Korean Journal of Poultry Science最新文献_第7页

Production Traits and Stress Responses of Five Korean Native Chicken Breeds 5个韩国地方鸡品种的生产性状及应激反应

Korean Journal of Poultry Science Pub Date : 2020-06-01 DOI: 10.5536/kjps.2020.47.2.95

E. Cho, E. Choi, Hyeon Cheol Jeong, B. Kim, S. Sohn

{"title":"Production Traits and Stress Responses of Five Korean Native\u0000 Chicken Breeds","authors":"E. Cho, E. Choi, Hyeon Cheol Jeong, B. Kim, S. Sohn","doi":"10.5536/kjps.2020.47.2.95","DOIUrl":"https://doi.org/10.5536/kjps.2020.47.2.95","url":null,"abstract":"This study presents the production characteristics and physiological characteristics of five Korean native chicken (KNC) breeds consisting of Hwanggalsaek Jaeraejong (HJ), Korean Rhode Island Red (KR), Korean White Leghorn (KL), Korean Brown Cornish (KC), and Korean Ogye (KO). We investigated their production performances, vitalities, and stress responses. We measured the survival rate, body weight, age at first egg-laying, hen-day egg production, egg weight, amount of telomeric DNA, heterophil-lymphocyte ratio (H/L ratio), and heat shock protein (HSP)-70, HSP-90α and HSP-90β gene expression levels for 493 KNCs. The survival rate was highest in KR, and lowest in KO. Body weights were steadily high in the order of KC, KR, HJ, KO and KL. Average hen-day egg production was highest in KL, and lowest in KC. While the amount of telomeric DNA was highest in KR, and lowest in KC. Furthermore, both the H/L ratio and the HSP-90β gene expression level were highest in KC, and lowest in KR. These results indicated that the KR breed was highly resistant to stress, whereas KC was more susceptible to stress. Taken together, it is considered that with improvements the KC breed would be more suited to be used as a Korean broiler breed while KL would be more appropriately used as a Korean layer breed. In addition, it is considered that the KR breed is appropriate to be used as a maternal chicken breeder based on good production capacity and excellent robustness, while the HJ breed is desirable to be improved as a high-quality Korean meat breed based on its excellent meat quality. (","PeriodicalId":17845,"journal":{"name":"Korean Journal of Poultry Science","volume":"65 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82093261","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Effect of Diet Supplementation with Pine Cone Extracts on Growth Performance, Digestive Organ Characteristics and Cecal Microbiota of Semi-broiler 日粮中添加松果提取物对半肉鸡生长性能、消化器官特征和盲肠菌群的影响

Korean Journal of Poultry Science Pub Date : 2019-12-01 DOI: 10.5536/kjps.2019.46.4.305

J. Pak, Che-Bin Mun, S. Kang

{"title":"Effect of Diet Supplementation with Pine Cone Extracts on Growth\u0000 Performance, Digestive Organ Characteristics and Cecal Microbiota of\u0000 Semi-broiler","authors":"J. Pak, Che-Bin Mun, S. Kang","doi":"10.5536/kjps.2019.46.4.305","DOIUrl":"https://doi.org/10.5536/kjps.2019.46.4.305","url":null,"abstract":"This study investigated the effect of diet supplementation with pine cone extracts (pine cone ethanol extract: PCEE; pine cone ethanol-hexane extract: PCEHE) on growth performance, digestive organ characteristics and intestinal microbiota of semi-broiler. Twenty two-weeks-old semi-broilers were divided into four dietary groups (n=5/group; control(—): no antibiotics and pine cone extracts; control(+): 2% antibiotics [20 g/kg basal diet]; PCEE: 2% PCEE [20 g/kg basal diet]; PCEHE: 2% PCEHE [20 g/kg basal diet]). Chicks were reared and their diets were supplemented accordingly for 16 days. Final weight, weight gain and feed intake were lowest (P<0.05) in semi-broilers whose diet was supplemented with pine cone extracts, but both PCEE and PCEHE groups showed lower (P<0.05) feed conversion ratios compared to the control(—) group. Gizzard and small intestinal weight were also lower (P<0.05) in both PCEE and PCEHE groups than in the control(—) group. Intestinal length and villus height were similar for all treatments. Furthermore, cecal microbiota was not improved by PCEE and PCEHE supplementation. These findings suggest that diet supplementation with pine cone extracts improves the feed conversion ratio and affects the digestive organ weight of semi-broilers. (","PeriodicalId":17845,"journal":{"name":"Korean Journal of Poultry Science","volume":"38 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74333392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparison of Mycoplasma Prevalence and Protection Rate of Low Pathogenic Avian Influenza between Traditional Cage and Animal Welfare Systems 传统笼养系统与动物福利系统对低致病性禽流感支原体患病率及防护率的比较

