BMC Veterinary Research最新文献

{"title":"Antimicrobial resistance of Escherichia coli in cats and their drinking water: drug resistance profiles and antimicrobial-resistant genes.","authors":"Panpicha Sattasathuchana, Suttiporn Srikullabutr, Anusak Kerdsin, Sathidpak Nantasanti Assawarachan, Patamabhorn Amavisit, Win Surachetpong, Naris Thengchaisri","doi":"10.1186/s12917-024-04435-8","DOIUrl":"10.1186/s12917-024-04435-8","url":null,"abstract":"<p><strong>Background: </strong>Antimicrobial resistance (AMR) is a global health concern that is exacerbated by the transmission of bacteria and genetic material between humans, animals and the environment. This study investigated AMR of Escherichia coli (E. coli) isolated from cats' feces and their drinking water. The study compared the AMR of fecal and environmental E. coli isolates from pet cats.</p><p><strong>Results: </strong>A total of 104 samples (52 cat feces and 52 cat drinking water samples) was cultured for E. coli. The study compared the AMR of fecal and environmental E. coli isolates from pet cats. An analysis of carbapenemase and extended-spectrum β-lactamase (ESBL)-producing E. coli genes (bla_TEM, bla_SHV and bla_CTX-M) and phylogroups of E. coli was also performed. E. coli was identified from all fecal (100%) and almost half of drinking water (44.2%) samples. All E. coli isolate was susceptible to amikacin or imipenem. Clindamycin showed the highest resistance rate. β-lactam was the most found with co-resistance profiles, comprising β-lactams with aminoglycosides, quinolones, sulfonamides, macrolides or carbapenems. Very strong positive correlations of bactericidal agents were found among quinolones (r > 0.8, p < 0.01). Within the group of bacteriostatic agents, moderate correlation was observed between azithromycin and sulfa-trimethoprim (r = 0.5253, p < 0.01). Carbapenemase gene was not detected in this study. Extended-spectrum β-lactamase-producing E. coli genes (bla_TEM, bla_SHV and bla_CTX-M) were identified in E. coli isolates, with bla_TEM being the most predominant. Furthermore, phylogroup B2 was the dominant segregation among the E. coli, particularly in fecal isolates.</p><p><strong>Conclusions: </strong>This study identified AMRin E. coli isolated from cats' feces and their drinking water.  The results revealed that the phylogroup B2 was predominant, with bla_TEM being the most widespread ESBL gene.</p>","PeriodicalId":9041,"journal":{"name":"BMC Veterinary Research","volume":"20 1","pages":"573"},"PeriodicalIF":2.3,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11660686/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142871319","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of growth traits in Turkish Merino lambs using multi-locus GWAS approaches: Middle Anatolian Merino.","authors":"Yalçın Yaman, Şükrü Doğan, Mesut Kirbaş, A Taner Önaldi, Yavuz Kal","doi":"10.1186/s12917-024-04428-7","DOIUrl":"10.1186/s12917-024-04428-7","url":null,"abstract":"<p><p>This study explored the genetic basis of growth traits in Middle Anatolian Merino lambs using multi-locus genome-wide association study (GWAS) analyses. Descriptive statistics indicated moderate heritability (h² = 0.363) for birth weight (BW) and (h² = 0.309) for weaning weight (WW), both statistically significant (p < 0.001). Strong genetic correlations were observed between WW and BW (rG = 0.922) and WW and Kleiber ratio (KR, rG = 0.896), implying that simultaneous improvements may be possible through targeted selection. Five multi-locus methods (mrMLM, FASTmrMLM, pLARmEB, FASTmrEMMA, and ISIS EM-BLASSO) were used to identify the polygenic basis of the traits. For BW and WW, 20 and 18 significant SNPs (LOD ≥ 5) were detected, respectively, with some SNPs co-detected by multiple methods. In contrast, only 10 significant SNPs were identified for KR, all exclusively by the ISIS EM-BLASSO approach. Pathway analyses within ± 100 Kb of associated SNPs revealed genes and pathways influencing these traits, which could be leveraged in future breeding programs for enhanced growth performance. The identified SNPs, particularly those associated with BW and WW traits, could facilitate genomic selection if validated in larger and more diverse populations.