不同能量水平限饲对肉种鸡血液生化及内分泌指标的影响

文章探讨不同能量水平日粮对肉种鸡血液生化及内分泌指标影响。试验选用健康、体重基本一致的27W爱拔益加肉种鸡240羽,随机分为4个处理组,分别为饲喂基础日粮对照组,能量水平为基础日粮50%(Ⅰ组)、70%(Ⅱ组)、80%(Ⅲ组)试验组,每组设置6个重复,每个重复10羽。对照组与限饲组饲喂量相同且限饲,于40W结束试验。结果表明,(1)血清生化,与对照组相比,肉种鸡饲粮Ⅰ、Ⅱ能量限饲组血清中甘油三酯(TG)含量显著升高(P0.05),且Ⅰ组显著高于Ⅱ组(P0.05);各能量限饲组血清中高密度脂蛋白(HDL)、低密度脂蛋白(LDL)含量显著降低(P0.05),且Ⅰ组低密度脂蛋白含量低于Ⅱ、Ⅲ组;各能量限饲组葡萄糖(GLU)含量显著升高(P0.05)。Ⅰ组血清中总蛋白(TP)含量显著降低(P0.05);各能量限饲组血清中白蛋白(ALB)含量显著降低(P0.05),且Ⅰ组显著低于Ⅱ、Ⅲ组(P0.05)。(2)内分泌指标,与对照组相比,各能量限饲组血清中三碘甲腺原氨酸(T3)含量显著升高(P0.05),且Ⅰ组显著低于Ⅱ、Ⅲ组(P0.05);Ⅱ、Ⅲ组血清中甲状腺素(T4)含量显著升高(P0.05)。Ⅰ、Ⅱ组血清中生长激素(GH)含量显著升高(P0.05);各能量饲组血清中胰岛素(Ins)、胰岛素样生长因子(IGF-Ⅰ)含量显著升高(P0.05),且Ⅲ组胰岛素样生长因子含量高于其他各组(P0.05)。Ⅱ、Ⅲ组血清中瘦素(Lep)含量显著升高(P0.05),且Ⅲ组高于Ⅱ组(P0.05)。各能量限饲组血清中雌二醇(E2)含量显著升高(P0.05),且Ⅰ组高于Ⅱ、Ⅲ组(P0.05)。综上所述,肉种鸡能量限饲可降低血清中各蛋白含量,葡萄糖(GLU)显著增加,内分泌中激素指标升高,80%能量水平饲喂较为适宜。

Effect of different levels of dietary energy restriction on blood biochemical parameters and endocrine indexes in broiler breeders

This experiment was conducted to study the effect of different levels of dietary energy restriction on blood biochemical parameters and endocrine indexes in Arbor Acres (AA) broiler breeders.A total of 240 Arbor Acres (AA) broiler breeders (27 weeks of age),which were healthy,and roughly the same age and similar body weight,were selected and randomly divided into four groups with six replicates,10 broiler breeders per replicate.The dietary energy levels included the control group with the basal diet and the daily energy levels of 80％ (Ⅲ),70％(Ⅱ) and 50％ (Ⅰ) of the control group.Dudng the experimental period,all the groups were fed the same amount,but energy restriction every day.The experiment ended at 40 weeks old of broiler breeders,and the blood biochemical parameters and endocrine indexes of broiler breeders were determined.① The results of blood biochemical parameters showed that the contents of triglyceride in groups Ⅰ and Ⅱ in serum of broiler breeders were significantly higher than those of the control group (P＜0.05),and the content in group Ⅰwas significantly higher than that in group Ⅱ;high density iipoprotein and low density lipoproteinin in serum of each energy restriction group were reduced significantly (P＜0.05),and the content in group Ⅰ was significantly lower than that in groups Ⅱ and Ⅲ (P＜0.05);glucosecontents in serum of each energy restriction group were significantly increased (P＜0.05).The contents of the total protein in group l in serum were reduced significantly (P＜0.05).Albumin contents in serum of each energy restriction group were reduced significantly (P＜0.05),and the content in group Ⅰ was significantly lower than that in groups Ⅱ and Ⅲ (P＜0.05).② The results of endocrine indexes showed that the contents of three iodine thyroid original acid in serum of each energy restriction group were significantly increased (P＜0.05),and the content in group Ⅰ was significantly lower than that in groups Ⅱ and Ⅲ (P＜0.05);the contents of thyroxine in groups Ⅱ and Ⅲ were significantly increased (P＜0.05).The growth hormone levels in groups Ⅰ and Ⅱ were significantly increased (P＜0.05).The contents of insulin and insulin-like growth factor in serum of each energy restriction group were significantly increased (P＜0.05),and the content of insulin-like growth factor in group Ⅲ was significantly higher than that in other groups (P＜0.05).The contents of Leptin in groups Ⅱ and Ⅲ were significantly increased (P＜0.05),and the content in group Ⅲ was significantly higher than that in group Ⅱ (P＜0.05).Estradiol in serum of each energy restriction was significantly increased (P＜0.05),and the content in group lwas significantly higher than that in groups Ⅱ and Ⅲ (P＜0.05).In summary,dietary energy restriction of broiler breeders could decrease the contents of proteins,increase the contents of glucose and endocrine hormone indexes,and the 80％ energy group was best suited.