-22.459+454.684.31x，线性关系盘好（r=0.9999）。样品以乙腈提取，并加八无水硫酸钠和正已烷．过滤后去除杂质，乙腈层在45～50℃下水浴氯气吹干，残渣用甲醇溶解后，进样分析。平均回收率均大于80%，日间和日内变异系数均小于10%。符各药物残留痕量分析要求。本方法简使，并有很好的选择性、重现性和是敏度。

本文观察了1只38岁高龄的大熊猫多器官衰竭的病理学变化。病理剖检显示，该熊猫主要表现为实质器官充血、水肿和出血性变化；组织病理学检查发现，全身实质器官（除心、肺、脑外）均发生明显萎缩，胃、肠、肝、胰、肾等发生水肿变性或出血；此外，还观察到心肌纤维坏死后的瘢痕形成。结果表明，老龄大熊猫的多器官衰竭的病理学变化与其他动物相似；高龄大熊猫也易患心血管系统疾病，且具有较强的组织修复能力。