| Two complicated antiheat stress additives were designed to study the effect of two antiheat additives on laying hens blood biochemical index and performance under the heat stress.Three hundred Qingjiao Ma chickens,280 days old, was allocated into three groups according to a completely randomized design. The birds in group III (control group) were fed a basal diet, The birds in group I were fed a basal diet with additives I (include Chinese herb medicine , VitC and VitE), and the birds in group II were fed a basal diet with additives II (include sodium hydrogen carbonate, ammonium chloride, potassium chloride, VitC and VitE). Hens were pre-fed with a commercial diet for 7 days, which then followed a formal experiment with 30 days. The results showed that 1) Comparing with the control group, the level of Ca2+, K+, GLU, TG, TP, ALP in serum in group I increased significantly, and the level of CK, LDH and ALT decreased significantly (P<0.01). Comparing with II, the level of TG, Ca2+, GLU, ALP in serum in group I increased significantly (P <0.05), and the level of ALT, AST decreased significantly (P <0.05) .There was no difference of levels of Na+ , CL- and Carbohydrate in serum among the groups.(2) Comparing with III , the laying rate, egg weight feed/egg ratio and egg shell thickness in group I increased of 9.15%, 3.54%, 9.50%, 7.36% respectively, and the soft eggshell and broken eggshell rate, death rate decreased 19.21% and 58.63% respectively, net income per hen per mouth rose by 9.66%. Comparing with III , laying rate, egg weight, feed/egg ratio, eggshell thickness in group II increased of 5.56% 3.99%, 3.91%, 4.29% respectively, and the eggshell and broken eggshell rate, death rate decreased of 15.69% and 39.21% respectively, net income per hen per mouth rose by 4.90%.(3) The additives I was more effective than additives II for anti-heat stress. Comparing with group II, laying rate, egg weight, feed/egg ratio increased of 3.41%, 25,81% and... |
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