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Perturbations of the ileal mycobiota by necrotic enteritis in broiler chickens

Journal of Animal Science and Biotechnology 2022年第2期13卷 520-535页

作者： qing yang Jing Liu kelsy J.robinson Melanie A.Whitmore Sydney n.Stewart Guolong Zhang Department of Animal and Food Sciences Oklahoma State UniversityStillwaterOKUSA Poultry Production and Product Safety Research Unit USDA-Agricultural Research ServiceFayettevilleARUSA Safety and Security Division Institute for Public ResearchCNAArlingtonVAUSA

Background:Intestinal microbiota is critical for maintaining animal health and ***,involvement of the fungal community,also known as the mycobiota,in animal health and disease is poorly *** study was aimed to examine the association between the intestinal mycobiota and the severity of necrotic enteritis(nE),an economically significant poultry ***:A total of 90 day-of-hatch Cobb broilers were infected with Eimeria maxima on d 10,followed by an oral challenge with *** on d 14 to induce nE,while another 10 broilers were served as mock-infected *** d 17,the lesions in the jejunum were scored,and the ileal digesta were subjected to DnA isolation and real-time PCR quantification of total bacterial and fungi *** transcribed spacer 2(ITS2)amplicon sequencing was also performed to profile the ileal mycobiota *** in the ileal mycobiota in response to nE were *** correlation analysis was further conducted to identify the correlations between relative abundances of individual ileal fungi and the severity of ***:While the total bacterial population in the ileum was increased by 2-to 3-fold in nE chickens,the total fungal population was progressively declined in more exacerbated nE,with the most severely infected chickens showing a nearly 50-fold reduction relative to mock-infected *** of the ileal mycobiota also tended to reduce in chickens with nE(P=0.06).Compositionally,among 30 most abundant fungal amplicon sequence variants(ASVs),11 were diminished and 7 were enriched(Pned largely unchanged in nEafflicted chickens(P>0.05).Multiple Wallemia and Aspergillus species were markedly diminished in nE(Pnd also showed a significant negative correlation with nE severity(Pnclusions:Dysbiosis of the ileal mycobiota is induced evidently by nE and the extent of the dysbiosis is positively correlated with disease ***

关键词： Antimicrobial resistance C.perfringens Dysbiosis ITS sequencing Microbiome Mycobiota necrotic enteritis Poultry

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Linkage between the intestinal microbiota and residual feed intake in broiler chickens

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Journal of Animal Science and Biotechnology 2021年第3期12卷 1073-1088页

作者： Jing Liu Sydney n.Stewart kelsy robins.n.qing yang Wentao Lyu Melanie A.Whitmore Guolong Zhang Department of Animal and Food Sciences Oklahoma State UniversityStillwaterOKUSA Poultry Production and Product Safety Research Unit USDA-Agricultural Research Service(ARS)FayettevilleARUSA Institute of Quality and Standards for Agro-products Zhejiang Academy of Agricultural SciencesHangzhouChina

Background:Intestinal microbiota plays a key role in nutrient digestion and utilization with a profound impact on feed efficiency of livestock ***,the intestinal microbes that are critically involved in feed efficiency remain ***:To identify intestinal bacteria associated with residual feed intake(RFI)in chickens,male Cobb broiler chicks were individually housed from day 14 to day *** RFI values were calculated for 56 *** contents were collected from the ileum,cecum,and cloaca of each animal on day *** DnA was isolated and subjected to 16S rRnA gene *** microbiota was classified to the feature level using Deblur and QIIME *** and low RFI groups were formed by selecting 15 and 17 chickens with the most extreme RFI values for subsequent LEfSe comparison of the difference in the *** correlation analysis was further performed to identify correlations between the intestinal microbiota composition and ***:no significant difference in evenness,richness,and overall diversity of the microbiota in the ileum,cecum,or cloaca was observed between high and low RFI ***,LEfSe analysis revealed a number of bacterial features being differentially enriched in either high or low RFI *** correlation analysis further identified many differentially enriched bacterial features to be significantly correlated with RFI(Pntly,not all short-chain fatty acid(SCFA)producers showed a positive association with *** two novel members of Oscillibacter and Butyricicoccus were more abundant in low-RFI,high-efficiency chickens,several other SCFA producers such as Subdoligranulum variabile and two related Peptostreptococcaceae members were negatively associated with feed ***,a few closely-related Lachnospiraceae family members showed a positive correlation with feed efficiency,while others of the same family displayed an opposite relationship.C

关键词： Feed conversion ratio Feed efficiency Microbiota Poultry Residual feed intake

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