【摘要】 试验选用11日龄北京鸭420只,研究日粮中添加不同水平的钴(0、0.25、0.5、1.0、2.0、4.0mg/kg)对北京鸭生产性能及相关血液生理生化指标的影响。结果表明:日粮中添加钴可显著提高北京鸭的血液红细胞数、红细胞压积(P<0.10),血浆总蛋白、白蛋白及球蛋白含量(P<0.01),红细胞C3b受体花环率(P<0.01)、血浆中维生素B1(2P<0.01)、钴含量(P<0.01)和肝脏钴含量(P<0.01),而且随日粮中钴添加量的增加,红细胞数、红细胞压积,血浆总蛋白、白蛋白、球蛋白含量,血浆维生素B12、钴和肝脏钴含量均呈二次曲线关系(P<0.01),而血浆铁含量线性降低(P<0.01),红细胞C3b受体花环率则线性提高(P<0.01)。因此,北京鸭日粮中钴的适宜添加量为1.8～2.8mg/kg。更多还原

【Abstract】 The experiment was employed with six levels of cobalt(0, 0.25, 0.5, 1.0, 2.0 mg/kg and 4.0 mg/kg) to study the effects of different levels of cobalt on performance and releated biological functions of Beijing ducks.The results showed that there was no significant impact on the performance and carcass quality in different dietary cobalt levels.There was a trend of lowering the mortality and raising the rate of legs and meat color.In contrast to the control, adding 0.5 mg/kg cobalt in diet significantly increased RBC(P < 0.10).PCV was significantly increased with the supplementation of cobalt in 0.25, 0.5, 1.0 mg/kg and 2.0 mg/kg(P < 0.10).The iron content in plasma was significantly decreased with the supplementation of cobalt in 1.0, 2.0 mg/kg and 4.0 mg/kg(P < 0.10).With the dietary cobalt content increasing, RBC and PCV were quadratic(P < 0.10) and the iron content in plasma was linearly decreased(P < 0.10).The TP, ALB, GLB in plasma and the C3b receptor rosette rate were significantly affected in levels of the dietary cobalt(P < 0.10).Adding 0.5 mg/kg cobalt in diet significantly increased the vitamin B12content in plasma(P < 0.10).The cobalt content in plasma and liver were significantly affected in the levels of the dietary cobalt(P < 0.10).更多还原