草地学报

草地学报 ›› 2021, Vol. 29 ›› Issue (8): 1729-1737.DOI: 10.11733/j.issn.1007-0435.2021.08.016

• 研究论文 • 上一篇    下一篇

不同季节高寒草甸牧草瘤胃发酵特性和体外消化率分析

姚喜喜1, 才华2, 刘皓栋3, 李长慧1   

  1. 1. 青海大学农牧学院, 青海 西宁 810016;
    2. 青海省泽曲林场, 青海 黄南 811400;
    3. 甘肃畜牧工程职业技术学院, 甘肃 武威 733006
  • 收稿日期:2021-04-16 修回日期:2021-06-01 出版日期:2021-08-15 发布日期:2021-09-06
  • 通讯作者: 李长慧,E-mail:746886595@qq.com
  • 作者简介:姚喜喜(1989-),男,甘肃庆阳人,博士,讲师,主要从事反刍动物营养学和草地生态学交叉学科方面研究,E-mail:18993075304@163.com
  • 基金资助:
    泽曲国家公园湿地保护与恢复项目（2020-Z-1）；2021甘肃省高等学校创新基金项目（2021A-270）；青海大学科研启动费资金项目（41510406）资助

Analysis of Rumen Fermentation Characteristics and In Vitro Digestibility of Alpine Meadow Forage in Different Seasons

YAO Xi-xi1, CAI Hua2, LIU Hao-dong3, LI Chang-hui1   

  1. 1. College of Agriculture and Animal Husbandry, Qinghai University, Xining, Qinghai Province 810016, China;
    2. Zequ Forest Farm of Zeku County of Qinghai Province, Huangnan, Qinghai Province 811400, China;
    3. Gansu Polytechnic College of Animal Husbandry & Engineering, Wuwei, Gansu province 733006, China
  • Received:2021-04-16 Revised:2021-06-01 Online:2021-08-15 Published:2021-09-06

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摘要： 本文旨在探讨不同生育时期高寒草甸牧草的牦牛瘤胃体外发酵参数及CH4产量。通过测定返青期、青草期和枯草期3个生育时期牧草的营养品质、瘤胃发酵参数和CH4产量。结果表明：青草期牧草总能（Gross energy，GE）、粗蛋白（Crude protein，CP）和粗脂肪（Ether extract，EE）等均显著高于返青期和枯草期（P<0.05）；青草期牧草在各发酵时间点的体外干物质消化率（Dry matter digestibility，DMD）、粗蛋白消化率（Crude protein digestibility，CPD）和有机物质消化率（Organic matter digestibility，OMD）均显著高于返青期和枯草期（P<0.05）；青草期牧草12，24和48 h瘤胃NH3-N、乙酸、丙酸、异丁酸、丁酸和异戊酸含量显著高于返青期和枯黄期（P<0.05）；不同发酵时间牧草总产气量和CH4产量变化规律为：返青期>青草期>枯草期。综上所述，青草期草地生物量最高，牧草营养品质和体外消化率最高，CH4排放最低，瘤胃发酵模式最优。建议选择青草期牧草放牧。

关键词: 生育时期, 瘤胃发酵, 牧草品质, 发酵参数, CH4产量

Abstract: The purpose of this paper was to investigate the in vitro fermentation parameters and CH4 yield of yak rumen in alpine meadow forages at different growth periods. The nutritional quality, rumen fermentation parameters and CH4 yield of forage at three growth periods in regreen stage, grassy stage and withering stage were measured. The results showed that:The total energy (GE), crude protein (CP) and crude fat (EE) of forage in green stage were significantly higher than those in green stage and dry grass stage (P<0.05);The dry matter digestibility (DMD), crude protein digestibility (CPD) and organic matter digestibility (OMD) of forage in green stage were significantly higher than those in green stage and dry grass stage (P<0.05);The contents of NH3-N, acetic acid, propionic acid, isobutyric acid, butyric acid and isovaleric acid in rumen at 12, 24 and 48 h in grass stage were significantly higher than those in green stage and dry yellow stage (P<0.05);The variation rules of total gas production and CH4 yield of forage at different fermentation times were as follows:regreen stage > grassy stage > withering stage. In conclusion, the grassland biomass is the highest, the forage nutritional quality and in vitro digestibility are the highest, the CH4 emission is the lowest, and the rumen fermentation mode is the best. It is suggested to graze the animals at grassy stage.

Key words: Growth stages, Rumen fermentation, Nutritional quality, Fermentation parameters, CH4production

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