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Dietary supplementation with xylooligosaccharides and exogenous enzyme improves milk production,energy utilization efficiency and reduces enteric methane emissions of Jersey cows

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Journal of Animal Science and Biotechnology 2023年第6期14卷 2514-2524页

作者： Lifeng Dong Lei Zhao Bowei Li Yanhua Gao Tianhai Yan Peter Lund Zhuofan Liu Qiyu Diao Institute of Feed Research/Sino‑US Joint Lab On Nutrition and Metabolism of Ruminant Chinese Academy of Agricultural SciencesBeijing 100081China. School of Agriculture Ningxia UniversityYinchuan 750000China. College of Life Science and Technology Southwest Minzu UniversityChengdu 610041China. Agri-Food and Biosciences Institute Hillsborough Co.Down BT 266DRUK. Department of Animal Science Aarhus UniversityAU FoulumPO Box 508830 TjeleDenmark.

Background Sustainable strategies for enteric methane(CH_(4))mitigation of dairy cows have been extensively explored to improve production performance and alleviate environmental pressure.The present study aimed to investigate the effects of dietary xylooligosaccharides(XOS)and exogenous enzyme(EXE)supplementation on milk production,nutrient digestibility,enteric CH_(4) emissions,energy utilization efficiency of lactating Jersey dairy cows.Forty-eight lactating cows were randomly assigned to one of 4 treatments:(1)control diet(CON),(2)CON with 25 g/d XOS(XOS),(3)CON with 15 g/d EXE(EXE),and(4)CON with 25 g/d XOS and 15 g/d EXE(XOS+EXE).The 60-d experimental period consisted of a 14-d adaptation period and a 46-d sampling period.The enteric CO_(2)and CH_(4) emissions and O2 consumption were measured using two GreenFeed units,which were further used to determine the energy utilization efficiency of cows.Results Compared with CON,cows fed XOS,EXE or XOS+EXE significantly(Penteric CH_(4) emissions of lactating Jersey cows.This promising mitigation method may need further research to validate its long-term effect and mode of action for dairy cows.

关键词： Energy utilization efficiency enteric methane emissions Exogenous enzyme Jersey cows Xylooligosaccharides

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Characterization and mitigation option of greenhouse gas emissions from lactating Holstein dairy cows in East China

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Journal of Animal Science and Biotechnology 2022年第6期13卷 1959-1972页

作者： Peng Jia Yan Tu Zhihao Liu Qi Lai Fadi Li Lifeng Dong Qiyu Diao State Key Laboratory of Grassland Agro-ecosystems Key Laboratory of Grassland Livestock Industry InnovationMinistry of Agriculture and Rural AffairsEngineering Research Center of Grassland IndustryMinistry of EducationCollege of Pastoral Agriculture Science and TechnologyLanzhou UniversityLanzhou 730020People’s Republic of China Institute of Feed Research Chinese Academy of Agricultural Sciences/Sino-US Joint Lab on Nutrition and Metabolism of RuminantBeijing 100081People’s Republic of China College of Animal Science and Technology Henan University of Science and TechnologyLuoyang 471003People’s Republic of China College of Animal and Veterinary Sciences Southwest Minzu UniversityChengdu 610041People’s Republic of China.

Background:This study investigated greenhouse gas(GHG)emission characteristics of lactating Holstein dairy cows in East China and provided a basis for formulating GHG emission reduction measures.GreenFeed system was used to measure the amount of methane(CH_(4))and carbon dioxide(CO_(2))emitted by the cows through respiration.Data from a commercial cow farm were used to observe the effects of parity,body weight,milk yield,and milk component yield on CH_(4) and CO_(2) emissions.Results:Mean herd responses throughout the study were as follows:111 cows completed all experimental processes,while 42 cows were rejected because they were sick or had not visited the GreenFeed system 20 times.On average,lactating days of cows was 138±19.04 d,metabolic weight was 136.5±9.5 kg,parity was 2.8±1.0,dry matter intake(DMI)was 23.1±2.6 kg/d,and milk yield was 38.1±6.9 kg/d.The GreenFeed system revealed that CH_(4) production(expressed in CO_(2) equivalent,CO_(2)-eq)was found to be 8304 g/d,CH_(4)_(CO_(2)−eq)/DMI was 359 g/kg,CH_(4)_(CO_(2)−eq)/energy-corrected milk(ECM)was 229.5 g/kg,total CO_(2) production(CH_(4) production plus CO_(2) production)was 19,201 g/d,total CO_(2)/DMI was 831 g/kg,and total CO_(2)/ECM was 531 g/kg.The parity and metabolic weight of cows had no significant effect on total CO_(2) emissions(P>0.05).Cows with high milk yield,milk fat yield,milk protein yield,and total milk solids yield produced more total CO_(2)(Pemissions,while the total CO_(2)/ECM was negatively correlated with milk yield,milk fat yield,milk protein yield,and total milk solids yield in lactating Holstein dairy cows.Measurement of total CO_(2) emissions of dairy cows in the Chinese production system will help establish regional or national GHG inventories and develop m

关键词： enteric methane emissions GreenFeed system Holstein dairy cows Mitigation option Production performance

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