过瘤胃蛋氨酸对奶牛瘤胃微生物蛋白产量、产奶性能和氮排泄的影响

发布时间：2018-04-01 06:26

本文选题：过瘤胃蛋氨酸　切入点：瘤胃微生物蛋白　出处：《动物营养学报》2017年05期

【摘要】：本试验旨在研究过瘤胃蛋氨酸(RPMet)对奶牛瘤胃微生物蛋白(MCP)产量、产奶性能及氮排泄的影响。选取年龄、体重、胎次、产奶量、乳成分及泌乳期[(90±15)d]相近的荷斯坦奶牛40头,随机分为4组,每组10头,对照组和试验1组、2组、3组分别添加0、15、25和35 g/(d·头)RPMet。预试期15 d,正试期60 d。结果表明:1)各试验组瘤胃MCP的产量均极显著高于对照组(P0.01),试验1组、2组、3组分别比对照组提高了13.10%、20.45%、16.23%。2)试验组产奶量显著或极显著高于对照组(P0.05或P0.01),试验1组、2组、3组分别比对照组提高了8.12%、13.32%、10.32%;RPMet能显著或极显著提高乳脂率和乳蛋白率(P0.05或P0.01),显著或极显著降低了乳体细胞数(P0.05或P0.01),以试验2组最低。3)在氮总排出量方面,各试验组均极显著低于对照组(P0.01),试验1组、2组、3组分别比对照组降低了8.55%、17.49%、13.25%。由此可知,在本试验条件下,饲粮中添加RPMet可以显著提高奶牛瘤胃MCP产量,减少氮排泄,提高奶牛生产性能。综合各项试验指标,RPMet的最适添加量为25 g/(d·头)。
[Abstract]:The purpose of this study was to study the effects of rumen methionine (RPMet) on the production, milk yield and nitrogen excretion of rumen microbial protein (MCPP) in dairy cows.Forty Holstein cows with similar age, body weight, birth order, milk yield, milk composition and lactation period [90 卤15 days] were randomly divided into 4 groups (10 in each group).The pretest period was 15 days and the current test period was 60 days.The results showed that the yield of rumen MCP in each trial group was significantly higher than that in control group P0.01, and the milk yield of test group 1 was significantly higher than that of control group (P 0.05 or P 0.01), and the milk yield of test group 1 was significantly higher than that of control group 2 (P 0.05 or P 0.01), and the milk yield of test 1 group 2 was significantly higher than that of control group (P 0.05 or P 0.01), and the milk yield of test group 2 was significantly higher than that of control group (P 0.05 or P 0.01).Compared with the control group, the RPMet increased 8.12% 13.32% and 10.32% RPMet significantly or extremely significantly increased the milk fat rate and milk protein rate (P 0.05 or P 0.01), significantly or extremely significantly decreased the number of milk body cells (P 0.05 or P 0.01).All the experimental groups were significantly lower than the control group (P 0.01), and group 1 and group 2 were lower than the control group by 8.55% 17.49% 13.25% respectively.It can be seen that under the condition of this experiment, the addition of RPMet in diet can significantly increase the rumen MCP yield, reduce nitrogen excretion and improve the performance of dairy cows.The optimum addition of RPMet was 25 g / L.
【作者单位】：青岛农业大学动物科技学院;青岛市畜牧兽医研究所;
【基金】：基金项目山东省现代农业产业技术体系牛产业创新团队(SDAIT-09-08)
【分类号】：S823.5

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