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首页> 外文学位 >Impact of Alfalfa hay neutral detergent fiber concentration and digestibility on holstein dairy cow performance, diet digestibility and chewing behavior.
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Impact of Alfalfa hay neutral detergent fiber concentration and digestibility on holstein dairy cow performance, diet digestibility and chewing behavior.

机译：苜蓿干草中性洗涤剂纤维浓度和消化率对荷斯坦奶牛生产性能，日粮消化率和咀嚼行为的影响。

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摘要

Our objectives were to determine the effect of alfalfa hay in vitro neutral detergent fiber digestibility (IVNDFD), compared within relatively low and high neutral detergent fiber (NDF) concentration hay pairs, on Holstein dairy cow performance, apparent digestibility, chewing activity and rumen parameters. Treatments (Lh, Ll, Hh and Hl) included four alfalfa hays selected for low (L) or high (H) NDF concentration and low (l) or high (h) 48-h IVNDFD within NDF concentration pairs. Three studies were conducted. During Study 1 and 2, alfalfa hays were included at 15% of the diet DM. Study 3 was a short-term study (21-d) in which alfalfa hay was fed at 96% of the diet DM. Analysis of alfalfa hay grab samples taken during study 1 confirmed that within the high NDF hays (Hh and Hl) there was no difference in NDF concentration and the Hh hay was 6.8 percentage units higher in IVNDFD compared to Hl. However, within the low NDF hays (Lh and Ll), NDF concentration was 3.8 percentage units higher for the Ll compared to Lh hay and there was no difference in IVNDFD. Therefore, our original study design was not maintained. As a result, we evaluated the impact of alfalfa hay IVNDFD on response variables for the high NDF hay diets and the impact of alfalfa hay NDF concentration on response variables for the low NDF hay diets. When alfalfa hay was fed at 15% of the diet DM, there was no impact of alfalfa hay NDF concentration or IVNDFD on DMI, fat corrected milk (FCM) yield, milk fat, or protein yield among treatments. Within the low NDF hay diets, apparent total tract DM digestibility (DMD) was 6.6 percentage units higher for the Ll compared to the Lh hay diet and there was a trend for higher apparent total tract NDF digestibility (NDFD) for the Ll compared to Lh hay diet. For the high NDF hay diets, a difference in alfalfa hay IVNDFD of 6.8 percentage units did not affect total tract DM or NDF digestibility. Neither alfalfa hay NDF concentration nor IVNDFD affected rumen pH or VFA concentrations. When alfalfa hay was included at 96% of the diet DM, there was no difference in DMI, 3.5% FCM, milk fat or protein yield among treatments. Within the low NDF hay diets, apparent total tract DM and NDF digestibility were 14.7 and 18.4 percentage units higher for the Lh compared to Ll hay diet. In contrast, within the high NDF hay diets, apparent total tract DMD was 11.1 percentage units higher for the Hl compared to Hh hay and there was no difference in apparent total tract NDFD. Our results suggest that small differences in alfalfa hay IVNDFD or NDF concentration, especially when alfalfa hay is fed at a low dietary inclusion level, should not be expected to have a significant impact on dairy cow lactation performance. Given the challenges associated with forage sampling and IVNDFD repeatability, effectively implementing IVNDFD data in diet formulation for dairy cows is difficult.
机译：我们的目标是确定相对较低和较高中性洗涤剂纤维（NDF）浓度的干草对中苜蓿干草的体外中性洗涤剂纤维消化率（IVNDFD）对荷斯坦奶牛性能，表观消化率，咀嚼活性和瘤胃参数的影响。处理（Lh，L1，Hh和H1）包括为低（L）或高（H）NDF浓度以及在NDF浓度对内的低（l）或高（h）48-h IVNDFD选择的四个苜蓿干草。进行了三项研究。在研究1和2中，苜蓿干草的含量为日粮DM的15％。研究3是一项短期研究（21天），其中苜蓿干草的饲喂量为日粮DM的96％。研究1期间采集的苜蓿干草抓取样品的分析证实，在高NDF干草（Hh和H1）内，NDF浓度没有差异，IVNDFD中Hh干草比H1高6.8个百分点。但是，在低NDF干草（Lh和L1）中，L1的NDF浓度比Lh干草高3.8个百分点，IVNDFD没有差异。因此，我们的原始研究设计没有得到维护。结果，我们评估了苜蓿干草IVNDFD对高NDF干草日粮的响应变量的影响以及苜蓿干草NDF浓度对低NDF干草日粮的响应变量的影响。当苜蓿干草以日粮DM的15％喂食时，苜蓿干草NDF浓度或IVNDFD对DMI，脂肪校正乳（FCM）产量，乳脂或蛋白质产量没有影响。在低NDF干草日粮中，Ll的表观总道DM消化率（DMD）比Lh干草日粮高6.6个百分点，并且Ll的表观总道NDF消化率（NDFD）比Lh高。干草饮食。对于高NDF干草日粮，紫花苜蓿干草IVNDFD的差异为6.8个百分点不影响总干物质DM或NDF的消化率。苜蓿干草NDF浓度和IVNDFD均不影响瘤胃pH或VFA浓度。当苜蓿干草含量为日粮DM的96％时，处理之间的DMI，3.5％FCM，乳脂或蛋白质产量没有差异。在低NDF干草饮食中，Lh的表观总干物质DM和NDF消化率比L1干草饮食高14.7和18.4个百分点。相反，在高NDF干草日粮中，H1的表观总道DMD比Hh干草高11.1个百分点，并且表观总道NDFD没有差异。我们的结果表明，苜蓿干草IVNDFD或NDF浓度的细微差别，尤其是饲喂低日粮含量的苜蓿干草时，不应预期会对奶牛的泌乳性能产生重大影响。鉴于饲草采样和IVNDFD可重复性带来的挑战，很难在奶牛的日粮配方中有效实施IVNDFD数据。

著录项

  • 作者

    Raeth-Knight, Mary Louise.;

  • 作者单位

    University of Minnesota.;

  • 授予单位 University of Minnesota.;
  • 学科 Agriculture Animal Culture and Nutrition.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 95 p.
  • 总页数 95
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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