【摘要】 本文旨在研究玉米-豆粕型日粮含不同氯水平对生长蛋鸭生产性能和体内酸碱平衡的影响,并就氯的作用机制进行探讨。试验采用单因素随机区组设计的方法,选用28日龄平均体重为(0.50±0.04)kg的蛋鸭300只,随机分为5个处理组:日粮中,第Ⅰ组含氯0.06%,第Ⅱ组含氯0.12%,第Ⅲ组含氯0.18%,第Ⅳ组含氯0.30%,第Ⅴ组含氯0.60%。每个处理组设10个重复,每个重复6只蛋鸭。结果表明,饲粮中含氯0.06%会显著降低蛋鸭的生产性能(P<0.05);氯水平为0.12%~0.60%时对蛋鸭的生产性能无显著影响(P>0.05),但是0.12%氯水平组的日增重、终重、饲料转化率等各项指标都优于0.18%~0.60%氯水平组。各处理组之间血清中Cl-含量,血液阴离子间隙(AG)差异显著(P<0.05),血清Na+含量差异极显著(P<0.01),并且随着氯含量的升高而呈线性增加。0.06%~0.60%氯水平组间血液pH和HCO3-浓度差异不显著(P>0.05),但是随氯水平增大而降低,有代谢性酸中毒的趋势发生。各处理组间的尿素氮、肌酐、尿酸差异不显著(P>0.05)。当饲粮中含钠0.15%时,0.12%的氯水平可使生长蛋鸭发挥最佳的生产性能,低水平(0.06%)或高水平的氯(0.30%~0.60%)会消耗体内的代谢过程用于调节酸碱平衡,从而降低了自身的生产性能。随饲粮中氯水平的增加(0.06%~0.60%),血液有逐渐变酸的趋势,但是不会对肾调节酸碱平衡的能力构成威胁。更多还原

【Abstract】 The experiment was conducted to study the effects of chlorine on performance and body acid-base balance in growing ducks and discussed the possible mechanism of chlorine.Three hundred Jin-Ding ducks,with an average weight of(0.50±0.40) kg,were used and randomly allotted into five treatments with ten replications of six ducks.The five treatments diets were group Ⅰ contained chlorine 0.06%,group Ⅱ contained chlorine 0.12%,group Ⅲ contained chlorine 0.18%,group Ⅳ contained chlorine 0.30%,and group Ⅴ contained 0.60% chlorine,respectively.The result showed that performance was significantly reduced for ducks fed diets containing chlorine 0.06%(P<0.05).There was no significant effect on performance among the groups of 0.12%～0.60% chlorine(P>0.05),but ADG,FW and FCR,ducks fed diet containing 0.12% chlorine,were better than other groups.The differences of serum Cl-and AG(anion gap) between treatments were significant(P<0.05) and serum Na+ were significant(P<0.01),and the indices increased significantly as the level of chlorine increased(P<0.05).Blood pH and plasma HCO3-were not significantly decreased with chlorine level increased(P>0.05).It is concluded that duck will make the optimal performance when the diet contained 0.12% chlorine,low level(0.06%) or high level chlorine(0.30%～0.60%) would consume metabolism for regulating acid-base balance and reduce performance.With the increase of chlorine level(0.06%～0.60%),it would increase acidity of blood,but it would not significantly influence the role that kidney regulated acid-base balance.更多还原