蛋鸡对饲粮中蛋氨酸锌的耐受性研究

发布时间：2019-04-19 14:31

【摘要】：本试验旨在研究饲粮中添加高剂量蛋氨酸锌对蛋鸡生产性能、血液学指标和组织病理学的影响,以确定蛋鸡对饲用蛋氨酸锌的耐受剂量。试验采用单因子完全随机设计,选择健康且体重和产蛋率相近的20周龄海兰白蛋鸡540只,随机分成6个组,每个组6个重复,每个重复15只鸡。各组分别饲喂蛋氨酸锌添加水平为0(对照)、70(有效剂量)、140(2倍有效剂量)、350(5倍有效剂量)、700(10倍有效剂量)和1 400 mg/kg(20倍有效剂量)的试验饲粮。试验为期8周。结果显示:1)与对照组相比,70 mg/kg组、140 mg/kg组日产蛋重和产蛋率显著提高(P0.05),料蛋比显著降低(P0.05);350 mg/kg组、700 mg/kg组上述指标与对照组差异不显著(P0.05);与0~700 mg/kg组相比,1 400 mg/kg组日产蛋重和产蛋率极显著降低(P0.01),料蛋比极显著提高(P0.01)。2)饲粮中添加蛋氨酸锌对蛋鸡血液常规指标无显著影响(P0.05)。3)与对照组相比,饲粮中添加70~700 mg/kg蛋氨酸锌对蛋鸡血清生化指标无显著影响(P0.05),但添加1 400 mg/kg蛋氨酸锌极显著提高了血清葡萄糖、尿酸、肌酐、总胆红素含量以及谷草转氨酶、碱性磷酸酶活性(P0.01)。4)添加20倍推荐有效剂量(1 400 mg/kg)的蛋氨酸锌会引起主要器官组织的损伤和病变。结果提示,蛋鸡饲粮中蛋氨酸锌的耐受剂量为700mg/kg。
[Abstract]:The purpose of this experiment was to study the effects of high-dose zinc methionine on the performance, hematological indexes and histopathology of laying hens, so as to determine the tolerance dose of zinc methionine to laying hens. 540 healthy 20-week-old Hailan laying hens with similar weight and laying rate were randomly divided into 6 groups with 6 repeats in each group and 15 chickens in each group. The levels of zinc methionine supplementation in each group were 0 (control), 70 (effective dose), 140 (2 times effective dose), 350 (5 times effective dose), respectively. A trial diet of 700 (10 times effective dose) and 1 400 mg/kg (20 times effective dose) was used. The experiment lasted eight weeks. The results showed that: 1) compared with the control group, the daily egg weight and laying rate of 70 mg/kg group and 140 mg/kg group increased significantly (P0.05), and the feed to egg ratio decreased significantly (P0.05). There was no significant difference in the above indexes between 350 mg/kg group and 700 mg/kg group compared with the control group (P0.05). The daily egg weight and laying rate in 1 400 mg/kg group were significantly lower than those in 0? 700 mg/kg group (P0.01). The feed / egg ratio was significantly increased (P0.01). 2) the dietary zinc methionine had no significant effect on the blood routine indexes of laying hens (P0.05). 3) compared with the control group, there was no significant difference between the control group and the control group (P0.05). The serum biochemical indexes of laying hens were not significantly affected by the addition of 70 mg/kg zinc methionine (P0.05), but the serum glucose, urinary acid, creatinine, total bilirubin and glutamic oxaloacetic transaminase were significantly increased by adding 1,400 mg/kg zinc methionine to the laying hens (P0.05). Alkaline phosphatase activity (P0.01). 4) 20 times the recommended effective dose (1 400 mg/kg) of zinc methionine can cause damage and pathological changes in major organs and tissues. The results showed that the tolerance dose of zinc methionine was 700 mg / kg 路kg ~ (- 1) in the diet of laying hens.
【作者单位】：浙江大学动物科学学院农业部华东动物营养与饲料重点实验室;
【基金】：农业部饲料质量安全监管专项(2014) 东南沿海地区大学农业科技服务技术集成与示范(2013BAD20B02)
【分类号】：S831.5

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