不同生长高度王草瘤胃降解特性研究

doi:10.11843/j.issn.0366-6964.2015.10.013

Abstract

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.

CLC Number:

S815.4

LI Mao，ZI Xue-juan，BAI Chang-jun,ZHOU Han-lin，LIU Guo-dao. Rumen Degradation Characteristics of Kinggrass at Different Plant Heights[J]. ACTA VETERINARIA ET ZOOTECHNICA SINICA, 2015, 46(10): 1806-1815.

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Rumen Degradation Characteristics of Kinggrass at Different Plant Heights

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