Dietary fat and carbohydrate-balancing the lactation performance and methane emissions in the dairy cow industry:A meta-analysis

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外文摘要：For the agroecosystems of the dairy cow industry,dietary carbohydrate(starch,neutral detergent fiber[NDF])and fat could directly affect rumen methane emissions and host energy utilization.However,the relationships among diet,lactation performance,and methane emissions need to be further determined to assist dairy farms to adjust diet formulations and feeding strategies for environmental and production management.A meta-analysis was conducted in the current study to explore quantitative patterns of dietary fat and carbohydrate at different levels in balancing lactation performance and environment sustainability of dairy cows,and to establish a methane emission prediction model using the artificial neural network(ANN)model.The results showed that the regression relationship between dietary fat,carbohydrate and methane emissions could be shown by the following models:methane=106.78+(14.86 × DMI),R2=0.80;methane=443.17-(46.41 × starch/NDF),R2=0.76;and methane=388.91+(31.40 × fat)-(5.42 × fat2),R2=0.80.The regression relationships between dietary fat,carbohydrate and lactation performance could be shown by the following models:milk fat yield=1.08+(0.43 × starch/NDF)-[0.34 ×(starch/NDF)2],R2=0.79;milk protein yield=0.68+(0.15 × fat)-(0.016 × fat2),R2=0.82.In the structural equation model,we found that when formulating dietary carbohydrates and fats,it was necessary to balance the relationship between methane emissions and lactation performance.Specifically,dietary starch/NDF was lower than 0.63(extremum point)and dietary fat was between 2.89％and 4.69％(extremum point),it could ensure that the aim of methane emission reduction(methane emissions decrease with increasing dietary starch/NDF and fat)was achieved without losing lactation performance of dairy cows(lactation performance increase with increasing dietary starch/NDF and fat).Finally,we established the ANN model to predict methane emissions(training set:R2=0.62;validation set:R2=0.61).

外文关键词：

Dietary fat and carbohydrateEnvironment sustainabilityLactation performanceDairy cowMeta-analysis

作者：

Chenguang Zhang、Xingwei Jiang、Shengru Wu、Jun Zhang、Yue Wang、Zongjun Li、Junhu Yao

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作者单位：

College of Animal Science and Technology,Northwest A&F University,Yangling 712100,Shaanxi,China

基金：

National Key Research and Development Program of ChinaNational Natural Science Foundation of China,ChinaHigh-Performance Computing Platform of Northwest A&F University

项目编号：

2023YFE011180032272829

出版年：

2024

DOI：

10.1016/j.aninu.2024.02.004

动物营养(英文)

CSTPCD

ISSN：

年,卷(期)：2024.17(2)