高钴负荷对肉仔鸡血液粘度的影响及其与肉鸡腹水综合征发生发展的关系

300只AA肉仔鸡平均分成两组，一组为对照组，另一组为高钴负荷组（从5日龄起饮含钴80mg／L的水）。于5，30和45日龄每组随机抽取20只鸡，分别检测红细胞压积（PCV）、红细胞计数（RBC）、血红蛋白浓度（HB）、全血比粘度（BRV）和腹水心脏指数（AHI）；45日龄时扑杀所有试验鸡，观察腹水综合征发生情况。结果为：（1）高钴负荷鸡在30和45日龄时其PCV，RBC和HB显著高于对照鸡（P＜0．05）；（2）30和45日龄时高钴负荷鸡的BRV极显著高于对照鸡（P＜0．01）；（3）30和45日龄时高钴负荷鸡的AHI显著大于对照鸡（P＜0．05），45日龄时高钴负荷鸡的腹水检出率倍增于对照鸡。本试验表明高钴负荷可诱发肉仔鸡红细胞增生，进而使血液粘度升高，最终导致右心肥大－腹水综合征。

The Effects of Higher Cobalt Intake on Blood Viscosity and the Incidence of Ascites Syndrome in Broiler Chickens

This paper deals with the effects of high cobalt intake on blood viscosity and incidence of ascites syndrome in broiler chickens. 80mg/L cobalt was added to drinking water for one group of chicken, compared with the normal level group. The results showed that high cobalt intake can significantly increased red blood cell count, packed cell volume and haemoglobin contents (P<0.05). Chickens with high cobalt intake showed a most significantly raised blood.ratio viscosity (P<0.01) and a significantly higher incidence of right ventricular hypertrophy and ascites. This study indicates that high cobalt intake could induce polycythaemia, blood hyperviscosity and ascites syndrome in broi1er chickens.