Tropical animal health and production最新文献

{"title":"The effects of naked neck and frizzle genes on the fertility, hatchability, egg quality and pterylosis of locally developed commercial layer parent lines.","authors":"Gregory Tamba Dunga, Kwaku Adomako, Bernard Ato Hagan, Jacob Alhassan Hamidu, Oscar Simon Olympio","doi":"10.1007/s11250-025-04335-5","DOIUrl":"https://doi.org/10.1007/s11250-025-04335-5","url":null,"abstract":"<p><p>In this study, the effects of feather cover and feather colour genotypes and their interactions on the fertility, hatchability, external and internal egg qualities of 24-week-old locally developed layer parent lines were assessed. A 2 x 3 factorial experiment laid out in a randomized complete block design of two feather colour variants (brown and white) and three feather cover genotypes (naked neck, frizzle and normal feather) was used for this study. A total of 3,196 eggs from 360 layers of three feather genotypes were set for incubation. Data on fertility, hatchability, egg quality characteristics and chick weight were analysed using the PROC MIXED of SAS and differences between means were separated using LSD at 5% probability level. Percentage fertility of eggs of naked neck and frizzle feathered birds were significantly higher (p<0.05) than those in the normal feathered birds (71.98%, 70.29% vs 63.17%). Eggs of frizzle feathered birds (76.81%) recorded higher (p<0.05) hatchability than those of the naked neck (65.07%) and normal feathered birds (59.64%). Feather cover genotype had no significant difference (p>0.05) on weight of day-old chick. Feather colour genotype significantly (p<0.05) influenced egg weight but not other external egg characteristics. Feather cover and colour genotypes had significant (p<0.05) effect on some of the internal egg qualities. Follicle numbers in the ventral, dorsal and lateral regions were lower (p<0.05) in the naked neck birds relative to the frizzle and normal feathered birds. The incorporation of F and Na alleles into layer parent stocks in hot humid areas could improve fertility, hatchability and egg quality traits of birds.</p>","PeriodicalId":23329,"journal":{"name":"Tropical animal health and production","volume":"57 2","pages":"86"},"PeriodicalIF":1.7,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143524547","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Greenhouse gas emissions from Fleckvieh cattle production systems in the Amazon region, Peru.","authors":"Deysi Ruiz-Llontop, Segundo M Portocarrero-Villegas, Hugo Frias, Luis Murga, Joe Mantilla-Oliva, Dante M Pizarro, José Velarde-Guillén, José Américo Saucedo-Uriarte","doi":"10.1007/s11250-025-04358-y","DOIUrl":"10.1007/s11250-025-04358-y","url":null,"abstract":"<p><p>This study aimed to quantify the carbon footprint (CF) from Fleckvieh cattle production systems in the Amazon region of Peru. Ten farms distributed across four provinces: Chachapoyas (System I; n = 2), Bongara (System II; n = 4), Rodriguez de Mendoza (System III; n = 2), and Utcubamba (System IV; n = 2) were assessed. Parameters such as average live weight, animal units (AU), dry matter intake, fat and protein-corrected milk (FPCM), digestibility, and protein content of consumed forage were analyzed. CF was calculated using the 2019 Refinement to 2006 IPCC guidelines. The database was analyzed using analysis of variance and Duncan's statistical test (p < 0.05) to compare the systems. A Pearson correlation was carried out to observe the variables association level. Results revealed a CF of 2.50, 2.70 and 2.65 kg CO₂eq/kg FPCM by biophysical allocation, according to Global Warming Potential 2007, 2014 and 2021, respectively. Enteric methane (82.6%) and nitrous oxide from manure management (17.2%) were the main contributors to greenhouse gas emissions. Positive correlations were found between methane and nitrous oxide emissions whit total FPCM (r = 0.94), total AU (r = 0.99), and low-producing animals (r = 0.96). System I exhibited the lowest enteric methane emissions, suggesting better livestock and feed management. The study highlights the need to optimize herd composition, increase production levels, and reduce low-producing animals to mitigate CF. Additionally, improving forage quality (increasing the digestibility) enhances milk production, securing the economic well-being of smallholder farmers and agricultural sustainability in the Amazon region.