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Using Live Microorganisms to Modulate Ruminal Fermentation- [electronic resource]
![Using Live Microorganisms to Modulate Ruminal Fermentation - [electronic resource]](/Users/Baul/Images/book.png)
Using Live Microorganisms to Modulate Ruminal Fermentation- [electronic resource]
상세정보
- 자료유형
- 학위논문파일 국외
- 최종처리일시
- 20240214095837
- ISBN
- 9798379744984
- DDC
- 636
- 서명/저자
- Using Live Microorganisms to Modulate Ruminal Fermentation - [electronic resource]
- 발행사항
- [S.l.]: : University of Florida., 2021
- 발행사항
- Ann Arbor : : ProQuest Dissertations & Theses,, 2021
- 형태사항
- 1 online resource(177 p.)
- 주기사항
- Source: Dissertations Abstracts International, Volume: 84-12, Section: B.
- 주기사항
- Advisor: Faciola, Antonio.
- 학위논문주기
- Thesis (Ph.D.)--University of Florida, 2021.
- 사용제한주기
- This item must not be sold to any third party vendors.
- 초록/해제
- 요약Live microorganisms have been used as feed additives to cattle in order to strategically change the ruminal microbial community dynamics, thus, improving ruminal fermentation and animal performance. The objective of this dissertation was to evaluate different situations that live microorganisms could be used in order to modulate ruminal fermentation. The focus of this work was on ruminal fermentation; therefore, different experimental models were used to understand the mechanism of action of the microorganisms used across studies.In chapter 2, the goal was to evaluate how silage treated with lactic acid bacteria (LAB; Lactobacillus plantarum MTD/1) inoculants could improve ruminal fermentation and milk production in high-producing dairy cows. Dry matter intake, nutrient digestibility, and milk production increased in cows receiveing the treated silage, despite of minor changes in energy-corrected milk (ECM). The increase in ruminal nutrient digestibility were not followed by improvements in ruminal N metabolism, which may explain the lack of responses in ECM.In chapters 3 and 4, the LAB L. plantarum GB-LP1 was tested as direct fed microbials (DFM) on ruminal fermentation of high-producing dairy cow diets. In a series of in vitro studies, the inclusion rate in the diet and the mode of action of the LAB of focus was investigated in comparison with a mix of LAB and lactic acid utilizing bacteria (MLP). All DFM tested in the study improved ruminal N metabolism by negatively affecting some fibrolytic bacterial genera that may dispose proteolytic activity; changes were mostly associated to the fluid phase.In chapter 5, the focus of the study was to create an acute ruminal acidosis scenario in vitro by using a dual-flow continuous culture system, and to feed a mix of lactic acid utilizing bacteria and yeast as DFM in order to ameliorate acidosis. Yeast was tested in this study in combinations with two new strains of Megasphaera eldesnii isolated from the rumen of acidotically challenged beef cattle. Acute ruminal acidosis was successfully induced in vitro; however, the DFM in the study were not able to reduce the acid load or improve ruminal fermentation. Therefore, in chapter 6, a literature review about ruminal acidosis is presented in order to investigate potential factors besides the acid load in the rumen that could explain the ruminal problems seen from this digestive disorder.
- 일반주제명
- Animal sciences.
- 일반주제명
- Microbiology.
- 일반주제명
- Agriculture.
- 키워드
- Beef-cattle
- 키워드
- Dairy-cow
- 키워드
- Rumen
- 기타저자
- University of Florida Animal Sciences
- 기본자료저록
- Dissertations Abstracts International. 84-12B.
- 기본자료저록
- Dissertation Abstract International
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520240214095837
■006m o d
■007cr#unu||||||||
■020 ▼a9798379744984
■035 ▼a(MiAaPQ)AAI28412441
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a636
■1001 ▼aMonteiro, Hugo Fernando.
■24510▼aUsing Live Microorganisms to Modulate Ruminal Fermentation▼h[electronic resource]
■260 ▼a[S.l.]:▼bUniversity of Florida. ▼c2021
■260 1▼aAnn Arbor :▼bProQuest Dissertations & Theses, ▼c2021
■300 ▼a1 online resource(177 p.)
■500 ▼aSource: Dissertations Abstracts International, Volume: 84-12, Section: B.
■500 ▼aAdvisor: Faciola, Antonio.
■5021 ▼aThesis (Ph.D.)--University of Florida, 2021.
■506 ▼aThis item must not be sold to any third party vendors.
■520 ▼aLive microorganisms have been used as feed additives to cattle in order to strategically change the ruminal microbial community dynamics, thus, improving ruminal fermentation and animal performance. The objective of this dissertation was to evaluate different situations that live microorganisms could be used in order to modulate ruminal fermentation. The focus of this work was on ruminal fermentation; therefore, different experimental models were used to understand the mechanism of action of the microorganisms used across studies.In chapter 2, the goal was to evaluate how silage treated with lactic acid bacteria (LAB; Lactobacillus plantarum MTD/1) inoculants could improve ruminal fermentation and milk production in high-producing dairy cows. Dry matter intake, nutrient digestibility, and milk production increased in cows receiveing the treated silage, despite of minor changes in energy-corrected milk (ECM). The increase in ruminal nutrient digestibility were not followed by improvements in ruminal N metabolism, which may explain the lack of responses in ECM.In chapters 3 and 4, the LAB L. plantarum GB-LP1 was tested as direct fed microbials (DFM) on ruminal fermentation of high-producing dairy cow diets. In a series of in vitro studies, the inclusion rate in the diet and the mode of action of the LAB of focus was investigated in comparison with a mix of LAB and lactic acid utilizing bacteria (MLP). All DFM tested in the study improved ruminal N metabolism by negatively affecting some fibrolytic bacterial genera that may dispose proteolytic activity; changes were mostly associated to the fluid phase.In chapter 5, the focus of the study was to create an acute ruminal acidosis scenario in vitro by using a dual-flow continuous culture system, and to feed a mix of lactic acid utilizing bacteria and yeast as DFM in order to ameliorate acidosis. Yeast was tested in this study in combinations with two new strains of Megasphaera eldesnii isolated from the rumen of acidotically challenged beef cattle. Acute ruminal acidosis was successfully induced in vitro; however, the DFM in the study were not able to reduce the acid load or improve ruminal fermentation. Therefore, in chapter 6, a literature review about ruminal acidosis is presented in order to investigate potential factors besides the acid load in the rumen that could explain the ruminal problems seen from this digestive disorder.
■590 ▼aSchool code: 0070.
■650 4▼aAnimal sciences.
■650 4▼aMicrobiology.
■650 4▼aAgriculture.
■653 ▼aBeef-cattle
■653 ▼aDairy-cow
■653 ▼aLactobacillus-plantarum
■653 ▼aMegasphaera-elsdenii
■653 ▼aRumen
■653 ▼aSaccharomyces-cerevisiae
■690 ▼a0475
■690 ▼a0410
■690 ▼a0473
■71020▼aUniversity of Florida▼bAnimal Sciences.
■7730 ▼tDissertations Abstracts International▼g84-12B.
■773 ▼tDissertation Abstract International
■790 ▼a0070
■791 ▼aPh.D.
■792 ▼a2021
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T16930933▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
■980 ▼a202402▼f2024
