日粮添加干玉米酒糟对泌乳奶牛干物质采食量、泌乳性能和瘤胃发酵的影响  

Effects of dietary supplementation of corn dried distillers grains with solubles on dry matter intake,lactation performance and rumen fermentation of lactating cows

作　　者：李平[1] 孙玉龙[1] 廖吉林[1] LI Ping;SUN Yulong;LIAO Jilin(Dazhou Vocational And Technial College,Dazhou,Sichuan Province 635000,China)

机构地区：[1]四川达州职业技术学院

出　　处：《中国饲料》2019年第14期93-98,共6页China Feed

摘　　要：文章旨在研究日粮中添加不同比例的干玉米酒糟对泌乳奶牛干物质采食量、泌乳性能和瘤胃发酵的影响。试验选择45头健康的中国荷斯坦奶牛,按照胎次、泌乳天数和产奶量进行区组设计,随机分配到3个处理组中,每组15头牛。对照组奶牛饲喂以玉米和豆粕为基础的日粮,不含有干玉米酒糟,试验1组和试验2组奶牛饲喂的日粮均以干玉米酒糟替代部分玉米和豆粕,替代比例分别为10%和20%(干物质基础)。预试期为2周,正试期为10周。试验结果表明,日粮添加干玉米酒糟显著提高了泌乳奶牛干物质采食量(P<0.05),而不同干玉米酒糟添加比例对奶牛的干物质采食量无显著影响(P>0.05)。日粮添加干玉米酒糟显著提高了泌乳奶牛的产奶量,且呈剂量依赖效应(P<0.05)。日粮添加干玉米酒糟对乳成分无显著影响(P>0.05),但由于产奶量的增加显著增加了乳中营养成分含量(P<0.05)。日粮添加干玉米酒糟改变了瘤胃发酵模式,降低了瘤胃液乙酸摩尔比值(P<0.05),增加了丙酸和丁酸摩尔比值(P<0.05),降低了瘤胃液NH3-N浓度。因此,可以使用干玉米酒糟替代部分玉米和豆粕来配合奶牛日粮,本试验中以20%的添加量较为合适。This study was conducted to investigate the effects of different proportions of corn dried distillers grains with solubles(CDDGS)on dry matter intake,lactation performance and rumen fermentation of lactating cows.A total of 45 healthy Chinese Holstein cows were selected and blocked by parity,milk yield and days in milk.They were randomly allocated to three treatment groups:control,experimental group one and experimental group two.Dairy cows in the control group were fed a diet based on corn and soybean meal without CDDGS.Dairy cows in experimental group one and experimental group two were fed with CDDGS in place of corn and soybean meal,with the substitution ratio of 10%and 20%(dry matter basis),respectively.The pre-trial period was 2 weeks and the trial period was 10 weeks.The results showed that dietary supplementation of CDDGS significantly increased dry matter intake of lactating dairy cows(P<0.05),while different proportion of CDDGS had no significant effect on dry matter intake of dairy cows(P>0.05).The supplementation of CDDGS significantly increased the milk yield of lactating cows and presented a dose-dependent effect(P<0.05).The supplementation of CDDGS had no significant effect on the milk composition(P>0.05),but the increase in milk production significantly increased the yield of nutrients in milk(P<0.05).The supplementation of CDDGS changed the rumen fermentation mode,reduced the molar proportion of acetic acid in the rumen fluid(P<0.05),increased the molar proportion of propionic acid and butyric acid(P<0.05),and reduced the concentration of NH3-N in the rumen fluid.Therefore,corn dried distillers grains with solubles can be used to replace part of corn and soybean meal to formulate dairy cow’s diet.In this experiment,the addition of 20%was recommended.

关 键 词：干玉米酒糟 奶牛 采食量 泌乳性能 瘤胃发酵 

分 类 号：S823[农业科学—畜牧学]