</p>","PeriodicalId":23329,"journal":{"name":"Tropical animal health and production","volume":"57 2","pages":"83"},"PeriodicalIF":1.7,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11868227/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143516449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Evaluation of the effect of red cabbage waste on performance, egg quality, and yolk oxidative stability of laying Japanese quails (Coturnix coturnix Japonica).","authors":"Erinç Gümüş, Behlül Sevim, Selim Sırakaya, Canan İriş, Oğuzhan Kahraman, Ainhoa Sarmiento-García","doi":"10.1007/s11250-025-04336-4","DOIUrl":"10.1007/s11250-025-04336-4","url":null,"abstract":"<p><p>This study investigates the effects of red cabbage waste (RCW) as a dietary supplement on the performance, egg quality, and oxidative stability of yolk in laying Japanese quails. Given its rich phenolic content, RCW has been investigated as a natural feed additive to reduce food waste and enhance poultry diets. In a six-week trial, 120 quails were divided into 4 groups with 5 replicates and fed diets with 0.0%, 0.5%, 1.0%, and 2.0% RCW. Performance parameters, internal and external egg quality, and antioxidant status were measured. RCW supplementation had no significant impact on overall quail performance. Quails fed with 0.5% RCW showed notable improvements in internal egg quality, especially in the albumen index, Haugh unit, and eggshell thickness. Additionally, incorporating 0.5% RCW into the diet improved the yolk's antioxidant activity, as evidenced by reduced MDA levels. However, other egg quality traits, including the antioxidant capacity of the yolk, had deteriorated with concentrations above 0.5%, indicating that a moderate inclusion of 0.5% RCW is the most favourable option. The findings underscore that RCW could be sustainably used to improve egg quality without compromising performance, while managing food waste, presenting a potential circular economy solution. Nevertheless, further research is encouraged to optimize RCW levels and fully understand its benefits in poultry feed.</p>","PeriodicalId":23329,"journal":{"name":"Tropical animal health and production","volume":"57 2","pages":"82"},"PeriodicalIF":1.7,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11868177/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143516448","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Patanwadi sheep wool profile: yield, morphology and physico-mechanical properties.","authors":"Vinod Kadam, Aakanksha Singh, Ajay Kumar, Arun Kumar","doi":"10.1007/s11250-025-04332-8","DOIUrl":"https://doi.org/10.1007/s11250-025-04332-8","url":null,"abstract":"<p><p>The Patanwadi sheep breed, an indigenous species from Gujarat, India, is primarily reared for wool, mutton, and household milk production. Patanwadi wool attracts lower prices mainly because of its coarseness. However, complete wool profiling of Patanwadi sheep has remained unknown to date. This study comprehensively analyzes clean fiber (scouring) yield, morphology, elements, and physico-mechanical properties of Patanwadi wool. The physico-mechanical properties determined include fiber diameter, staple length, crimp per centimeter, color, bundle strength, elongation, and modulus. Scanning electron microscopy analysis reveals distinct fiber scale morphology, with sharper scales in male sheep wool compared to female counterparts. Additionally, energy-dispersive X-ray analysis confirmed the presence of sulfur and trace levels of calcium within Patanwadi wool fibers. Results indicate a statistically significant effect (P < 0.05) of animal sex on the physico-mechanical parameters, including elongation, modulus, moisture content, and moisture regain. Given its coarse nature and high medullation, Patanwadi wool is less suited for fine apparel but holds promise as an insulation material and in other innovative coarse wool applications. This research broadens the utility of Patanwadi coarse wool for value-added practical end uses, ensuring sustainability and yielding better realization of the wool.</p>","PeriodicalId":23329,"journal":{"name":"Tropical animal health and production","volume":"57 2","pages":"84"},"PeriodicalIF":1.7,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143516467","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of Asystasia gangetica inclusion in the diet on the feed intake, growth performance, and meat quality of Muscovy ducks.","authors":"Muhammad Zikri Abdul Hakem, Kim Shi Qi, Mohammad Mijanur Rahman, Zulhisyam Abdul Kari, Candyrine Su Chui Len","doi":"10.1007/s11250-025-04338-2","DOIUrl":"10.1007/s11250-025-04338-2","url":null,"abstract":"<p><p>The rising cost of imported feedstuffs in poultry production is a significant concern for producers. Utilising local resources like Asystasia gangetica, a common perennial weed with high nutritional value, offers a promising alternative. Ducks can better digest high-fibre diets than chickens, making them ideal for this study, which evaluated the effects of pelleted diets containing various levels of A. gangetica on feed intake, growth performance, and meat quality in Muscovy ducks. Sixty 2-week-old ducks were divided into four dietary groups: 0% (control), 5% (T1S), 10% (T2S), and 20% (T3S) during the starter phase, and 0% (control), 10% (T1G), 20% (T2G), and 30% (T3G) during the grower phase with three replicates per group (five birds per replicate). Ducks on T3S and T3G diets had higher crude fibre and ash intakes, while those on the control diet consumed more crude protein (CP) and ether extract. Overall body weight, weight gain, and feed conversion ratio were better (p < 0.05) in ducks received the control diet compared to those received the other diets. No significant differences in carcass composition were found between the studied groups, except in meat quality. Varying levels of A. gangetica affected (p < 0.05) the magnesium and potassium levels in meat, with T1G showing the highest concentrations of both minerals. However, the control group had the highest protein content in meat. In conclusion, incorporating A. gangetica up to 10% in the starter diet and 20% in the grower diet does not adversely affect dry matter or CP intakes or weight gain, making it a viable feed ingredient.