【摘要】 试验采用钴(0、2.5mg/kg)×维生素B1(20.025、0.05mg/kg)双因子试验设计,通过2次试验研究钴和维生素B12对北京鸭生产性能及生理生化指标的影响。结果表明:日粮添加钴显著改善北京鸭造血机能和体液免疫以及红细胞免疫功能(P<0.01),显著降低死亡率(P<0.01),对其他生产性能和胴体指标没有显著影响;高维生素B12日粮显著降低日采食量(P<0.10),显著提高胸肌率(P<0.10),但对造血机能没有显著影响。日粮添加钴显著提高血浆维生素B12含量(P<0.10),但钴与维生素B12之间无互作效应。本试验结果说明在北京鸭日粮中维生素B12含量满足需要的情况下,添加钴盐仍有重要意义。更多还原

【Abstract】 The experiment was conducted to study the effects of different levels of cobalt and vitamin B12 on performance, carcass quality and the physiological and biochemical indicators in Beijing ducks. A 2 ×2 factorial arrangement was employed with two levels of cobalt (0 and 2.5 mg/kg) and two levels of vitamin B12 (0.025 mg/kg and 0.050 mg/kg). The results showed that the high cobalt diet significantly decreased the mortality (P < 0.10). There were no significant differences of the average daily feed intake, body weight, feed conversion ratio and the rates of breast and legs of the duck between diatery cobalt levels and vitamin B12 levels. Adding high cobalt in diet significantly increased the red blood cell (RBC)、hemoglobin (Hb) and packed cell volume (PCV) ( P < 0.10), and significantly decreased the iron content in plasma(P < 0.10). The total protein (TP), albumin (ALB), globulin (GLB) in plasma and the C3b receptor rosette rate were significantly affected by the dietary cobalt levels(P < 0.10). Adding high cobalt in diet significantly increased the content of vitamin B12 in plasma (P < 0.10), and adding high vitamin B12 in diet also significantly increased the content of vitamin B12 in plasma(P < 0.10). There was no interaction between the dietary cobalt levels and vitamin B12 levels.更多还原