Korean Journal of Poultry Science Pub Date : 2019-12-01 DOI: 10.5536/kjps.2019.46.4.271

Deok-Hwan Kim, Kyu-Jik Kim, Chang-Seon Song

{"title":"Comparison of Mycoplasma Prevalence and Protection Rate of Low\u0000 Pathogenic Avian Influenza between Traditional Cage and Animal Welfare\u0000 Systems","authors":"Deok-Hwan Kim, Kyu-Jik Kim, Chang-Seon Song","doi":"10.5536/kjps.2019.46.4.271","DOIUrl":"https://doi.org/10.5536/kjps.2019.46.4.271","url":null,"abstract":"In recent years, consumers have recognized the issue of and expressed concern over farm animal welfare. Therefore, worldwide, chicken farms are transitioning from traditional caged breeding systems to welfare-oriented breeding systems. In this study, we further analyzed and compared the prevalence and protection rate of various diseases by challenging chickens under conventional and welfare-oriented breeding conditions with low pathogenic avian influenza. Ten chickens were randomly selected from each farm (conventional and welfare) from which Mycoplasma gallisepticum (MG) and Mycoplasma synoviae (MS) were identified and isolated. Additionally, low pathogenic avian influenza (LPAI) were challenged to broilers from each farm and samples were collected from these chickens using oral and cloacal swabs to investigate viral shedding and titer. The results showed that Mycoplasma infection did not significantly differ between breeding systems. Initially, LPAI viral shedding and titer significantly differed between breeding systems post-challenge, but as the experiment progressed, there was ultimately no significant difference. (","PeriodicalId":17845,"journal":{"name":"Korean Journal of Poultry Science","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73731292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Influence of Stocking Density with Different Light System on the Growth Performance and Behavior in Broiler Chickens 不同光照系统下饲养密度对肉鸡生长性能和行为的影响

Korean Journal of Poultry Science Pub Date : 2019-12-01 DOI: 10.5536/kjps.2019.46.4.297

C. Lim, M. Rana, I. B. Choi, K. Ryu

{"title":"Influence of Stocking Density with Different Light System on the\u0000 Growth Performance and Behavior in Broiler Chickens","authors":"C. Lim, M. Rana, I. B. Choi, K. Ryu","doi":"10.5536/kjps.2019.46.4.297","DOIUrl":"https://doi.org/10.5536/kjps.2019.46.4.297","url":null,"abstract":"This study evaluated the effects of stocking density on performance and behavioral activities of 35-day-old broilers in relation to incandescent white bulb (IB) light and LED yellow and white light. A total of 1,650 day-old chicks were weighed and randomly allocated into six treatment groups in a 2 × 3 factorial arrangement based on stocking density (14 birds m and 22 birds m) and color of lights (IB; monochromatic LED yellow and white light) with five replicates for each treatment. The results showed that final body weight, weight gain and feed conversion of broilers were improved at a stocking density of 14 birds m with exposure to LED lights. Similarly, broilers spent more time exhibiting inactive behavior (e.g. standing) and active behaviors (e.g. walking and walking plus pecking) under 14 birds m with exposure to lights as compared that of other treatment groups. Regarding a stocking density of 22 birds m, broilers performance traits were negatively affected and also activities were less. The performance of broilers was not significantly altered for the main factor of different lights but broilers were less inactive (e.g less time spent sitting plus standing) and more time spent active behavior in walking under IB light than LED light. Thus, we concluded that a stocking density 14 birds m with exposure to LED light significantly improved broiler performance and behavioral activity and these conditions could therefore improve the overall welfare of farmed chickens. (","PeriodicalId":17845,"journal":{"name":"Korean Journal of Poultry Science","volume":"203 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74783701","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Development of Samgyetang Broth from Air-dried and Oven-roasted Chicken Feet 风干烤鸡爪参鸡汤的研制

