动物营养学报 >

2020 , Vol. 32 >Issue 1: 224 - 233

DOI: https://doi.org/10.3969/j.issn.1006-267x.2020.01.028

反刍与草食动物营养与饲料 RUMINANT AND HERBIVORE NUTRITION AND FEED

绵羊瘤胃乙酸﹑丁酸产生量的提高对其消化道吸收和流通的影响

  • 杜瑞平 ,
  • 卢德勋 ,
  • 高民
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  • 内蒙古自治区农牧业科学院动物营养与饲料研究所, 呼和浩特 010031
杜瑞平(1979-),女,内蒙古包头人,副研究员,博士,研究方向为反刍动物营养调控理论与技术。E-mail:duruiping1989@163.com

收稿日期: 2019-07-17

  网络出版日期: 2020-01-19

基金资助

内蒙古自治区"十五"科技重大专项"草地发展与草地合理利用关键技术集成研究与产业化示范专项——禁牧舍饲条件下不同类型区的牛羊饲草料营养供给技术集成研究与示范"（20010117）

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Effects of Increasing Ruminal Acetate and Butyrate Production Rate on Gastrointestinal Passage and Absorption in Sheep

  • DU Ruiping ,
  • LU Dexun ,
  • GAO Min
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  • Animal Nutrition Institute of Agriculture and Animal Husbandry Academy of Inner Mongolia, Huhhot 010031, China

Received date: 2019-07-17

  Online published: 2020-01-19

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摘要

本试验旨在研究基础饲粮条件下绵羊瘤胃乙酸、丁酸产生量的提高对其消化道吸收流通的影响。选用体况良好、1.5岁左右、体重相近的安装有永久性瘤胃瘘管和近端十二指肠瘘管的内蒙古半细毛羯羊6只，随机分为2组，每组3只，一组为乙酸灌注组，另一组为丁酸灌注组。每组设置3个处理，每个处理代表1个灌注的乙酸﹑丁酸水平及1次启动-连续灌注试验。试验通过模拟连续饲喂从而获得瘤胃稳态条件，采用非同位素标记乙酸、丁酸溶液灌注技术进行测定。结果表明：1）随着瘤胃乙酸产生速率的提高，瘤胃pH、瘤胃乙酸吸收率显著下降（P<0.05），瘤胃乙酸浓度、乙酸吸收速率和乙酸流通速率极显著上升（P<0.01），瘤胃液相钴（Co）浓度、瘤胃液相小时稀释速率、液相流通速率和液相体积均无显著变化（P>0.05）；瘤胃丁酸产生速率的提高除了对瘤胃液相Co浓度也影响显著（P<0.05）外，对其他指标影响同乙酸处理的变化。2）随着瘤胃乙酸产生速率的提高，各试验羊乙酸十二指肠流通速率逐渐增加（2.95~3.47 mmol/h），但各水平间差异不显著（P>0.05）；进入十二指肠的乙酸占进入后消化道总乙酸的比例（5.68%~3.35%）极显著下降（P<0.01）；乙酸在瓣胃﹑真胃的吸收比例（94.32%~96.65%）极显著上升（P<0.01）。本研究条件下，绵羊瘤胃乙酸、丁酸产生速率的增加提高了其瘤胃浓度，降低了瘤胃pH，提高了其瘤胃吸收速率和瘤胃、十二指肠流通速率，但瘤胃吸收效率下降。

关键词： 绵羊; 瘤胃; 乙酸; 丁酸; 产生; 吸收; 流通

本文引用格式

杜瑞平 , 卢德勋 , 高民 . 绵羊瘤胃乙酸﹑丁酸产生量的提高对其消化道吸收和流通的影响[J]. 动物营养学报, 2020 , 32(1) : 224 -233 . DOI: 10.3969/j.issn.1006-267x.2020.01.028

Abstract

This experiment was conducted to study the effects of increasing production rate of ruminal acetate and butyrate on their gastrointestinal absorption and passage. Six healthy Inner Mongolian semifine-wool wethers (1.5-old-year, similar body weight) fitted with a ruminal and a duodenum cannula were randomly divided into two groups (acetate infusion group and butyrate infusion group) with three sheep in each group. Each group set 3 treatments, each treatment was an infusion level of acetate/butyrate and a pulse-continuous infusion experiment. Rumen steady state was obtained by simulating continuous feeding, and non-isotope labeled acetate and butyrate solutions technology was used. The results showed as follows:1) ruminal pH and acetate fractional absorption rate decreased significantly (P<0.05) and ruminal acetate concentration, acetate absorption rate and acetate passage rate increased significantly (P<0.01) with increasing ruminal acetate production rate. Meanwhile, ruminal Co concentration, ruminal liquid hour dilution rate, ruminal liquid flow rate and liquid volume changed insignificantly with increasing ruminal acetate production rate (P>0.05). Except ruminal Co concentration decreased significantly (P<0.05) with increasing ruminal butyrate production rate, other indexes change were as the same as acetate infusion. 2) Acetate duodenum passage rate increased insignificantly (2.95 to 3.47 mmol/h) with increasing ruminal acetate production rate (P>0.05), the percentage of duodenum acetate entering hind-tract (5.68% to 3.35%) and acetate absorption percentage in the omasum and abomasum (94.32% to 96.65%) increased significantly (P<0.01) with increasing ruminal acetate production rate. In this study, increasing ruminal acetate and butyrate production rate in sheep increase ruminal concentration of acetate and butyrate, decrease ruminal pH, increase ruminal absorption rate of acetate and butyrate and passage rate in rumen and duodenum, and decrease ruminal absorption efficiency of acetate and butyrate.

Key words： sheep; rumen; acetate; butyrate; production; absorption; passage

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