动物营养学报2017，Vol.29Issue(5)：1759-1766,8.DOI:10.3969/j.issn.1006⁃267x.2017.05.036
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
Effects of Rumen?Protected Methionine on Ruminal Microbial Protein Production, Milk Performance and Nitrogen Excretion of Dairy Cows
摘要
Abstract
This experiment was conducted to determine the effects of rumen?protected methionine ( RPMet) on ruminal microbial protein ( MCP) production, milk performance and nitrogen excretion of dairy cows. Forty Holstein lactating cows with similar age, body weight, parity, milk yield, milk composition and lactation peri?od [(90±15) d] were randomly divided into 4 groups with 10 cows per group. The supplement level of RPMet in control and test groups 1, 2 and 3 was 0, 15, 25 and 35 g/(d·head), respectively. The pretest lasted for 15 d, and the test lasted for 60 d. The results showed as follows:1) ruminal MCP production in test groups 1, 2 and 3 was extremely significantly increased by 13.10%, 20.45% and 16.23% compared with con?trol group (P<0.01), respectively. 2) Milk yield in test groups 1, 2 and 3 was significantly increased by 8.12%, 13.32% and 10.32% compared with control group ( P<0.05 or P<0.01) , respectively; RPMet could significantly increase milk fat percentage and milk protein percentage ( P<0.05 or P<0.01) , and could signifi?cantly reduce milk somatic cell count ( P<0.05 or P<0.01) , especially test group 2 was the lowest. 3) Com?pared with control group, total nitrogen excretion in test groups was extremely significantly reduced ( P<0.01), and was reduced by 8.55%, 17.49% and 13.25% in test groups 1, 2 and 3, respectively. It can be seen that the addition of RPMet to diets can significantly increase ruminal MCP production, decrease nitrogen excretion, and improve the performance of dairy cows under the present experimental conditions. The optimal dosage of RPMet was 25 g/(d·head).关键词
过瘤胃蛋氨酸/瘤胃微生物蛋白/产奶性能/氮排泄Key words
rumen⁃protected methionine/ruminal microbial protein/milk performance/nitrogen excretion分类
农业科技引用本文复制引用
张成喜,孙友德,刘锡武,孙国强..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[J].动物营养学报,2017,29(5):1759-1766,8.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) （ SDAIT?09?08）