Korean Journal of Poultry Science Pub Date : 2019-09-01 DOI: 10.5536/kjps.2019.46.3.137

Juntae Kim, D. Utama, H. Jeong, Barido Farouq Heidar, A. Jang, J. Pak, Yeong-Jong Kim, S. Lee

{"title":"Development of Samgyetang Broth from Air-dried and\u0000 Oven-roasted Chicken Feet","authors":"Juntae Kim, D. Utama, H. Jeong, Barido Farouq Heidar, A. Jang, J. Pak, Yeong-Jong Kim, S. Lee","doi":"10.5536/kjps.2019.46.3.137","DOIUrl":"https://doi.org/10.5536/kjps.2019.46.3.137","url":null,"abstract":"This study was conducted to develop and compare Samgyetang broth from extract of pre-treated chicken feet. Chicken feet were subjected to non-heating (control), heating at 70°C for 12 h in a hot air dryer, and heating at 180°C for 1 h in an oven. The heat-treated chicken feet were extracted at 121°C for 1 h and 2 h, respectively. The extract was placed in a pouch with whole chicken carcass (470±10 g). The sealed Samgyetang retort was made according to the industrial method. The pH of the extract from preheated chicken feet was lower than that extracted from fresh chicken feet. The Thiobarbituric Acid Reactive Substances (TBARS) value of the preheated chicken feet extract was significantly lower (P<0.05) than that of fresh chicken feet extract, but there were no significant differences among the broths. As the extraction time increased, the pH and TBARS value decreased in the extract (P<0.05) but increased in the broth (P<0.05). According to the sensory evaluation test, the extract from 1 h hot air heating and drying was significantly better in appearance, aroma, and overall preference than the other treatments (P<0.05). The GC-MS results showed that benzaldehyde and benzothiazole, which are widely known to give meat and nuts flavor, were detected in those treatments (P<0.05). The Samgyetang broths prepared from 1 h hot air heating and drying extract were significantly higher in the overall acceptability according to the sensory test (P<0.05). In summary, the quality of retort Samgyetang broth can be improved by adding chicken feet extract which is subjected to heating and drying for 1 h. (","PeriodicalId":17845,"journal":{"name":"Korean Journal of Poultry Science","volume":"52 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72932347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Molecular Characterization and Expression Analysis of Nucleoporin 210 (Nup210) in Chicken 鸡核孔蛋白210 (Nup210)的分子特征及表达分析

Korean Journal of Poultry Science Pub Date : 2019-09-01 DOI: 10.5536/kjps.2019.46.3.185

Marc Ndimukaga, G. Bigirwa, Seokhyung Lee, R. Lee, Jae-Don Oh

{"title":"Molecular Characterization and Expression Analysis of Nucleoporin 210\u0000 (Nup210) in Chicken","authors":"Marc Ndimukaga, G. Bigirwa, Seokhyung Lee, R. Lee, Jae-Don Oh","doi":"10.5536/kjps.2019.46.3.185","DOIUrl":"https://doi.org/10.5536/kjps.2019.46.3.185","url":null,"abstract":"Nucleoporin 210 (Nup210) is associated with several physiological processes including muscle and neural cell differentiation, autoimmune diseases, and peripheral T cell homeostasis. Chicken Nup210 (chNup210) gene was originally identified as one of the differentially expressed genes (DEGs) in the kidney tissues of chicken. To elucidate the role of Nup210 in metabolic disease of chicken, we studied the molecular characteristics of chNup210 and analyzed its gene expression under the stimulation of Toll-like receptor 3 (TLR3) ligands. The Nup210 genomic DNA and amino acid sequences of various species including fowls, fishes, and mammals were retrieved from the Ensemble database and subjected to bioinformatics analyses. The expression of Nup210 from several chicken tissues was probed through qRT-PCR, and chicken fibroblast DF-1 cell line was used to determine the change in expression of chNup210 after stimulation with TLR3 ligand, polyinosinicpolycytidylic acid (poly (I:C)). The chNup210 gene was highly expressed in chicken lung and spleen tissues. Although highly conserved among the species, chNup210 was evolutionary clustered in the same clade as that of duck compared to other mammals. Furthermore, this study revealed that chNup210 is expressed in TLR3 signaling pathway and provides fundamental information on Nup210 expression in chicken. Future studies that offer insight into the involvement of chNup210 in the chicken innate immune response against viral infection are recommended. (","PeriodicalId":17845,"journal":{"name":"Korean Journal of Poultry Science","volume":"63 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86026901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of Dietary Zinc Supplements on the Antioxidant Indicators and the Expression of Zinc Transport Genes in Korean Native Chicks 饲粮中添加锌对韩国地方鸡抗氧化指标及锌转运基因表达的影响

