Variations in the milk lipidomic profile of lactating dairy cows fed the diets containing alfalfa hay versus alfalfa silage  

作　　者：Kaizhen Liu Meiqing Chen Guoxin Huang Chuanyou Su Wenhao Tang Ning Li Jiyong Yang Xufang Wu Boxue Si Shengguo Zhao Nan Zheng Yangdong Zhang Jiaqi Wang 

机构地区：[1]Key Laboratory of Quality&Safety Control for Milk and Dairy Products of Ministry of Agriculture and Rural Affairs,Institute of Animal Sciences,Chinese Academy of Agricultural Sciences,Beijing 100193,China [2]Henan International Joint Laboratory of Nutrition Regulation and Ecological Raising of Domestic Animal,College of Animal Science and Technology,Henan Agricultural University,Zhengzhou 450046,China [3]State Key Laboratory of Animal Nutrition,Institute of Animal Sciences,Chinese Academy of Agricultural Sciences,Beijing 100193,China

出　　处：《Animal Nutrition》2024年第4期261-271,共11页动物营养(英文版)

基　　金：supported by National Key R&D Program of China(2022YFD1301000);The Agricultural Science and Technology Innovation Program(ASTIP-IAS12);The earmarked fund for CARS(CARS-36)。

摘　　要：Alfalfa is primarily stored as silage or hay in livestock production.Previous research has shown that the storage method of grass significantly influences milk composition.This study aimed to investigate milk production performance and lipid composition in dairy cows fed diets consisting of alfalfa hay or alfalfa silage as roughage.Forty-two mid-lactation Holstein dairy cows were selected and randomly divided into three groups,each receiving a total mixed ration consisting of alfalfa hay(AH),50%alfalfa silage+50%alfalfa hay(AHAS),or alfalfa silage(AS).The results showed that milk fat content(P=0.049)and milk fat yield(P<0.001)were significantly higher in the AH and AHAS groups compared to the AH group.With increased supplementation of alfalfa silage in the diet,u-3 polyunsaturated fatty acid content increased significantly(P<0.001),while u-6 polyunsaturated fatty acid content(P=0.007)and the ratio of u-6 to u-3 polyunsaturated fatty acids decreased(P<0.001).The contents of sphingomyelins,phosphatidylserines,phosphatidylethanolamines,and phosphatidylglycerols in the AHAS and AS samples were higher than in the AH samples,although the differences were not statistically significant.Additionally,the content of phosphatidylcholines was significantly higher in the AS group compared to the AH group(P=0.032).In conclusion,feeding dairy cows a diet consisting of alfalfa silage can increase the major phospholipid content and polyunsaturated fatty acid composition in raw milk,which is more conducive to human health.These findings provide valuable insights into the benefits of alfalfa silage for dairy cows.

关 键 词：Dairy cow Alfalfa silage Alfalfa hay Milk fat Lipidomic profile Fatty acid 

分 类 号：S54[农业科学—作物学]