不同物候期牧草对放牧绵羊瘤胃发酵指标的影响

doi:10.16431/j.cnki.1671-7236.2018.03.018

Abstract

Abstract:

This experiment was aimed to study the effects of the natural grass in different phenological period on ruminal environment parameters of the grazing sheep.The nutritional components were determined in the mixed grass of different phenophases (green grass stage,grassy stage and hay stage) with different quadrats.In each stage,six grazing sheep were chosen to measure the pH,the ammonia nitrogen (NH₃-N) contents and volatile fatty acids (VFA) in rumens.The results showed that:①The CP content in green grass stage was significant higher than that in other stages (P < 0.05),and that in hay stage was lowest which was 5.14%.NDF content was increased with the growth of grasses,and the content of ADF in green grass stage was the lowest.②The ruminal environment parameters of grazing sheep changed with nutritional components in different stages.The pH in grassy stage was significantly lower than that in other stages (P < 0.05),the NH₃-N content was significantly lower in hay stage than that in other stages (P < 0.05).VFA content in hay stage was the lowest,and that in grassy stage was significantly higher than green grass stage (P < 0.05).In conclusion,at the hay stage,the dramatically decreased amount of CP consumed by grazing sheep had affected the favorable conditions in rumens,which would lead to a lower digestibility and dissatisfaction of the nutrient needs of grazing sheep.Therefore,from hay stage to gress grass stage,the grazing sheep should fed some reasonable supplementary to adjust and control the rumen fermentation,improve the ruminal environment and nutrition absorption.

Key words: grazing sheep; rumen fermentation; native grass; phenophases; nutritive value

CLC Number:

S826

ZHANG Panpan, XUE Shuyuan, JIN Hai, LI Changqing, CUI Can, ZHAO Yuhang. Effects of Different Phenophase on Rumen Fermentation of Grazing Sheep[J]. , 2018, 45(3): 698-704.

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Effects of Different Phenophase on Rumen Fermentation of Grazing Sheep

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