</p>","PeriodicalId":9041,"journal":{"name":"BMC Veterinary Research","volume":"20 1","pages":"567"},"PeriodicalIF":2.3,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11658107/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142852548","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Serum metabolic alterations in chickens upon infectious bursal disease virus infection.","authors":"Dan Wang, Jiangwei Song, Jing Wang, Rong Quan","doi":"10.1186/s12917-024-04402-3","DOIUrl":"10.1186/s12917-024-04402-3","url":null,"abstract":"<p><strong>Background: </strong>Infectious bursal disease virus (IBDV) is a highly contagious immunosuppressive virus of chickens. Chickens acquire infection by the oral route under natural conditions. Although the histological and pathological changes after IBDV infection are well described, the alterations in serum metabolome have not been reported. In this study, SPF chickens were infected with attenuated IBDV (atIBDV) strain LM and very virulent IBDV (vvIBDV) strain LX, respectively. On the seventh day after oral infection, serum samples of experimental chickens were identified using ultra-high performance liquid chromatography-MS/MS (UHPLC-MS/MS). The serum metabolic profiles were analyzed by multivariate statistical methods. KEGG enrichment analysis was performed to evaluate the dysregulated biological pathways.</p><p><strong>Results: </strong>We identified 368 significantly altered metabolites in response to both atIBDV and vvIBDV infection. The metabolic disorder of amino acid and lipid was associated with IBDV infection, especially tryptophan, glycerophospholipid, lysine, and tyrosine metabolism. The differential metabolites enriched in the four metabolic pathways were PC(20:4(5Z,8Z,11Z,14Z)/18:0), PE(16:0/18:2(9Z,12Z)), PE(16:0/22:6(4Z,7Z,10Z,13Z,16Z,19Z)), PE(18:0/20:4(5Z,8Z,11Z,14Z)), PE(18:0/20:4(8Z,11Z,14Z,17Z)), PE(18:0/22:6(4Z,7Z,10Z,13Z,16Z,19Z)), PE(20:3(8Z,11Z,14Z)/16:0), PE(22:6(4Z,7Z,10Z,13Z,16Z,19Z)/16:0), PE-NMe(20:5(5Z,8Z,11Z,14Z,17Z)/18:0), PS(20:3(5Z,8Z,11Z)/18:2(9Z,12Z)), 2-aminobenzoic acid, 4-(2-aminophenyl)-2,4-dioxobutanoic acid, N-acetylserotonin, 5-hydroxyindoleacetate, indole-3-acetaldehyde, indole-3-acetate, p-coumaric acid, L-tyrosine, homovanillin, and S-glutaryldihydrolipoamide.</p><p><strong>Conclusion: </strong>The atIBDV and vvIBDV infection causes metabolic changes in chicken serum. The differential metabolites and dysregulated metabolic pathways reflect the host response to the IBDV infection.</p>","PeriodicalId":9041,"journal":{"name":"BMC Veterinary Research","volume":"20 1","pages":"569"},"PeriodicalIF":2.3,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11657878/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142852574","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Shaken, not stirred: magnetic bead DNA extraction as a rapid and effective method for the scaling up of bovine tuberculosis diagnosis.","authors":"V Lorente-Leal, A Gomez-Buendia, A Gutiérrez-Tobaruela, L de Juan, J Bezos, B Romero","doi":"10.1186/s12917-024-04427-8","DOIUrl":"10.1186/s12917-024-04427-8","url":null,"abstract":"<p><strong>Background: </strong>The growing use of real-time PCR (qPCR) as a diagnostic method for bovine TB (bTB) requires rapid and effective DNA extraction methods, which are crucial for its success. Automated DNA extraction methods based on magnetic beads are a promising alternative to conventional silica column-based protocols (COL protocol) due to their high throughput capacity and reduced hands-on time. This study aimed to assess the performance of the MagMax CORE Nucleic Acid Purification kit and the KingFisher Flex instrument (KF protocol) as an alternative for scaling up the use of qPCR in bTB diagnosis.</p><p><strong>Methodology: </strong>Performance was evaluated with two different real-time PCR (qPCR) protocols, based on the IS6110 element and the QuantiFast and VetMAX™ (QF and VM protocols) kits, on 145 frozen tissue homogenates confirmed as either bTB-positive or negative through a composite reference standard based on microbiological culture, column-based extraction, and qPCR, as well as on negative tissue samples spiked with 10⁶ to 10³ CFU/ml of M. bovis BCG.