蛋氨酸锌对蛋鸡生产性能、肠道形态、组织学结构及盲肠微生物菌群的影响

发布时间：2018-06-08 00:33

本文选题：蛋氨酸锌 + 蛋鸡　；参考：《中国畜牧杂志》2017年09期

【摘要】：本试验旨在研究饲粮中添加蛋氨酸锌对蛋鸡蛋品质、肠道形态、组织学结构及盲肠微生物菌群的影响,以确定蛋氨酸锌在蛋鸡饲粮中的科学用量。选择健康的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。I组为对照组,饲喂基础饲粮,试验II、III、IV、V、VI组分别在基础饲粮中添加70、140、350、700、1 400 mg/kg蛋氨酸锌。正试期8周。结果表明:与对照组相比,II、III组产蛋率和日产蛋重显著提高(P0.05),料蛋比和不合格蛋率显著降低(P0.05),蛋壳强度、蛋壳厚度、蛋白高度和哈氏单位显著提高(P0.05),十二指肠、回肠的绒毛高度和绒毛高度/隐窝深度显著提高(P0.05),盲肠内容物中双歧杆菌、乳杆菌数量显著增加(P0.05),大肠杆菌数量显著减少(P0.05);而VI组产蛋率和日产蛋重极显著降低(P0.01),料蛋比和不合格蛋率极显著升高(P0.01),蛋壳强度、蛋壳厚度、蛋白高度和哈氏单位极显著降低(P0.01),十二指肠、回肠的绒毛高度和绒毛高度/隐窝深度极显著降低(P0.01),双歧杆菌和乳杆菌数量极显著减少(P0.01),大肠杆菌数量极显著增加(P0.01);VI组蛋鸡十二指肠和回肠结构发生损伤。由此可见,适量的蛋氨酸锌可提高蛋鸡产蛋性能和蛋品质、改善肠道形态、优化盲肠微生物区系,但继续提高添加水平会降低其对蛋鸡产蛋性能、蛋品质和肠道健康的正面效应,甚至会引起负面效应。根据二次曲线拟合模型得出蛋氨酸锌在20~27周龄蛋鸡玉米—豆粕型饲粮中的适宜添加水平为50~100 mg/kg。
[Abstract]:The purpose of this study was to study the effects of zinc methionine on egg quality, intestinal morphology, histological structure and microflora of cecum in order to determine the scientific dosage of zinc methionine in the diet of laying hens. A total of 540 healthy 20-week-old Hailanbai layers were randomly divided into 6 groups with 6 repeats in each group and 15 chickens in each group as control group, fed with basic diet. In the experiment, the basal diet was supplemented with zinc methionine in the basal diet. The trial period is 8 weeks. The results showed that compared with the control group, the egg laying rate and the daily egg weight in the control group were significantly higher than those in the control group, while the feed / egg ratio and the unqualified egg rate were significantly decreased, the egg shell strength, the eggshell thickness, the protein height and the Hardner unit were significantly increased (P 0.05, duodenum). The villi height and villus height / crypt depth of ileum significantly increased P0.05, bifidobacterium in cecum contents, The number of Lactobacillus increased significantly, the number of Escherichia coli decreased significantly, while the laying rate and daily egg weight of group VI were significantly decreased, the feed / egg ratio and unqualified egg rate were significantly increased, egg shell strength and egg shell thickness were significantly increased. The protein height and Hardy unit significantly decreased P0.01a, duodenum, duodenum, The villi height and villus height / crypt depth of ileum were significantly decreased (P 0.01), the number of Bifidobacterium and Lactobacillus were significantly decreased (P 0.01), and the number of E. coli was significantly increased. It can be seen that proper amount of zinc methionine can improve laying performance and egg quality, improve intestinal morphology, optimize cecum microbial flora, but continue to increase the level of adding will reduce the laying performance of laying hens. The positive effects of egg quality and intestinal health may even lead to negative effects. According to the conic curve fitting model, the suitable supplementation level of zinc methionine in the corn-soybean meal diet of 20-27 weeks old laying hens was 50 ~ 100 mg / kg 路kg ~ (-1).
【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】：“十二五”国家科技支撑计划(2013BAD20B02) 农业部饲料质量安全监管专项(2014)
【分类号】：S831.5

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