利用体外模拟瘤胃发酵技术预测奶牛生产性能的研究

doi:10.16431/j.cnki.1671-7236.2018.08.015

Abstract

Abstract:

The object of this experiment was to predict the production performance of dairy cows by in vitro fermentation parameters of total mixed ration (TMR).The rumen fluid that was collected from two Holstein dairy cows with 550 kg body weight and permanent fistula,and 40 kinds of TMR were collected and used in the in vitro fermentation experiment,the contents of acetic acid,propionic acid,butyric acid, NH₃-N,CH₄,MCP,IVDMD,IVCPD and IVOMD of fermented liquid were determined when fermented for 24 h.The production performance of dairy cows fed TMR was recorded (milk yield,milk fat rate and milk protein rate),and the prediction model was established between them and the production performance of dairy cows.The results showed as follows:①Milk production and propionic acid content (r=0.37,P<0.05),MCP (r=0.40,P<0.05) were significantly positively correlated.However,it was extremely significantly negatively correlated with the IVCPD (r=-0.44,P<0.01).There was a significantly or extremely significantly positive correlation between milk fat rate and acetic acid content (r=0.55,P<0.01),CH₄ emission(r=0.36,P<0.05),MCP(r=0.40,P<0.05).There was an extremely significantly positive correlation between milk protein rate and MCP (r=0.91,P<0.01),IVDMD (r=0.44,P<0.01),IVCPD (r=0.45,P<0.01).However,it was extremely negatively correlated with the IVOMD (r=-0.56,P<0.01).②The production performance of Holstein dairy cows could be predicted using in vitro fermentation parameters.Milk production (kg/d)=29.72-0.86IVCPD (R²=0.73,RSD²=47.26,P<0.001).Milk fat rate (%)=0.40+0.06AA (R²=0.91,RSD²=0.15,P<0.001).Milk protein rate (%)=1.52+0.06MCP (R²=0.78,RSD²=0.01,P<0.001).The results showed the error between the predicted value and the actual value of production performance was within the allowable range,indicating that the equations were feasible.

Key words: dairy cow; in vitro fermentation technology; production performance; predictive model

CLC Number:

S823

YANG Jinshan, YUE Kuizhong, LIU Xin, NIKITA, ZHANG Guangning, LIU Yan, ZHANG Yonggen. Prediction of Dairy Cow Production Performance by in vitro Fermentation Technology[J]. , 2018, 45(8): 2167-2174.

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Prediction of Dairy Cow Production Performance by in vitro Fermentation Technology

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