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Effect of Low Protein Levels with L-Valine Supplemented in Weaning Diet on Growth Performance, Fecal Score, Blood Profiles, Nutrients Digestibility, Carcass Characteristics and Economic Analysis in Weaning to Finishing Pigs : 자돈 사료 내 단백질 수준과 발린의 첨가가 자돈 및 육성비육돈의 성장성적, 분변지수, 혈액성상, 영양소 소화율, 도체특성 및 경제성에 미치는 영향

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dc.contributor.advisor김유용-
dc.contributor.author한영걸-
dc.date.accessioned2018-05-29T03:53:22Z-
dc.date.available2018-05-29T03:53:22Z-
dc.date.issued2018-02-
dc.identifier.other000000151524-
dc.identifier.urihttps://hdl.handle.net/10371/141761-
dc.description학위논문 (석사)-- 서울대학교 대학원 : 농업생명과학대학 농생명공학부, 2018. 2. 김유용.-
dc.description.abstractSupplying adequate nutrients to livestock not only can lower production costs, but also reduce the economic losses and environmental burdens caused by excess nutrients. The Korea government has enacted laws to regulate environmental pollution resulted by livestock manure. In this context, NRC (2012) revised and adjusted the protein requirement to a lower level compared to previous NRC requirement (1998). However, there is a lack of verification that it can be applied to the domestic swine industry. So the process of verifying whether changes in the protein requirements suggested by the NRC (2012) is indeed appropriate for domestic situation is needed. Therefore, this study was conducted to evaluate optimal crude protein levels with L-valine supplementation in weaning pig diet considering subsequent growth performance, fecal score, blood profiles, nutrient digestibility, carcass characteristics and economic analysis from weaning to finishing pigs. A total of 160 weaning pigs ([Yorkshire×Landrace]×Duroc), with an average body weight of 7.86±1.05kg, were used for 22 weeks feeding trial. Pigs were allotted into one of five treatments by body weight and sex in 4 replicates with 8 pigs per pen in a randomized complete block (RCB) design. The treatments were included 1) Corn-SBM based diet with L-valine supplementation + protein content suggested by NRC (1998) (HP), 2) Basal diet + protein content suggested by NRC (1998) - 1% (MHP), 3) Basal diet + protein content suggested by NRC (1998) - 1.5%, 4) Basal diet + protein content suggested by NRC (2012) and 5) Corn-SBM based diet without L-valine supplementation + protein content suggested by NRC (2012). In feeding trial, reducing crude protein (CP) level showed negative effect on body weight (BW) and average daily gain (ADG) during early growing phase (P<0.01). However, there was no significant impact of reducing CP level on BW and ADG at the end of experiment. Also, average daily feed intake (ADFI) decreased as dietary CP level decreased in 7-10 week (linear, P<0.05). On the other hand, L-valine supplementation in weaning diet increased BW in 22 week, ADG in 7-14 week and ADFI 11-14 week (P<0.01, P<0.01 and P<0.05, respectively). There was no significant difference in fecal score, but fecal consistency tended to decrease as dietary CP level decreased (linear, P<0.10). Likewise L-valine supplementation in weaning diet had no significant effect on fecal score. In blood analysis, there was a positive effect of reducing CP level and L-valine supplementation in weaning diet on BUN concentration in both weaning and growing-finishing period (P<0.01-
dc.description.abstractlinear, P<0.05). Nutrient digestibility and nitrogen balance was not affected by dietary treatments. In carcass characteristics, pH and water holding capacity (WHC) were decreased linearly as dietary CP level decreased (linear, P<0.05). However, crude fat, Hunter L* and b* value showed linear response as dietary CP level decreased (linear, P<0.05). The fatty acid composition of longissimus muscle was changed by feeding CP diet leading to increased MUFA concentration (linear, P<0.05). When pigs were fed low CP diet, feed cost per weight gain, total feed cost and days to market weight were diminished compared to higher CP treatment groups (P<0.05). Moreover, L-valine supplementation resulted in improving days to market weight. Consequently, lowering dietary CP level did not show any detrimental impact on growth performance and increase amino acids availability, crude fat content and MUFA concentration in muscle. Moreover, decreased dietary CP level reduce BUN concentration, feed cost per weight gain, total feed cost, pH and WHC in muscle. On the other hand, supplementation of L-valine in weaning diet resulted in improved growth performance, BUN concentration and numerically decreased days to market weight during growing and finishing period. Although much lower CP level diet was provided during weaning period compared to NRC (1998), there was no detrimental effect on the whole growth performance of pigs. When pigs were fed lowered dietary CP treatment diet, it is desirable to consider supplementing L-valine in weaning pigs diet.-
dc.description.tableofcontentsⅠ. General Introduction 1
Ⅱ. Literature Review
1. Introduction 3
1.1. Genetic improvement and nutrient requirement for pigs 3
1.2. Scale of livestock industry and Situation of environmental regulation in Korea 6
2. Protein and amino acid requirements for swine diets 8
2.1. Transition of protein and amino acid requirements in NRC 8
2.2. Transition of ideal amino acid profile 9
2.3. Valine deficiency of low protein diet in weaning period 11
3. Impact of low protein diet on gastrointestinal tract 12
3.1. Protein fermentation 12
3.2. Microbial population 13
4. Influence of low protein diets on fat deposition 15
4.1. Impact of low protein diet on lipid metabolism 15
4.2. Change of fatty acid profile and pork quality 18
5. Environmental impacts of low protein in diets 19


Ⅲ. Effect of Low Protein Levels with L-Valine Supplemented in Weaning Diet on Growth Performance, Fecal Score, Blood Profiles, Nutrients Digestibility and Carcass Characteristics in Weaning to Finishing Pigs 21
Abstract 21
Introduction 24
Materials and Methods 26
Results and Discussion 33
Conclusion 45
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dc.formatapplication/pdf-
dc.format.extent921611 bytes-
dc.format.mediumapplication/pdf-
dc.language.isoen-
dc.publisher서울대학교 대학원-
dc.subjectProtein level-
dc.subjectNitrogen excretion-
dc.subjectCarcass characteristics-
dc.subjectGrowth performance-
dc.subjectWeaning to finishing pig-
dc.subject.ddc630-
dc.titleEffect of Low Protein Levels with L-Valine Supplemented in Weaning Diet on Growth Performance, Fecal Score, Blood Profiles, Nutrients Digestibility, Carcass Characteristics and Economic Analysis in Weaning to Finishing Pigs-
dc.title.alternative자돈 사료 내 단백질 수준과 발린의 첨가가 자돈 및 육성비육돈의 성장성적, 분변지수, 혈액성상, 영양소 소화율, 도체특성 및 경제성에 미치는 영향-
dc.typeThesis-
dc.contributor.AlternativeAuthorHan Young Geol-
dc.description.degreeMaster-
dc.contributor.affiliation농업생명과학대학 농생명공학부-
dc.date.awarded2018-02-
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