金霉素对产蛋后期蛋鸡产蛋性能的影响

The effects of chlortetracycline on the elder laying hens:

选 30 0日龄罗曼蛋鸡 384羽 ,随机分为对照和试验两组 ,每组设 4个重复 ,每一重复 4 8羽。饲喂相同的基础饲粮 ,试验组饲粮添加 10 0mg/kg金霉素。试验进行 90天 ,并屠宰测定。结果表明 :饲粮中添加金霉素使产蛋率、蛋壳相对重和蛋壳厚度分别提高了 4 .4 0 % (P <0 .0 5)、7 51% (P<0 .0 5)和 10 .17(P <0 .0 5) ,料蛋比降低了 3.73% (P <0 .0 5)。但对采食量和其它蛋品质指标无明显影响。腹脂率和肝脂率呈降低趋势 (P <0 .0 5) ,腹脂中激素敏感脂酶活性呈增高趋势 (P <0 0 5)。另外 ,还显著增高了血清碱性磷酸酶活性 17 6% (P <0 .0 5)和甲状旁腺素水平 2 6.33% (P<0 .0 5) ,甘油三脂含量减少了 16.57% (P <0 .0 5)。上述结果提示 ,金霉素通过提高与产蛋相关的各种酶活和激素水平 。

ROM laying hens of 300 days of age were randomly divided into two groups,each included four replicates of 48 layers.The layers were given a basal cornsoybean meal diet alone or supplemented with 100 mg/kg chlortetracycline for a period of 90 days.Results indicated that adding chlortetracycline groups obviously increased daily mean laying rate ( P <0.05),eggshell thickness( P <0.05),relative eggshell weight( P <0.05) and decreased feed/egg ratio( P <0.05).But there were no significant effects on feed intake,egg weight,egg specific gravity,yolk index,egg shape index and Haugh score( P <0.05) respectively compared with the control group.There was a trend that chlortetracycline reduced the weight of fat in liver and abdomen( P <0.05),promoted the activity of hormone sensibility lipase (HSL) in abdominal fat( P <0.05).Futhermore,the activity of alkaline phosphatase (AKP) and contents of parathormone and TG 3 in serum were enhanced by 17.6%( P <0 05),26.33%( P <0.05) and 16.57%( P <0.05),respectively.This showed that chlortetracycline improved the laying performance and egg quality through affecting enzymes and hormone in hens.