</p>","PeriodicalId":23329,"journal":{"name":"Tropical animal health and production","volume":"57 2","pages":"85"},"PeriodicalIF":1.7,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143516376","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Epidemiological and molecular study of Theileria spp. in sheep and goats in Erbil, Iraq.","authors":"Khalid Jabar Aziz, Bafrin Qader Hamadamin","doi":"10.1007/s11250-025-04330-w","DOIUrl":"https://doi.org/10.1007/s11250-025-04330-w","url":null,"abstract":"<p><p>Theileria spp. are a group of hemoprotozoal parasites pose a significant threat to small ruminants in tropical and subtropical regions of the world. Because of that and due to the limited data on the genetic diversity of Theileria species in Erbil Governorate, northern Iraq, this study was conducted to assess the prevalence of Theileria spp. in sheep and goats using both Giemsa-stained blood smears and PCR methods as a diagnostic criterion. The overall infection rate detected by blood smears was 26.2% in sheep and 18.3% in goats, while PCR showed higher infection rates, 47.7% in sheep and 38.3% in goats. PCR analysis identified various Theileria species, including T. ovis, T. lestoquardi, T. uilenbergi, and T. annulata, each displaying different prevalence rates. Significantly, T. lestoquardi had the highest rate of single infections, especially in goats, with an infection rate of 34.8%. Mixed infections were prevalent, occurring in 22.6% of sheep and 26.1% of goats, primarily involving T. ovis and T. lestoquardi. An assessment of factors influencing infection rates revealed that tick infestation and irregular use of acaricides were significant risk factors. Sheep with tick infestations exhibited a 59% infection rate, while goats had an infection rate of 44.25%. Regular use of acaricides was associated with a reduction in prevalence in both species. Additionally, animals with a history of tick infestations and those in communal grazing systems demonstrated higher infection rates. The sequence analysis of isolates from sheep and goats, based on the 18S rRNA gene, identified several species. The identified species have been deposited in the NCBI with the following accession numbers: T. ovis (PQ325696, PQ325698), T. lestoquardi (PQ325701, PQ325702), T. uilenbergi (PQ325706, PQ325707), and T. annulata (PQ325699, PQ325700). The findings from this investigation offer valuable insights into the genetic diversity and epidemiology of Theileria species in sheep and goats. It can be concluded that periodically controlling vector ticks and arthropods is an important factor in controlling and reducing the spread of theileriosis in targeted domestic animals.</p>","PeriodicalId":23329,"journal":{"name":"Tropical animal health and production","volume":"57 2","pages":"80"},"PeriodicalIF":1.7,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143504362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"First molecular evidence of Candidatus Anaplasma camelii in two dromedary camels from Qatar.","authors":"Amir A Shehata, Mohamed A Radwan, Hanaa A Ahmed","doi":"10.1007/s11250-025-04334-6","DOIUrl":"https://doi.org/10.1007/s11250-025-04334-6","url":null,"abstract":"<p><p>Anaplasma species are intracellular pathogens that impact human and animal health. Despite Qatar having the highest density of dromedary camel (Camelus dromedarius) population, there have been no previous reports of anaplasmosis in dromedary camels in the country. Here, two cases of 5-year-old female dromedary camels presented symptoms like fever, reduced appetite, edema, and respiratory distress. These camels had a history of unsuccessful treatment for trypanosomiasis, on that basis diagnosis of possible anaplasmosis was made. DNA was extracted from the whole blood and then subjected to PCR testing and sequencing targeting 16S rRNA and groEL genes which confirmed both cases to be positive for Anaplasma. Phylogenetic analysis using 16S rRNA exhibited a 100% similarity with Candidatus Anaplasma camelii, while groEL gene showed a 100% match with A. platys-like. Phylogenetic analysis indicated that Candidatus Anaplasma camelii and A. platys-like sequences were grouped in the same cluster either in 16S RNA or groEL and were closely related to A. platys. The Infected cases highlight the need for a large-scale molecular diagnostic effort to monitor the clinical health of animals with a particular focus on camels in Qatar. Additionally, this report points to the role of dromedary camels in supporting the enzootic cycle of Anaplasma transmission within the region. This report marks the first instance of camel anaplasmosis in Qatar. Surveillance of Anaplasma among susceptible hosts (animals and human) in Qatar is required for assessing the zoonotic potential.