高精料饲粮中添加烟酸对绵羊瘤胃发酵参数、微生物蛋白浓度和血清生化指标的影响  

Effects of Niacin Supplementation in High⁃Concentrate Diets on Rumen Fermentation Parameters,Microbial Protein Concentration and Serum Biochemical Indices of Sheep

作　　者：成志强 管勤超 臧长江 张瑞 焦毅灵 李凤鸣 李晓斌 杨开伦 雒秋江 李浩东 CHENG Zhiqiang;GUAN Qinchao;ZANG Changjiang;ZHANG Rui;JIAO Yiling;LI Fengming;LI Xiaobin;YANG Kailun;LUO Qiujiang;LI Haodong(Xinjiang Key Laboratory of Herbivore Nutrition for Meat&Milk Production,College of Animal Science,Xinjiang Agricultural University,Urumqi 830052,China)

机构地区：[1]新疆农业大学动物科学学院,新疆肉乳用草食动物营养实验室,乌鲁木齐830052

出　　处：《动物营养学报》2023年第8期5261-5270,共10页CHINESE JOURNAL OF ANIMAL NUTRITION

基　　金：国家自然科学基金项目(31960671);大学生创新项目(dxscx2023189)。

摘　　要：本试验旨在研究高精料饲粮中添加烟酸对绵羊瘤胃发酵参数、微生物蛋白浓度和血清生化指标的影响。选取8月龄左右、体重[(36.04±1.81) kg]相近且健康的哈萨克公羊24只,试验前安装好永久性瘤胃瘘管,随机分为4组,每组6只。对照组饲喂精粗比为70∶30的基础饲粮,试验Ⅰ、Ⅱ、Ⅲ组分别在饲喂基础饲粮的基础上补喂100、130和160 mg/d烟酸。试验期共18 d,其中预试期14 d,正试期4 d。结果显示:1)与对照组相比,饲喂后1、3、5、7 h试验Ⅱ组瘤胃液pH极显著提高(P<0.01);试验Ⅱ组瘤胃液氨态氮浓度在饲喂后1、3、5 h显著或极显著高于对照组(P<0.05或P<0.01);试验Ⅱ组瘤胃液丙酸浓度在饲喂后3 h极显著高于对照组及试验Ⅰ、Ⅲ组(P<0.01),在饲喂后5 h显著高于对照组和试验Ⅰ组(P<0.05)。2)试验Ⅱ组瘤胃液微生物蛋白浓度在饲喂前0 h以及饲喂后1、3、5、7 h均显著或极显著高于对照组(P<0.05或P<0.01)。3)试验Ⅱ组血清葡萄糖含量显著高于对照组和试验Ⅰ组(P<0.05)。综上所述,在精粗比为70∶30的高精料饲粮中添加130 mg/d烟酸提高了绵羊瘤胃液pH及氨态氮、丙酸及微生物蛋白浓度,同时提高了血清中葡萄糖含量。This study was conducted to investigate the effects of niacin supplementation in high⁃concentrate di⁃ets on rumen fermentation parameters,microbial protein concentration and serum biochemical indices of sheep.Twenty⁃four healthy Kazakh rams with similar body weight[(36.04±1.81)kg]and age(around 8 months)were selected,they were fitted with permanent rumen fistula before the trial and randomly divided into four groups with six sheep in each group.Sheep in control group were fed a basal diet with a concentrate⁃to⁃forage ratio of 70∶30,and those in trial groupsⅠ,ⅡandⅢwere fed the basal diet supplemented with 100,130 and 160 mg/d of niacin,respectively.The trial period was 18 days,which the preliminary trial period was 14 days and the formal trial period was 4 days.The results showed as follows:1)compared with the control group,the rumen fluid pH at 1,3,5 and 7 h after feeding in the trial groupⅡwas extremely significantly increased(P<0.01);the rumen fluid ammonia nitrogen(NH3⁃N)concentration at 1,3 and 5 h after feeding in the trial groupⅡwas significantly or extremely significantly higher than that in the control group(P<0.05 or P<0.01);the rumen fluid propionate concentration at 3 h after feeding in the trial groupⅡwas extremely signifi⁃cantly higher than that in the control group and the trail groupsⅠandⅡ(P<0.01),and the propionate con⁃centration at 5 h after feeding in the trail groupⅡwas significantly higher than that in the control group and the trail groupⅠ(P<0.05).2)The rumen fluid microbial protein concentration in the trail groupⅡwas signifi⁃cantly or extremely significantly higher than that in the control group at 0 h before feeding and 1,3,5 and 7 h after feeding(P<0.05 or P<0.01).3)The content of serum glucose in the trail groupⅡwas significantly higher than that in the control group and the trail groupⅠ(P<0.05).In conclusion,adding 130 mg/d niacin into the high⁃concentrate diet with the concentrate⁃to⁃forage ratio of 70∶30 can increase rumen fluid p

关 键 词：高精料饲粮 烟酸 绵羊 瘤胃发酵 微生物蛋白 血清生化指标 

分 类 号：S816[农业科学—饲料科学]