</p><p><strong>Results: </strong>The performance of both qPCR protocols was very high on samples extracted using the KF protocol, with positive percent agreement (PPA) values of 89.04% [95% Confidence Interval (CI): 79.54-95.15%] and 93.15% [95% CI: 84.74-97.74%] for the QF and VM protocols, respectively, and negative percent agreement (NPA) values of 100% [95% CI: 95.01-100.00%]. A higher variability was identified in samples analysed with the same qPCR protocol but different extraction methods. Higher Ct values were identified for samples extracted using the KF protocol in both routine and spiked samples, likely due to using the same amount of starting material for both extraction methods, which was lower than recommended by the manufacturer for the KF protocol.</p><p><strong>Discussion: </strong>The results of this study indicate that the MagMAX CORE Nucleic Acid Purification kit coupled with a KingFisher Flex instrument is a valuable alternative for the extraction of MTBC DNA from bovine tissues. However, the increased variability and Ct values suggest that a larger amount of starting material is recommended for this methodology, warranting further studies.</p>","PeriodicalId":9041,"journal":{"name":"BMC Veterinary Research","volume":"20 1","pages":"568"},"PeriodicalIF":2.3,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11657575/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142852577","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The cow GUTBIOME CY study: investigating the composition of the cattle gut microbiome in health and infectious disease transmission in cyprus.","authors":"Daphne E Mavrides, Maria Liapi, Despo Ierodiakonou, Christodoulos Pipis, Stavros Malas, Eleni Gentekaki, Anastasios D Tsaousis","doi":"10.1186/s12917-024-04419-8","DOIUrl":"10.1186/s12917-024-04419-8","url":null,"abstract":"<p><strong>Background: </strong>Recent evidence suggests that the lower gut microbiome of ruminants presents roles in their health and environment, including the development of the mucosal immune system, milk production efficiency and quality and subsequent methane emissions. However, there are proportionately fewer studies on this complex microbial community in cattle and region-focus studies are non- existent.</p><p><strong>Methods: </strong>Herein, we present the research protocol of the GUTBIOME CY project pertaining to determine the composition of the lower gut microbiome in dairy cows situated in 37 farms across five districts of the island of Cyprus. Detailed questionnaires on animal husbandry and farming practices will be gathered from each farm. Faecal, milk (individual and bulk) and water samples will also be collected from cows and their offspring. Samples will be analysed using a combination of molecular biology and bioinformatics pipelines to define microbiome profiles and antimicrobial resistance (AMR). Information collected from the questionnaires will be used to test for associations between animal husbandry or farming practices and microbiome components and AMR.</p><p><strong>Discussion: </strong>Collected samples will establish the first dairy cattle biobank in the country for contributing substantially towards scientific advancements in microbiome research and providing insights to all stakeholders, tailored to the unique agricultural context of Cyprus.</p>","PeriodicalId":9041,"journal":{"name":"BMC Veterinary Research","volume":"20 1","pages":"566"},"PeriodicalIF":2.3,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11657508/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142852582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation on parasite infection and anthelmintic resistance of gastrointestinal nematodes in sheep in Hinggan league (City), China.","authors":"Yanmin Zhang, Weijie Wu, Zhiming Bai, Hao Zhang, Hao Liu, Lili Zhang, Chagan Luo, Mulan Chen, Jing Lu, Wa Gao, Wenlong Wang, Chunxia Liu","doi":"10.1186/s12917-024-04420-1","DOIUrl":"10.1186/s12917-024-04420-1","url":null,"abstract":"<p><strong>Background: </strong>Different areas of sheep infected with different types of parasites, all will cause serious harm to the local sheep, and the widespread use and repeated use of anthelmintics have produced different degrees of anthelmintic resistance (AR) in various regions. We re-investigated the infection of common parasites and AR of Gastrointestinal Nematodes (GINs) in sheep in Horqin Right Wing Front Banner, and first investigated the common parasite types and AR of GINs in sheep at other four areas in Hinggan league (city), China.