摘要
120只28日龄艾维茵(AVIAN)肉仔鸡随机分为1、2、3、4组.1组为对照组,饮自来水;2、3、4组为试验组,分别饮添加0.18％、0.26％、0.34％氯化钾的自来水.舍温控制在34±1℃.试验期为4周.结果,各组鸡增重、采食量、饲料效率、饮水量的顺序均为第4组→第3组→第2组→第1组.饮水中添加KCI,肉仔鸡血清K^+浓度高于对照组,而直肠温度、呼吸率及血清尿酸浓度则相反.血清Na^+前两周3、4组显著低于1组,以后趋于一致.血细胞压积(PCV)、血液PH、CO_2分压(PCO_2)、氧分压(PO_2)、碳酸氢根(HCO_3)和血清中总蛋白、白蛋白、白/球比以及血糖,组间均差异不显著.本试验表明,饮水中添加KCI能较好地缓解热应激对肉仔鸡生长的影响,增强肉仔鸡对高温的耐受性,并可提高其生产性能.
One hundred and twenty 24-day-old healthy AVIAN broilers were divid-ed randomly into four groups. Group Ⅰ, which was the control drinking tap water andgroups Ⅱ, Ⅲ, Ⅳ drinking tap water supplemented with 0.18%, 0.26%, and 0.34%potassium chloride (KCl), respectively. The experiment lasted 4 weeks. All the broil-ers were raised in the same environmental chamber in which the temperature was main-tained at 34±1℃. The results showed that the weekly body weight gain, feed intake,feed conversion efficiency and water intake among the groups were Ⅳ, Ⅲ,Ⅱ , and Ⅰ inorder. The serum potassium of the broilers in the experimental groups was higher thanthat of group Ⅰ, but their rectal temperature, respiratory rate and serum uric acid werelower. Plasma sodium of the broilers of groups Ⅲ and Ⅳ were lower than that of groupⅠ(P<0.05) at the age of 28-42 days. As fas as blood sugar, packed cell volume(PCV), blood PO_2, blood HCO_3, albumin and total protein as well as A/G of serum,there were no significant differences among all groups. The conclusion of the experi-ment was that adding potassium in the form of KCl to drinking water can alleviate theharmful effect of high environmental temperature on the growth of broilers, enhance thetolerance to high temperature and improve their production.
关键词
仔鸡
热应激
氯化钾
肉用鸡
broiler
heat stress
potassium chloride
