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首页> 外文期刊>Journal of dairy science >Physically effective neutral detergent fiber improves chewing activity, rumen fermentation, plasma metabolites, and milk production in lactating dairy cows fed a high-concentrate diet
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Physically effective neutral detergent fiber improves chewing activity, rumen fermentation, plasma metabolites, and milk production in lactating dairy cows fed a high-concentrate diet

机译：物理有效的中性洗涤剂纤维可提高咀嚼活性，瘤胃发酵，血浆代谢产物和哺乳奶牛的牛奶生产喂养高浓缩饮食

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摘要

Subacute ruminal acidosis (SARA) continues to be a common and costly metabolic disorder in highproducing dairy cows worldwide. The objective of this study was to evaluate if increasing the concentration of physically effective neutral detergent fiber (peNDF) in diets can reduce the risk of SARA in cows fed a highconcentrate diet. Thirty second-parity Holstein cows in mid lactation (131 ± 8.3 d in milk) were randomly allocated to 3 dietary treatments (10 dairy cows per group): high (11.3%, high peNDF8.0), medium (10.6%, medium peNDF8.0), or low (9.0%, low peNDF8.0) concentration of peNDF8.0. The diets were prepared by mixing the same total mixed ration (57% concentrate and 43% roughages) for 10, 18, or 60 min, respectively. The treatments were fed for 36 d with 21 d for adaptation and 15 d for sampling. The peNDF8.0 intake was positively correlated with the peNDF8.0 concentration. Chewing and ruminating times adjusted for dry matter intake and NDF intake were linearly increased with the increased dietary peNDF8.0 concentration. The high peNDF8.0 diet decreased the number of meals per day. The increased dietary peNDF8.0 concentration linearly increased the rumen fluid pH, the molar percentage of acetate and isobutyrate, acetate-to-propionate ratio, and ammonia nitrogen concentration, but linearly decreased the molar percentages of propionate and valerate. The total VFA concentration and the molar percentages of butyrate and isovalerate remained unchanged. Meanwhile, the increase in the peNDF8.0 concentration of the diet linearly increased the activities of carboxymethyl cellulase, avicelase, β-glucanase, and ferulic acid esterase in rumen fluid, but did not affect the activities of xylanase. Total plasma antioxidant capacity, γ-glutamyl transpeptidase activity, and plasma concentrations of total protein, albumin, creatinine, and malondialdehyde were linearly decreased by the increased dietary peNDF8.0 concentration. The increase in peNDF8.0 concentration raised the plasma concentrations of glucose, triglyceride, cholesterol, and blood urea nitrogen. Somatic cell counts in the milk were positively correlated with the dietary peNDF8.0 concentration. The feed and milk energy efficiencies were unaffected by the treatments. Shortening the total mixed ration mixing time may be a practical strategy to increase the peNDF8.0 concentration and reduce the risk of SARA in dairy cows fed high-concentrate diets.
机译：亚急性瘤胃酸中毒（Sara）仍然是全世界高奶牛奶牛的常见和昂贵的代谢紊乱。本研究的目的是评估饮食中物理有效的中性洗涤剂纤维（PENDF）的浓度是否可以降低喂养高档饮食的奶牛的萨拉的风险。中期哺乳期的三十二个阶段荷斯坦奶牛（牛奶中的131±8.3d）被随机分配给3个饮食治疗（每组10奶牛）：高（11.3％，高pendf8.0），中等（10.6％，中等Pendf8 .0），或低（9.0％，低pendf8.0）pendf8.0的浓度。通过分别混合相同的总混合配给（57％浓缩物和43％粗糙度）分别为10,18或60分钟来制备饮食。将处理用21d加入36d，以进行适应和15 d以进行抽样。 pendf8.0摄入量与pendf8.0浓度正相关。随着饮食PendF8.0浓度的增加，调节干物质摄入和NDF摄入量的咀嚼和反刍时间是线性的。高pendf8.0饮食减少了每天膳食数量。增加的膳食Pendf8.0浓度线性地增加了瘤胃流体pH，乙酸盐和异丁酸酯的摩尔百分比，乙酸乙酯 - 丙酸盐比和氨氮浓度，但线性地降低了丙酸盐和戊酸酯的摩尔百分比。丁酸盐的总VFA浓度和摩尔百分比保持不变。同时，Pendf8.0浓度的增加饮食的浓度线性地增加了羧氯酰纤维素酶，百柔氯酶，β-葡聚糖酶和阿魏酸酯酶在瘤胃流体中的活性，但不影响木聚糖酶的活性。总蛋白质，白蛋白，肌酐和丙二醛的总血浆抗氧化物容量，γ-谷氨酸缩肽酶活性和血浆浓度通过增加的膳食PendF8.0浓度线性降低。 PendF8.0浓度的增加提高了葡萄糖，甘油三酯，胆固醇和血尿尿素氮的血浆浓度。牛奶中的体细胞计数与膳食pendf8.0浓度正相关。饲料和牛奶能效率不受治疗的影响。缩短总混合的配给混合时间可能是增加Pendf8.0浓度的实际策略，并降低喂养高浓缩饮食的乳制品奶牛的萨拉风险。

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  • 来源
    《Journal of dairy science》 |2021年第5期|5631-5642|共12页
  • 作者

    Yangchun Cao; Dangdang Wang; Lamei Wang; Xiaoshi Wei; Xiaoyong Li; Chuanjiang Cai; Xinjian Lei; Junhu Yao;

  • 作者单位

    College of Animal Science and Technology Northwest A&F University Yangling Shaanxi 712100 P.R. China;

    College of Animal Science and Technology Northwest A&F University Yangling Shaanxi 712100 P.R. China;

    College of Animal Science and Technology Northwest A&F University Yangling Shaanxi 712100 P.R. China;

    College of Animal Science and Technology Northwest A&F University Yangling Shaanxi 712100 P.R. China;

    College of Animal Science and Technology Northwest A&F University Yangling Shaanxi 712100 P.R. China;

    College of Animal Science and Technology Northwest A&F University Yangling Shaanxi 712100 P.R. China;

    College of Animal Science and Technology Northwest A&F University Yangling Shaanxi 712100 P.R. China;

    College of Animal Science and Technology Northwest A&F University Yangling Shaanxi 712100 P.R. China;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    peNDF; subacute ruminal acidosis; chewing activity; rumen fermentation;

    机译：pendf;亚急性瘤胃酸中毒;咀嚼活动;瘤胃发酵;

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