{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,1]],"date-time":"2026-08-01T21:59:53Z","timestamp":1785621593497,"version":"3.56.0"},"reference-count":75,"publisher":"Oxford University Press (OUP)","issue":"11","license":[{"start":{"date-parts":[[2022,8,8]],"date-time":"2022-08-08T00:00:00Z","timestamp":1659916800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/pages\/standard-publication-reuse-rights"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2022,11,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>Liver abscess etiology in feedlot steers involves the escape of bacteria from the digestive tract to form a polymicrobial abscess within or on the external surface of the liver. However, little is known about the effects of feedlot finishing systems on the microbial composition of the liver abscess purulent material. Liver abscesses were collected at the time of harvest from steers originating from a single feedlot managed in either a traditional program (which included tylosin phosphate supplementation) or a natural program (without tylosin phosphate supplementation). The purulent material of liver abscesses from traditionally managed steers (N = 53 abscesses) and that of naturally managed steers (N = 62 abscesses) was characterized using the V4 region of the 16S rRNA gene. Two phyla and three genera were found in greater than 1% relative abundance across all abscesses. The genus Fusobacterium was identified in all liver abscess samples and accounted for 64% of sequencing reads. Bacteroides and Porphyromonas genera accounted for 33% and 1% of reads, respectively. Trueperella was more likely to be found in the liver abscesses of naturally managed steers than traditionally managed steers (P = 0.022). Over 99% of the genus-level bacterial sequences observed across all liver abscesses belonged to Gram-negative genera. Bacteria known to colonize both the rumen and hindgut were identified within liver abscesses. No differences in alpha diversity or beta diversity were detected between liver abscess communities (between the two management programs or individual pens) when tested as richness, Shannon Diversity Index, or weighted UniFrac distances (P &amp;gt; 0.05). These results were consistent with previous identification of Fusobacterium necrophorum as the primary bacteriologic agent within liver abscesses and emphasized the relationship between the gastrointestinal microbiota and liver abscess formation. Though the microbiota of the liver abscess purulent material was similar between steers fed an antibiotic-free diet and those fed an antibiotic-containing diet from the same feedlot, divergence was detected in liver abscess communities with some being dominated by Fusobacterium and others being dominated by Bacteroides.<\/jats:p>","DOI":"10.1093\/jas\/skac252","type":"journal-article","created":{"date-parts":[[2022,8,8]],"date-time":"2022-08-08T13:48:30Z","timestamp":1659966510000},"source":"Crossref","is-referenced-by-count":17,"title":["Liver abscess microbiota of feedlot steers finished in natural and traditional management programs"],"prefix":"10.1093","volume":"100","author":[{"given":"Luke K","family":"Fuerniss","sequence":"first","affiliation":[{"name":"Department of Animal Sciences, Colorado State University , Fort Collins, Colorado , USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Haley E","family":"Davis","sequence":"additional","affiliation":[{"name":"Department of Animal Sciences, Colorado State University , Fort Collins, Colorado , USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Aeriel D","family":"Belk","sequence":"additional","affiliation":[{"name":"Department of Animal Sciences, Colorado State University , Fort Collins, Colorado , USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jessica L","family":"Metcalf","sequence":"additional","affiliation":[{"name":"Department of Animal Sciences, Colorado State University , Fort Collins, Colorado , USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Terry E","family":"Engle","sequence":"additional","affiliation":[{"name":"Department of Animal Sciences, Colorado State University , Fort Collins, Colorado , USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"John A","family":"Scanga","sequence":"additional","affiliation":[{"name":"Department of Animal Sciences, Colorado State University , Fort Collins, Colorado , USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Franklyn B","family":"Garry","sequence":"additional","affiliation":[{"name":"Department of Clinical Sciences, Colorado State University , Fort Collins, Colorado , USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tony C","family":"Bryant","sequence":"additional","affiliation":[{"name":"Five Rivers Cattle Feeding, LLC , Johnstown, Colorado , USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jennifer N","family":"Martin","sequence":"additional","affiliation":[{"name":"Department of Animal Sciences, Colorado State University , Fort Collins, Colorado , USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2022,8,8]]},"reference":[{"key":"2022110917533310900_CIT0001","doi-asserted-by":"crossref","first-page":"279","DOI":"10.1016\/S0924-8579(99)90059-6","article-title":"Association between the consumption of antimicrobial agents in animal husbandry and the occurrence of resistant bacteria among food animals","volume":"12","author":"Aarestrup","year":"1999","journal-title":"Int. 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