Feed intake, microbial adherence and fibrolytic activity in residues of forage samples incubated in the rumen of sheep fed grass forages and/or a total mixed ration

A. Pérez-Ruchel, J. L. Repetto, C. Cajarville, M. P. Mezzomo, G. V. Kozloski
{"title":"Feed intake, microbial adherence and fibrolytic activity in residues of forage samples incubated in the rumen of sheep fed grass forages and/or a total mixed ration","authors":"A. Pérez-Ruchel, J. L. Repetto, C. Cajarville, M. P. Mezzomo, G. V. Kozloski","doi":"10.1017/s0021859624000017","DOIUrl":null,"url":null,"abstract":"Three male sheep were fed, throughout three experimental periods, with either only forage, only total mixed ration (TMR) or a mixed diet (TMR + forage). The rich-fibre ingredients of each diet were incubated daily <jats:italic>in situ</jats:italic> for three days and the ruminal pH was measured every 2 h during the last day of each experimental period. Rumen pH decreased at increased proportion of TMR in diet (<jats:italic>P</jats:italic> &lt; 0.05). The dry matter (DM) degradability of the grass forage was higher (<jats:italic>P</jats:italic> &lt; 0.05) in animals receiving only forage than in those receiving the mixed diet whereas the DM degradability of the corn silage was higher (<jats:italic>P</jats:italic> &lt; 0.05) in animals receiving the mixed diet than in those receiving only TMR. The level of microbial adherence in residues of grass forage was higher (<jats:italic>P</jats:italic> &lt; 0.05) in animals fed with only forage than in those fed with the mixed diet and, the level of microbial adherence in residue of corn silage was higher (<jats:italic>P</jats:italic> &lt; 0.05) in animals receiving the mixed diet than in those receiving TMR. The carboxymethylcellulase activity in residues of grass forage was higher (<jats:italic>P</jats:italic> &lt; 0.05) in sheep fed the mixed diet whereas not significant effect of diet type was observed for this variable in residues of corn silage. In conclusion, increased inclusion of TMR in sheep diet showed a negative impact on microbial adherence and forage degradability <jats:italic>in situ</jats:italic>, an effect mediated by changes in rumen pH which was not compensated by increased fibrolytic activity.","PeriodicalId":501199,"journal":{"name":"The Journal of Agricultural Science","volume":"12 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"The Journal of Agricultural Science","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1017/s0021859624000017","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0

Abstract

Three male sheep were fed, throughout three experimental periods, with either only forage, only total mixed ration (TMR) or a mixed diet (TMR + forage). The rich-fibre ingredients of each diet were incubated daily in situ for three days and the ruminal pH was measured every 2 h during the last day of each experimental period. Rumen pH decreased at increased proportion of TMR in diet (P < 0.05). The dry matter (DM) degradability of the grass forage was higher (P < 0.05) in animals receiving only forage than in those receiving the mixed diet whereas the DM degradability of the corn silage was higher (P < 0.05) in animals receiving the mixed diet than in those receiving only TMR. The level of microbial adherence in residues of grass forage was higher (P < 0.05) in animals fed with only forage than in those fed with the mixed diet and, the level of microbial adherence in residue of corn silage was higher (P < 0.05) in animals receiving the mixed diet than in those receiving TMR. The carboxymethylcellulase activity in residues of grass forage was higher (P < 0.05) in sheep fed the mixed diet whereas not significant effect of diet type was observed for this variable in residues of corn silage. In conclusion, increased inclusion of TMR in sheep diet showed a negative impact on microbial adherence and forage degradability in situ, an effect mediated by changes in rumen pH which was not compensated by increased fibrolytic activity.
饲喂青草饲料和/或全混合日粮的绵羊瘤胃中饲草样品残留物的采食量、微生物附着力和纤维分解活性
三只雄羊在三个实验期内分别饲喂饲料、全混日粮(TMR)或混合日粮(TMR + 饲料)。每种日粮中的富纤维成分每天在原地培养三天,在每个实验期的最后一天,每隔 2 小时测量一次瘤胃 pH 值。日粮中 TMR 比例增加时,瘤胃 pH 值下降(P < 0.05)。混合日粮动物的干物质(DM)降解率(P <0.05)高于仅饲喂饲草的动物,而混合日粮动物的玉米青贮饲料(DM)降解率(P <0.05)高于仅饲喂 TMR 的动物。只饲喂饲草的动物比饲喂混合日粮的动物残留物中的微生物附着水平更高(P <0.05),而饲喂混合日粮的动物比饲喂 TMR 的动物残留物中的微生物附着水平更高(P <0.05)。饲喂混合日粮的绵羊残留草料中的羧甲基纤维素酶活性更高(P < 0.05),而饲喂玉米青贮残留物的绵羊残留草料中的羧甲基纤维素酶活性受日粮类型的影响不大。总之,在绵羊日粮中添加更多的 TMR 对微生物的附着性和饲草的就地降解性有负面影响,这种影响由瘤胃 pH 值的变化介导,而纤维分解活性的增加并不能补偿这种影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
自引率
0.00%
发文量
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信