Korean Journal of Poultry Science Pub Date : 2019-09-01 DOI: 10.5536/kjps.2019.46.3.161

Dong-Gyung Jeon, Min-Jeong Kim, I. Yoon, Ho-Sung Ahn, S. Sohn, I. Jang

{"title":"Effects of Dietary Zinc Supplements on the Antioxidant Indicators and the Expression of Zinc Transport Genes in Korean Native Chicks","authors":"Dong-Gyung Jeon, Min-Jeong Kim, I. Yoon, Ho-Sung Ahn, S. Sohn, I. Jang","doi":"10.5536/kjps.2019.46.3.161","DOIUrl":"https://doi.org/10.5536/kjps.2019.46.3.161","url":null,"abstract":"Four-week-old male Korean native chicks (KNC) were assigned to 3 groups with 6 replicates (8 birds/replicate) in each group: a basal diet (CON, 100 ppm of Zn), basal diet fortified with 50 ppm of Zn with zinc oxide (ZnO), or basal diet fortified with 50 ppm of Zn with Zn-methionine (ZnM). Immediately after a 4-week-feeding trial, 6 birds per group were used to evaluate the effects of zinc supplements on antioxidant indicators and the mRNA expression of zinc transport genes. The nitrogen components, lipid peroxidation, and total antioxidant status in blood were not influenced by Zn fortified diets. However, the ZnM group showed a significant (P<0.05) increase in uric acid levels than those in the ZnO group. In the small intestine, superoxide dismutase (SOD) and glutathione peroxidase (GPX) activities, and malondialdehyde (MDA) level were unaffected by zinc supplements. The activity of glutathione S-transferase (GST) was significantly (P<0.05) enhanced by Zn-methionine supplementation. In the liver, the activity of GST was significantly (P<0.05) increased by Zn-methionine supplement without affecting SOD, GPX, and MDA levels. With respect to the mRNA expression of zinc transport genes, the ZnM group displayed a strong tendency for increases in intestinal ZnT-1 (P=0.09) and ZnT-5 (P=0.06) levels, compared to those in the CON group. Moreover, the ZnM group showed a tendency (P=0.10) for up-regulation of hepatic metallothionein mRNA as compared with the CON group. In conclusion, the Zn-fortified diet with 50 ppm of Zn-methionine helped to improve GST activity and Zn transport gene expression in the small intestine or liver of KNC. (","PeriodicalId":17845,"journal":{"name":"Korean Journal of Poultry Science","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86679720","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of Litter Type and Gender on Behavior Characteristics and Growth Performance of Korean Hanhyup Broiler 窝产类型和性别对韩合肉鸡行为特征和生长性能的影响

Korean Journal of Poultry Science Pub Date : 2019-09-01 DOI: 10.5536/kjps.2019.46.3.155

Ka-Young Yang, J. Ha, H. Roh, C. Cho, S. Oh, D. Oh

引用次数: 1

Effects of Dietary Apparent Metabolizable Energy and Protein Concentrations on Growth Performance, Nutrient Digestibility, and Quality of Korean Native Ducks 饲粮表观代谢能和蛋白质浓度对韩国土鸭生长性能、营养物质消化率和品质的影响