</p><p><strong>Results: </strong>A total of 1770 fecal samples were collected from 1 prefecture-level city and 4 counties in Hinggan league, in which the infection rate of Coccidia ranged from 83.3% to 96.06%, that of Ascaris ovis ranged from 10.17% to 15.19%, that of Moniezia benedeni ranged from 0.6% to 1%, that of Moniezia expansa ranged from 0.33% to 8.15%. The infection rate of GINs was 100%, and Haemonchus contortus was still the dominant species. The AR results showed that only the closantel in Horqin Right Wing Middle Banner was low resiatant, and the other three regions had been resistant. Levamisole also occurred AR in the other four regions, the widely used ivermectin and albendazole had produced serious AR in five areas. The research shows that GINs are becoming more and more resistant to various anthelmintics, which has made the problem worse.</p><p><strong>Conclusions: </strong>Understanding the dynamic changes of parasite infections and the development trend of AR in sheep in the region in this paper, the development trend seems to be more serious than imagined. Therefore only by deeply understanding the parasitic infections of sheep in this land can more reasonable medication guidance be carried out. It is expected to provide new ideas formore innovative, scientific and sustainable methods of preventing and controlling parasites.</p>","PeriodicalId":9041,"journal":{"name":"BMC Veterinary Research","volume":"20 1","pages":"564"},"PeriodicalIF":2.3,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11657611/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142852550","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The effect of lysophosphatidic acid on myometrial contractility and the mRNA transcription of its receptors in the myometrium at different stages of endometrosis in mares.","authors":"Katarzyna Karolina Piotrowska-Tomala, Anna Szóstek-Mioduchowska, Agnieszka Walentyna Jonczyk, Ewa Monika Drzewiecka, Michał Hubert Wrobel, Takuo Hojo, Graca Ferreira-Dias, Dariusz Jan Skarzynski","doi":"10.1186/s12917-024-04384-2","DOIUrl":"10.1186/s12917-024-04384-2","url":null,"abstract":"<p><strong>Background: </strong>Endometrosis (chronic degenerative endometritis) results in morphological changes in the equine endometrium and impairs its secretory function. However, the effect of this condition on the myometrium remains unclear. Lysophosphatidic acid (LPA) may affect female reproductive function and embryo transport by influencing uterine contractility through its receptors (LPARs). The objective of this study was to determine myometrial LPAR1-6 mRNA transcription, and the effects of LPA on myometrial contractions in mares with endometrosis during the mid-luteal and follicular phases of the estrous cycle.</p><p><strong>Results: </strong>A reduction in myometrial LPAR1 mRNA transcription was observed in mares with endometrosis during the mid-luteal phase, in comparison to those with category I endometria (P < 0.05). While, upregulation of myometrial LPAR3 or LPAR6 mRNA transcription was observed in mares with category III or IIB endometria; respectively (P < 0.05). An increase in myometrial LPAR1, LPAR3 and LPAR5 mRNA transcription was observed during the follicular phase in mares with category IIA endometrium in comparison to their expression in category I endometrium (P < 0.05). During endometrosis progression LPA reduced the force of myometrial contractions in both phases of the estrous cycle (P < 0.05). However, in mares with category IIA endometrium during the follicular phase, LPA was found to increase the force of contraction of myometrial strips in comparison to mares with category I endometrium (P < 0.01).