外源性环核苷酸对AA肉鸡生长发育的作用

Effects of Exogenous Cycle Nucleotides on the Growth of Broilers

选用初生健康ＡＡ肉鸡１００只，随机分为２组，每组各５０只，每组内设３个重复。Ⅰ组为试验组，每隔４ｄ皮下注射环核苷酸０．１ｍＬ／只（ｃＡＭＰ∶ｃＧＭＰ为１∶２）；Ⅱ组为对照组，注射等量生理盐水。试验期４９ｄ。研究结果表明：试验组鸡７周末体重、饲料利用率、成活率分别比对照组鸡提高１１．５６％、７．９５％、１９．１５％。公、母鸡的半净膛屠宰率、全净膛屠宰率、胸肌率、腿肌率试验组比对照组分别提高了２．６３％、２．５１％、１３．５５％、６．７２％和１．４９％、２．６１％、１７．５５％、１８．２３％；腹脂率、皮脂厚和肌间脂厚分别降低了１９．４４％、１１．５４％、１８．６８％和１９．１６％、８．５７％、２０．６８％。血清生长激素水平升高６１．２０％，球蛋白含量提高３４．０９％，胰岛素水平降低３４．８０％，甘油三脂浓度提高５３．６１％。

One hundred AA broiler chickens were divided randomly into two equal groups, experimental group(Ⅰ) and control group(Ⅱ). The chickens in group I were injected subcutaneously with 0.1 mL of exogenous cycle nuleotides (cAMP∶cGMP=1∶2) every 4 days and those in group Ⅱ with physiological saline as control during the 49 days of experimental period. The results showed that the body weight, feed conversion ratio and survival rate in the experimental group increased by 11.55%, 7.95% and 19.15% respectively as compared with the control group; the total dressing percentage, partial dressing percentage and brisket percentage increased by 2.63%, 2.51%,13.55%(P< 0.01) in cocks and 1.49% , 2.61%, 17.75%(P<0.01) in hens, respectively; the fat content of abdomen, skin, intermuscle decreased by 19.44%, 11.54%(P<0.01), 18.68%(P<0.01) in cocks and 19.16%(P<0.01), 8.57%(P< 0.05), 20.68%(P<0.01) in hens; the concentrations of GH and globulin in the serum increased by 61.20% and 34 09% respectively; the level of insulin decreased by 34.80%(P<0.05);the concentration of triglyceride increased by 53.61%(P<0.01).