5种青贮饲料在奶牛瘤胃中的淀粉降解特性

doi:10.16431/j.cnki.1671-7236.2018.04.011

Abstract

Abstract:

This experiment was conducted to investigate starch degradation characters and analyze the effective degradation rate and real-time degradation rate in the rumen of 5 silages,including alfalfa silage,whole wheat silage,oat silage and 2 whole corn silages,in order to estimate starch degradation rate according to degradation rate of a single time and update the relevant data of starch in silages for Chinese Dairy Cattle Nutrient Requirements.4 Holstein cows with permanent ruminal cannulas were selected and nylon-bag technique was used to determine the dynamic and effective degradation rate of starch.The time points of nylon-bag technigue were 4,8,12,24,30,36,48 and 72 h in the rumen of dairy cows with 4 parallels for each cow.The results showed as follows:①The degradability of starch increased gradually over time,and tended to be steady after 24 h.The effective degradability of starch of whole wheat silage was significantly higher than that of oat silage,alfalfa silage and whole corn silage (P < 0.05),which was decreased in turn.②There was a strong correlation between effective degradability and dynamic degradability of starch at 8 h with R² was 0.9876.It was viable that rumen degradability of starch at 8 h could be used to determine starch degradability of silage in the rumen of dairy cows.The results of the test had reference value for designing diet of dairy cows.

Key words: silage; starch; rumen degradation rate; correlation

CLC Number:

S816.6

LIU Yanfang, MA Jian, LI Shengli, YU Xiong. Starch Degradation Characteristics of Five Kinds of Silage in the Rumen of Dairy Cows[J]. , 2018, 45(4): 925-932.

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Starch Degradation Characteristics of Five Kinds of Silage in the Rumen of Dairy Cows

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