瘤胃能氮同步释放对奶牛微生物蛋白合成和瘤胃发酵的影响

doi:10.16431/j.cnki.1671-7236.2015.02.022

Abstract

Abstract: The objective of this experiment was to study the effect of synchronizing the rate of dietary energy and nitrogen release in diets on microbial protein synthesis and rumen fermentation in dairy cows using in vitro gas production method.Four healthy Holstein cows in mid-lactation were used to offer rumen juice.A single factor experimental design and three isoenergetic and isonitrogenous diets varying in synchronization index (SI) were used in this study (diet A,SI=0.74;diet B,SI=0.83;diet C,SI=0.91).The results showed that microbial protein production was significantly increased (P<0.05),and NH₃-N concentrtatin was extremely significantly decreased in 8 and 12 h as synchrony level of diets increased (P<0.01).In 8 h,group A compared with group B,gas production,pH eached significant or extremely significant difference (P<0.05;P<0.01),in 12 h,group A compared with group B,the volatile fatty acid content was extremely significant difference (P<0.01).The results indicated that synchronization of dietary energy and nitrogen release had significant influence on microbial protein synthesis and NH₃-N concentration for dairy cows.

Key words: synchrony index; microbial protein; rumen fermentation; dairy cows

CLC Number:

S823.9⁺1

ZHANG Jun-yu, ZANG Chang-jiang, WANG Wen-qi, GUO Tong-jun, WANG Shi-chang, SANG Duan-ji. Effect of Synchronizing the Rate of Dietary Energy and Nitrogen Release in Diets on Microbial Protein Synthesis and Rumen Fermentation in Dairy Cows[J]. , 2015, 42(2): 375-381.

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Effect of Synchronizing the Rate of Dietary Energy and Nitrogen Release in Diets on Microbial Protein Synthesis and Rumen Fermentation in Dairy Cows

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