Korean Journal of Poultry Science Pub Date : 2019-09-01 DOI: 10.5536/kjps.2019.46.3.205

C. Kim, H. Kang

{"title":"Effects of Dietary Apparent Metabolizable Energy and Protein\u0000 Concentrations on Growth Performance, Nutrient Digestibility, and Quality of\u0000 Korean Native Ducks","authors":"C. Kim, H. Kang","doi":"10.5536/kjps.2019.46.3.205","DOIUrl":"https://doi.org/10.5536/kjps.2019.46.3.205","url":null,"abstract":"The objective of this experiment was to investigate the effect of dietary apparent metabolizable energy and protein concentrations on growth performance, carcass characteristics, and nutrient digestibility of Korean native ducks. In 2 × 2 factorial arrangement, 1-d-old Korean native ducks were completely randomized to experimental diets with 2,800 and 2,900 kcal of AMEn/kgofdiet, respectively, from 0 to 21 d of age. From 22 to 56 d of age, experimental diets 3,000 and 3,100 kcal of, and contained 16% and 17% CP, respectively. Feed and water were provided ad libitum. And BW gain were higher during 0 to 21 d (P<0.01) in AME 2,800 kcal/kg and CP 21% diet treatment than other treatments. As AME increased from 2,800 to 2,900 kcal/kg, feed intake was decreased (P<0.05) during 0 to 21 d. From 22 to 56 d of age, the, BW gain, feed intake and were not different among the treatments. Carcass ratio, relative weight per 100 of BW (wing, back, neck, breast, and leg), nutrient digestibility, meat color and nutrient composition in breast meat the treatments. In conclusion, diets with 2,800 kcal of AME/kg and 21% CP or with 3,000 kcal of AME/kg and 17% CP at 0 to 21 d and 22 to 56 d, respectively, were more efficient. (","PeriodicalId":17845,"journal":{"name":"Korean Journal of Poultry Science","volume":"78 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80964301","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

A Study on the Change of Production Performance of 5 Strains of Korean Native Chicken after Establishment of Varieties 5株韩国土鸡品种建立后生产性能变化的研究

Korean Journal of Poultry Science Pub Date : 2019-09-01 DOI: 10.5536/kjps.2019.46.3.193

K. Kim, B. Kang, Byoungho Park, H. Choo, I. Kwon, E. Choi, S. Sohn

{"title":"A Study on the Change of Production Performance of 5 Strains of\u0000 Korean Native Chicken after Establishment of Varieties","authors":"K. Kim, B. Kang, Byoungho Park, H. Choo, I. Kwon, E. Choi, S. Sohn","doi":"10.5536/kjps.2019.46.3.193","DOIUrl":"https://doi.org/10.5536/kjps.2019.46.3.193","url":null,"abstract":"This study aimed to investigate the changes in production performance of five strains of Korean native chickens (KNCs), which have been collected and established at the National Institute of Animal Science, Korea, since 1992. A total of 38,026 KNCs were tested and survival rate, body weight, age at first egg-laying, hen-housed egg production, and egg weight was analyzed. The mean survival rates of KNCs were 87.9±0.8%, but no significant difference in survival rate between strains and in the annual survival rates of KNCs was observed. The average body weight of KNCs was 1,609.7±21.3 g at 150 d. The average body weight of KNC-Black was the highest, whereas KNC-White had the lowest weight. A gradual increase in the annual weight change has been observed in almost all strains after 2004. The average age at first egg-laying was 146.9±1.1 d in KNCs where KNC-White was the earliest and KNC-Black was the latest. The age at first egg-laying has increased after 2003, but has gradually decreased after 2008. The average hen-housed egg production at 270 d was 77.3±1.7 in KNCs, wherein KNC-Yellowish brown was the highest and KNC-Black was the lowest. The average egg weight at 270 d was 51.2±0.3 g in KNCs, indicating that KNC-Black was the heaviest, whereas KNC-White was the lightest. A significant increase in annual egg weight has been observed since 2008. To conclude, the appearance and feather colors of KNCs have improved uniformly, and the body weight has also improved slightly since 2002. (","PeriodicalId":17845,"journal":{"name":"Korean Journal of Poultry Science","volume":"145 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74510219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4