</p><p><strong>Conclusion: </strong>In the course of endometrosis in mares, a disruption in the myometrial mRNA transcription of LPARs has been observed. This is the first study to examine the impact of LPA on myometrial contractility at diffrent stage of endometrosis. However, it is essential to consider that multiple factors may contribute to this process. Alternations in contractile activity and changes in myometrial LPARs mRNA transcription may indicate impaired LPA-signaling mechanisms in equine myometrium during endometrosis.</p>","PeriodicalId":9041,"journal":{"name":"BMC Veterinary Research","volume":"20 1","pages":"571"},"PeriodicalIF":2.3,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11658124/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142852583","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparative evaluation of rapid diagnostic test and PCR-based diagnostic assay for identification of trypanosomes in cattle of Apac and Kiryandongo districts, Uganda: A cross sectional study.","authors":"Daniel Kizza, Rose Azuba, Eddie Wampande, Rodney Okwasiimire, Lillian Owembabazi, Wangoola Mandela, Charles Waiswa, Agricola Odoi","doi":"10.1186/s12917-024-04436-7","DOIUrl":"10.1186/s12917-024-04436-7","url":null,"abstract":"<p><strong>Background: </strong>Diagnostic tests and knowledge of their diagnostic accuracies are important for animal trypanosomosis surveillance and treatment.</p><p><strong>Methodology: </strong>A cross-sectional study was conducted in November 2021 to compare the performance of rapid diagnostic test (RDT) and PCR-based assay for the detection of trypanosome infections. Random sampling and probability proportional to size sampling were used to sample study households and animals from the sampled household respectively. Animals were screened for the presence of trypanosomes using both tests. A total of 100 cattle (52 from Apac and 48 from Kiryandongo districts) were included in the study. The percentage of positive tests, sensitivity, and specificity of the tests using mini PCR as a reference were computed. Cohen's kappa statistics was computed to assess how well the rapid diagnostic test agrees with the mini PCR. McNemar's statistic assessed if the proportion of positive tests identified by mini PCR significantly differed from that identified by the rapid diagnostic test.</p><p><strong>Results: </strong>The mini PCR test detected 31.2% Trypanosome spp positive samples in Kiryandongo while it detected only 5.7% positive samples in Apac district. The rapid diagnostic test (RDT) analysis detected 91.6% Trypanosome spp positive samples in Kiryandongo district and only 46.1% in Apac district. T. congolense was the most common Trypanosoma species identified in Apac (36.5%) and Kiryandongo (47.9%) by the RDT. The percentage of each of the Trypanosome species (T.vivax, T.congolense, and mixed infection of T.vivax and T. congolense) detected by RDT differed significantly (p < 0.001) between the two districts. The RDT had a high sensitivity of 94.4% (95% Confidence Interval (CI): 72.7-99.9) but a very low specificity of 36.6% (95% CI: 26.2-48.0). The kappa test showed evidence of only a slight agreement (kappa = 0.1547, Accuracy = 0.48 (95% Confidence Interval (CI): 0.379,0.5822) between the two tests. The observed agreement between the tests was 47% while the expected agreement was 37.84%.</p><p><strong>Conclusion: </strong>This study found high sensitivity but low specificity of RDT using mini PCR as a reference.</p>","PeriodicalId":9041,"journal":{"name":"BMC Veterinary Research","volume":"20 1","pages":"570"},"PeriodicalIF":2.3,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11658059/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142852529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Isolation of porcine epidemic diarrhea virus strain CHCQ-2023 from Chongqing Province and analysis of S gene recombination.","authors":"Siying Wang, Xia Hu, Tao Xiong, Lijing Cao, Xingcui Zhang, Zhenhui Song","doi":"10.1186/s12917-024-04390-4","DOIUrl":"10.1186/s12917-024-04390-4","url":null,"abstract":"<p><strong>Background: </strong>In recent years, the prevalence and incidence of porcine epidemic diarrhea virus (PEDV) infection have been on the rise. The occurrence of multiviral infections and recombination mutations has led to accelerated viral evolution and reduced vaccine efficacy. In the present study, a PEDV strain was isolated from a pig farm (Chongqing Province, China) with an outbreak of porcine diarrhea, and its S gene was found to be recombinant.