畜牧兽医学报 ›› 2015, Vol. 46 ›› Issue (10): 1806-1815.doi: 10.11843/j.issn.0366-6964.2015.10.013

• 动物营养 • 上一篇    下一篇

不同生长高度王草瘤胃降解特性研究

李茂1,字学娟1,2,白昌军1,周汉林1*,刘国道1*   

  1. (1.中国热带农业科学院热带作物品种资源研究所,儋州 571737;2.海南大学应用科技学院,儋州 571737)
  • 收稿日期:2014-11-04 出版日期:2015-10-23 发布日期:2015-10-23
  • 通讯作者: 周汉林,研究员, E-mail:zhouhanlin8@163.com;刘国道,研究员, E-mail:liuguodao2008@163.com
  • 作者简介:李茂(1984-),男,四川绵阳人,硕士,助理研究员,主要从事热带牧草和反刍动物营养研究,E-mail:limaohn@163.com
  • 基金资助:

    海南省自然科学基金(314127);中国热带农业科学院基本科研业务费(1630032014001)

Rumen Degradation Characteristics of Kinggrass at Different Plant Heights

LI Mao1,ZI Xue-juan1,2,BAI Chang-jun1,ZHOU Han-lin1* ,LIU Guo-dao1*   

  1. (1.Tropical Crops Genetic Resources Institute,Chinese Academy of Tropical Agricultural Sciences,Danzhou 571737,China;2.College of Applied Science and Technology,Hainan University,Danzhou 571737,China)
  • Received:2014-11-04 Online:2015-10-23 Published:2015-10-23

摘要:

本试验旨在研究不同生长高度王草营养成分的动态变化及其在海南黑山羊瘤胃内的降解特性。王草分别在株高为90、120、150、180、210、240和270 cm时刈割并制成样品,测定常规营养成分含量。选用安装有永久性瘤胃瘘管的海南黑山羊3 只,采用尼龙袋法评定其干物质(DM)、粗蛋白质(CP)和中性洗涤纤维(NDF)的瘤胃降解率和有效降解率。试验结果表明,王草主要营养成分随生长高度增加而变化,其中CP随生长高度增加而降低,ADF、NDF含量随生长高度增加而升高,180 cm后粗饲料等级较低;不同生长高度王草瘤胃降解率在48 h前增长较快,48~72 h逐渐趋于稳定,降解速率由低到高再降低;各个时间点的DM、CP和NDF降解率随着生长高度的增加而降低;王草DM、CP和NDF的慢速降解部分在180 cm时最高,降解速率在150或180 cm时最高;王草主要营养成分快速降解部分、潜在降解部分和有效降解率随生长高度而降低。综合考虑不同生长高度王草主要营养成分含量、粗饲料等级和瘤胃降解特性,王草在生长高度低于180 cm时具有较高的饲用价值。

Abstract:

The aim of this experiment was to investigate the dynamics of nutrient composition and rumen degradation characteristics of Kinggrass at different plant heights in Hainan Black goat.Kinggrass was cut and sampled when the plants height were 90,120,150,180,210,240 and 270 cm,respectively,and their nutrient compositions were determined.Rumen degradability and effective digestibility (ED) of dry matter (DM),crude protein (CP) and neutral detergent fiber (NDF) were determined by the rumen nylon-bag technique with 3 Hainan Black goats with permanent rumen cannulas.The results showed as follows:The nutrient composition of Kinggrass changed with increasing plant height,CP content decreased but acid detergent fiber (ADF) and NDF content increased,and Kinggrass had the lower mixture quality standard when the plant was higher than 180 cm.Kinggrass rumen degradability at different plant heights increased faster before 48 h,from 48 to 72 h gradually stabilized,and the rate of degradation of slowly degradable fraction from low to high and then decreased.Rumen degradability of DM,CP and NDF at different periods decreased with increasing plant height.The slowly degradable fraction of DM,CP and NDF were highest at 180 cm and the rate of degradation were highest at 150 or 180 cm.The rapidly degradable fraction,potentially degradable fraction and ED of Kinggrass decreased with increasing plant height.In conclusion,considering nutrient composition,mixture quality standard and rumen degradation characteristics of Kinggrass at different plant heights,it have the higher feeding value when the plant is lower than 180 cm.

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