不同牧草来源日粮对奶牛瘤胃发酵和微生物蛋白合成的影响

发布时间：2018-03-29 01:23

本文选题：粗饲料　切入点：瘤胃发酵　出处：《中国饲料》2017年08期

【摘要】：试验旨在研究不同牧草来源日粮对奶牛瘤胃发酵和微生物蛋白合成的影响。选用8头体重为(632±12)kg泌乳中期奶牛(135±16 DIM),随机分为4组,采用4×4重复拉丁方设计,共4期,每期21 d,其中14 d适应期,7 d采样期。四组日粮均以玉米青贮为基础,粗饲料分别由苜蓿草、燕麦草、羊草和稻草组成,日粮等能等氮且中性洗涤纤维(NDF)和非纤维性碳水化合物(NFC)含量相同。结果显示:(1)四组日粮中奶牛干物质采食量(DMI)差异不显著(P0.05),瘤胃液p H、NH3-N、总挥发性脂肪酸(TVFA)和支链挥发性脂肪酸浓度均无显著差异(P0.05),稻草组乙酸含量偏低,丙酸含量偏高,但与其他三组并无显著差异(P0.05)。(2)稻草组奶牛每日尿排泄量有增加的趋势(P=0.08),牧草来源对每日尿酸排泄量无显著影响(P=0.87),但稻草组中尿囊素显著低于苜蓿草、燕麦草和羊草组(P=0.01),造成总嘌呤衍生物(PD)含量显著降低(P=0.01),稻草组微生物蛋白(MCP)产量比苜蓿草组降低124 g/d。综上可知,在日粮NDF和NFC含量相同的条件下,不同牧草来源日粮对奶牛瘤胃发酵无显著影响,且苜蓿草、燕麦草和稻草组微生物蛋白合成无显著差异。
[Abstract]:The purpose of the experiment was to study the effects of different forage diets on rumen fermentation and microorganism protein synthesis in dairy cows. Eight cows with body weight of 632 卤12)kg were randomly divided into 4 groups, and 4 脳 4 repeated Latin square designs were used for 4 stages. The diet of the four groups was based on corn silage, and the forage was composed of alfalfa, oat, Leymus chinensis and straw, respectively. The results showed that there was no significant difference in dry matter intake (DMIs) between the four groups (P < 0.05), rumen fluid (p HH) NH _ 3-N, total volatile fatty acid (TFA) and total volatile fatty acid (TFA). There was no significant difference in the concentration of chain volatile fatty acids between the two groups (P 0.05), and the acetic acid content in rice straw group was lower than that in the control group. The content of propionic acid was on the high side, but there was no significant difference with the other three groups. (P 0.05. 0. 0. 2) the daily urine excretion of the rice straw group had a tendency to increase, and the forage source had no significant effect on the daily uric acid excretion, but the allantoin in the straw group was significantly lower than that in the alfalfa grass group, but the content of allantoin in the rice straw group was significantly lower than that in the alfalfa grass group. The total purine derivative (PDD) content was significantly decreased in oat and Leymus chinensis groups, and the microbial protein production in straw group was 124g / d lower than that in alfalfa group. There was no significant difference in microbial protein synthesis among alfalfa, oat and straw groups.
【作者单位】：南昌市农业科学院;江西省农业科学院农产品质量安全与标准研究所;江西省农业科学院畜牧兽医研究所;新疆阿勒泰市畜牧兽医站;
【基金】：国家自然基金“SARA影响锦江黄牛胃肠道微生物和宿主代谢的关联研究”(31560647)
【分类号】：S823.5

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