肉鸡腹水症发病机理研究Ⅳ.肉鸡和蛋仔鸡左右心室功能的比较研究

试验选用快速生长的艾维茵肉鸡和海兰蛋仔鸡 ,各试验组用右心导管法和左心导管法测定肺动脉压(PAP)、右心室收缩压 (RVSP)、左心室收缩压 (LVSP)、左右心室内压最大变化速率 (+dp/dt)的动态变化。并且比较了相同体重健康蛋仔鸡、肉鸡的左右心室功能变化特点。结果表明 :相同日龄肉鸡肺动脉压显著高于蛋仔鸡 ;2 8、35日龄肉鸡右心收缩压显著高于蛋仔鸡 (P <0 0 5) ,2 8、35、42和 49日龄肉鸡左心室收缩压低于蛋仔鸡 ,且差异极显著 (P <0 0 1 )。肉鸡左心室内压最大变化速率 (LV +dp/dt)从 2 1日龄测定起呈现显著性低于同日龄的蛋仔鸡。相同体重的肉鸡和蛋鸡相比 ,肉鸡肺动脉压 (PAP)显著高于蛋仔鸡 ,但肉鸡右心室内压最大变化速率 (RV +dp/dt)、左心室收缩压 (LVSP)、左心室内压最大变化速率 (LV +dp/dt)显著低于蛋仔鸡。这提示肉鸡先天存在着肺动脉压较高、左心室病理性功能低下 ,这可能是肉鸡容易发生腹水症的原因之一

Mechanism of Ascites in Broiler:The Comparative Study of Ventricular Function Between Broilers and Egg-chickens

In the present study,the difference of ventricular function between egg chickens and broilers was investigated by right and left ventricular catheters.The homodynamic parameter such as pulmonary artery pressure(PAP),right ventricular systolic pressure (RVSP) and the maximum rate of right ventricular pressure(RV+dp/dt) were measured every week through the armpit vein.The results were as follows:(1)The PAP of fast growing broilers increased significantly as compared with the egg chickens on the same day.(2)The right ventricular systolic pressure(RVSP) is higher than that of egg chickens from day 28 to day 35,but the broilers left ventricular systolic pressure(LVSP) is lower that of egg chickens,the maximum rate of left ventricular pressure(LV+dp/dt)became low as compared to egg chickens.(3)As for avian ventricular function of same body weight birds,the broiler's PAP was higher than that of egg chickens,but the RV+dp/dt,LVSP and LV+dp/dt were lower than those of egg chickens.It implies apparently that the normal fast growing broilers maintained inborn high PAP,congenital deficiency of left ventricular function.It may be the one cause that easily induces the broilers ascites.