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Effect of Forage Quality on Methane Production and Ruminal Fermentation Characteristics of Cattle
조사료 품질이 반추가축 메탄 발생량과 반추위 발효 특성에 미치는 영향

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dc.contributor.advisor김경훈-
dc.contributor.author우양원-
dc.date.accessioned2018-05-29T03:44:43Z-
dc.date.available2018-05-29T03:44:43Z-
dc.date.issued2018-02-
dc.identifier.other000000150695-
dc.identifier.urihttps://hdl.handle.net/10371/141676-
dc.description학위논문 (석사)-- 서울대학교 대학원 : 국제농업기술대학원 국제농업기술학과, 2018. 2. 김경훈.-
dc.description.abstractThe purpose of two experiments was to determine CH4 production and ruminal characteristics of different quality forages fed to cattle. In experiment 1, four Holstein Friesian steers (initial body weight, 237 ± 31 kg) were used in a duplicated 2 x 2 Latin square design. Cattle were fed either timothy hay (Ti) ad libitum or rice straw hay (RS) ad libitum. The average daily OM, NDF and CP intakes (kg DM) for cattle fed Ti were 105 (P = 0.001), 102 (P = 0.002) and 221% (P = 0.001) higher than for cattle fed RS, respectively. Apparent OM and NDF digestibility were not different significantly between forages. Cattle fed Ti produced 85% more CH4 (g/d) than cattle fed RS (54.6 and 29.5, respectively-
dc.description.abstractP = 0.081). When CH4 was eressed as per kg DMI and OMI, there were no significances between diets, however, cattle fed RS emitted significantly more CH4 than Ti, based on kg digested OMI (dOMI) (P = <0.0001) and digested NDFI (dDNFI) (P = 0.004). Total VFAs of cattle fed two forages were not different, but propionate proportion of VFA was significantly higher (P <.0001) for cattle fed RS, followed by lowered C2/C3 ratio (P = 0.000). Higher NH3-N concentration was observed (P = 0.002) in rumen fluid of cattle fed Ti than RS.
In experiment 2, four Hanwoo (Korean native beef cattle) steers (initial body weight, 374 ± 40 kg) were used in a duplicated 2 x 2 Latin square design. Cattle were fed either lacerated RG hay ad libitum plus 3.2 kg of concentrate/d as fed basis or lacerated Italian ryegrass silage (IRG-s) ad libitum plus 3.2 kg of concentrate/d as fed basis. The average daily OM, NDF and CP intakes for cattle fed IRG-s were 10% (P = 0.086), 18% (P = 0.059) and 31% (P = 0.038) higher than for cattle fed RS, respectively. Indirect estimates of apparent OM and NDF digestibility of IRG-s (67.4 and 63.5%, respectively) were higher (P = 0.009) than those of RS (61.4 and 55.7%, respectively). Daily CH4 production and per kg DMI, OMI and dOMI for cattle fed IRG-s were not significantly different compared to cattle fed RS. Methane production per kg dNDFI for cattle fed RS showed higher trend (P = 0.071) than that for cattle fed IRG-s. Acetate proportion of total VFA was significantly higher (P = 0.000) for cattle fed IRG-s, while butyrate proportion was significantly higher (P <.0001) for cattle fed RS. However, there was no differences in total VFA and C2/C3 between treatments. Proportions of isobutyrate and isovalerate were higher (P = 0.003 and P = 0.012, respectively) for cattle fed IRG-s than RS. We concluded that, when there is enough quality difference between forages, high quality forage is expected to have methane mitigation potential in the aspect of dOMI or dNDFI.
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dc.description.tableofcontents1. Introduction 1
2. Literature Review 3
2.1. Necessity of methane mitigation from ruminants in the productivity and environmental aspects 3
2.2. Factors affecting the forage quality 3
2.3. Relations between forage IVDMD (or IVOMD) and in vitro gas characteristics 4
2.3.1. Total gas production 4
2.3.2. CH4 production per DM incubated 5
2.3.3. CH4 production per digested DM 5
2.3.4. Relationship between forage quality and ruminal fermentation 6
2.4. Relations between forage quality and in vivo methane production 7
2.4.1. General relationship between DMI and CH4 production 7
2.4.2. Relationship between DMI and CH4 production with respect to forage quality 7
2.4.3. Relationship between digested OMI (or DMI) and CH4 production with respect to forage quality 8
2.5. Forage quality and CH4 mitigation strategy 8
3. Materials and Methods 10
3.1. Animals and Experimental Design 10
3.2. Experimental Diets and Feeding 11
3.3. Methane Emissions Measurement 13
3.4. Digestion Trial and Rumen Sampling 14
3.5. Chemical Analysis 15
3.6. Statistical Analysis 15
4. Results and Discussions 16
4.1. Experiment 1. Rice straw hay vs. Timothy hay 16
4.1.1. Chemical composition of diets 16
4.1.2. Nutrient intake and digestibility 18
4.1.3. Methane production from enteric fermentation 21
4.1.4. Ruminal fermentation characteristics 23
4.1.5. Conclusion of Exp. 1 24
4.2. Experiment 2. Rice straw hay vs. Italian ryegrass silage 28
4.2.1. Chemical composition of diets 28
4.2.2. Nutrient intake and digestibility 30
4.2.3. Methane production from enteric fermentation 33
4.2.4. Ruminal fermentation characteristics 35
4.2.5. Conclusion of Exp. 2 39
5. Conclusion 39
6. Bibliography 40
7. Abstract in Korean 47
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dc.formatapplication/pdf-
dc.format.extent753076 bytes-
dc.format.mediumapplication/pdf-
dc.language.isoen-
dc.publisher서울대학교 대학원-
dc.subjectforage quality-
dc.subjectItalian ryegrass-
dc.subjectmethane-
dc.subjectrice straw-
dc.subjectruminal fermentation-
dc.subjecttimothy-
dc.subject.ddc631-
dc.titleEffect of Forage Quality on Methane Production and Ruminal Fermentation Characteristics of Cattle-
dc.title.alternative조사료 품질이 반추가축 메탄 발생량과 반추위 발효 특성에 미치는 영향-
dc.typeThesis-
dc.contributor.AlternativeAuthorYang Won Woo-
dc.description.degreeMaster-
dc.contributor.affiliation국제농업기술대학원 국제농업기술학과-
dc.date.awarded2018-02-
Appears in Collections:
Graduate School of International Agricultural Technology (국제농업기술대학원)Dept. of International Agricultural Technology (국제농업기술학과)Theses (Master's Degree_국제농업기술학과)
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