</p><p><strong>Results: </strong>The optimal trypsin concentration for blind passage of PEDV in Vero cells was determined to be 7.5 µg/mL. Following two blind passages of the virus in Vero cells, the virus was unable to adapt to the cells. Therefore, PEDV was blindly passaged in IPEC-J2 cells using the optimal concentration of trypsin (5 µg/mL). Next, a series of characterization experiments were performed. Recombination analyses of the isolates using software revealed that the S gene of strain CHCQ-2023 was derived from the primary parent strain PEDV-1 C and secondary parent strain SQ2014, with recombination occurring at a 3152 bp breakpoint. Furthermore, a specific B-cell antigenic epitope was predicted on the S2 subunit of the S protein.</p><p><strong>Conclusion: </strong>A PEDV strain was isolated and characterized, and its S gene was characterized. The findings provide a bioinformatic basis for the study of PEDV strain variation due to genetic recombination.</p>","PeriodicalId":9041,"journal":{"name":"BMC Veterinary Research","volume":"20 1","pages":"565"},"PeriodicalIF":2.3,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11657806/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142852500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microbiome-proteome analysis of gastrointestinal microbiota and longissimus thoracis muscle proteins in cattle with high and low grades of marbling.","authors":"Mingyan Shi, Zhichao Li, Shuaishuai Hu, Pei Zhang, Shuaitao Meng, Luyao Huang, Zhiguo Miao, Jinzhou Zhang","doi":"10.1186/s12917-024-04417-w","DOIUrl":"10.1186/s12917-024-04417-w","url":null,"abstract":"<p><p>Marbling is a key indicator of the meat quality of ruminants. Gastrointestinal microbiota may regulate the formation of marbling by influencing the nutritional metabolism of animals. This study analyzed the composition and functional differences of microbiota in the rumen and cecum, the differences in volatile fatty acids (VFAs) content in the longissimus thoracis muscle, and the differences in protein abundance in the longissimus thoracis muscle of ruminants with different marbling grades through microbiome-proteome analysis. The results showed that the diversity of gastrointestinal microbiota in high-marbling ruminants was significantly higher than that in low-marbling ruminants. The relative abundance of Firmicutes and Akkermansia in the gastrointestinal of high-marbling ruminants was higher than that in low-marbling ruminants, while the relative abundance of Bacteroidetes and Prevotella was lower. In addition, PICRUST2 functional prediction results of the microbiota revealed that the gastrointestinal microbiota of high-marbling ruminants was mainly involved in the biosynthesis pathways of fat and lipids. The metabolomics results showed that the content of VFAs (acetic acid, propionic acid, butyric acid, isovaleric acid, valeric acid, and hexanoic acid) in the rumen of high-marbling ruminants was significantly higher than that in low-marbling ruminants. The proteome analysis results indicated that the differential proteins in the longissimus thoracis muscle of high-marbling ruminants were mainly involved in lipid transport and metabolism compared to low-marbling ruminants. In summary, the differences in the composition and function of the gastrointestinal microbiota led to higher levels of VFAs in the gastrointestinal tract of high-marbling ruminants, which provides the basis for lipid/fat synthesis. The proteome results of the longissimus thoracis muscle support the view that high-marbling ruminants have richer lipid transport and metabolic functions in their muscle.</p>","PeriodicalId":9041,"journal":{"name":"BMC Veterinary Research","volume":"20 1","pages":"563"},"PeriodicalIF":2.3,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11657120/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142852560","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}