| 蛋鸡对饲粮中蛋氨酸锌的耐受性研究 |
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| 引用本文： | 陈娜娜,何俊娜,郭阳,刘兵,熊平文,余东游.蛋鸡对饲粮中蛋氨酸锌的耐受性研究[J].动物营养学报,2017,29(2). |
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| 作者姓名： | 陈娜娜 何俊娜 郭阳 刘兵 熊平文 余东游 |
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| 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,杭州310058 |
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| 基金项目： | 农业部饲料质量安全监管专项，东南沿海地区大学农业科技服务技术集成与示范 |
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| 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。
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| 关 键 词： | 蛋鸡 蛋氨酸锌 耐受性 |
Tolerance of Laying Hens to Zinc-Methionine in Diet |
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| CHEN Nana,HE Junna,GUO Yang,LIU Bing,XIONG Pingwen,YU Dongyou.Tolerance of Laying Hens to Zinc-Methionine in Diet[J].Acta Zoonutrimenta Sinica,2017,29(2). |
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| Authors: | CHEN Nana HE Junna GUO Yang LIU Bing XIONG Pingwen YU Dongyou |
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| Abstract: | This experiment was conducted to determine the tolerant dosage of zinc-methionine supplementation in diet through evaluating its effects on performance, hematology indices and histopathological changes of laying hens.Five hundred and forty healthy 20-week-old Hy-Line white laying hens with similar body weight and laying rate were randomly allocated into 6 groups with 6 replicates per group and 15 birds per replicate.Birds were fed basal diets supplemented with 0 (control), 70 (the recommended available dose, RAD), 140 (two folds of RAD), 350 (five folds of RAD), 700 (ten folds of RAD) and 1 400 mg/kg (twenty folds of RAD) zinc-methionine, respectively.The trial lasted for 8 weeks.The results showed as follows : 1) compared with the control group, daily egg mass and laying rate were significantly increased and the ratio of feed to egg was significantly reduced in 70 and 140 mg/kg groups (P<0.05);there was no significant difference between350 or 700 mg/kg groups and control group in the above indices (P>0.05);compared with 0 to 700 mg/kg zinc-methionine, dietary supplemented with 1 400 mg/kg zinc-methionine significantly reduced daily egg mass and laying rate (P<0.01), and increased the ratio of feed to egg (P<0.01).2) Dietary zinc-methionine supplementation had no significant effects on blood routine parameters (P>0.05).3) Compared with the control group, dietary supplemented with 70 to 700 mg/kg zinc-methionine had no significant effects on serum biochemical indices (P > 0.05), however, supplemented with 1 400 mg/kg zinc-methionine significantly increased the contents of glucose, uric acid, creatinine and total bilirubin and improved the activities of glutamicoxalacetic transaminase and alkaline phosphatase (P<0.01).4) Dietary supplementation with twenty folds of RAD (1 400 mg/kg) zinc-methionine damaged major organ tissues.It is indicated that the tolerant dosage of zinc-methionine in laying hens diet is 700 mg/kg.Chinese Journal of Animal Nutrition, 2017, 29(2) :511 |
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| Keywords: | laying hens zinc-methionine tolerance |
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