</p>","PeriodicalId":23329,"journal":{"name":"Tropical animal health and production","volume":"57 2","pages":"79"},"PeriodicalIF":1.7,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143504364","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of dietary supplementation on ingestive behavior and consumption of grazing sheep: a systematic review.","authors":"Gabriela Oliveira de Aquino Monteiro, Gelson Dos Santos Difante, Marcos Antonio Ferreira Júnior, Francisca Fernanda da Silva Roberto, Carolina Marques Costa Araújo, Hitalo Rodrigues da Silva, Juliana Caroline Santos Santana, Jéssica Gomes Rodrigues, Vanessa Zirondi Longhini, Camila Celeste Brandão Ferreira Ítavo, Luís Carlos Vinhas Ítavo","doi":"10.1007/s11250-025-04337-3","DOIUrl":"https://doi.org/10.1007/s11250-025-04337-3","url":null,"abstract":"<p><p>This study aimed to summarize the main information from published studies on the effects of dietary supplementation on the ingestive behavior and consumption of grazing sheep and to support efficient feeding strategies. The guiding question formulated based on the PICOS strategy was: Does dietary supplementation influence the ingestive behavior and voluntary forage consumption of sheep kept on pasture? Four databases were used: SCOPUS (Elsevier), Web of Science (main collection), Science Direct (Elsevier), and CAB Direct, and the search was carried out from January to July 2023. Only complete research articles, available in full, well-designed, and published in any language, with no time frame, were considered. A total of 8,132 documents were retrieved and after applying the eligibility criteria, 7 were considered eligible and included in the final sample. 28.6% evaluated ingestive behavior for 24 uninterrupted hours, 28.6% for 12 h, 14.3% for 11 h, and 28.6% for 9 h evaluated. The interval for observing behavior was every five minutes for 42.9% and every 10 min for 57.1% of the studies. The studies that evaluated grazing, rumination, and idle time, only 14% evaluated supplement intake time and water drinking time, 43% evaluated the bite rate, and 29% the bite mass. Among the methods for estimating dry matter intake (DMI), the most used were chromium oxide and titanium dioxide (42.5% each), and the estimate by formula corresponded to 14.29%. It was observed that 57.14% of the studies were published in national journals, the most used animal breed was Santa Inês (42.85%), and the most evaluated grazing method was continuous (57.14%). The use of supplementation, as well as the different levels and types of ingredients, influenced the ingestive behavior and voluntary dry matter intake of grazing sheep. By increasing the level of supplementation, the substitutive associative effect of the animals also increases the consumption of the supplement to the detriment of the pasture. Providing concentrated supplements with ingredients that have lower fiber content and higher TDN alters ingestive behavior, with a decrease in grazing and rumination time and an increase in idle time.</p>","PeriodicalId":23329,"journal":{"name":"Tropical animal health and production","volume":"57 2","pages":"81"},"PeriodicalIF":1.7,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143504360","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Physiological and behavioral responses of sows under different shading structures in a tropical free-range system.","authors":"Sheila Tavares Nascimento, João Victor do Nascimento Mós, Bruno Emanoel Teixeira, Bárbara Martins Passos, Luci Sayori Murata, Vinícius Machado Dos Santos, Evandro Menezes de Oliveira, Alex Sandro Campos Maia, Antonio José Steidle Neto","doi":"10.1007/s11250-025-04325-7","DOIUrl":"https://doi.org/10.1007/s11250-025-04325-7","url":null,"abstract":"<p><p>This study aimed to investigate the effect of different shade structures on the physiological and behavioral responses of sows in free-range systems in a tropical climate. Six non-pregnant DanBred sows were studied from November to December 2019 at the University of Brasília, Federal District, Brazil. The sows were distributed in a double 3 × 3 Latin square design in six paddocks, each containing one of the three artificial shade treatments, so that each artificial shade treatment was present in two paddocks. In each evaluated paddock there was a Caryocar Brasiliense, a native tree from Brazilian Cerrado with 6.0 m mean height, as well as a mud pool, to allow the sows to perform natural behaviors. Treatments included shade provided by a black net (blocking 80% of radiation), shade provided by a heat-reflective net (blocking 80% of radiation), and both nets combined. Black globe, dry bulb, and wet bulb temperatures, relative humidity, and wind speed were measured at 1 min intervals between 8:00 and 16:00 h during 18 non-consecutive days. For behavioral observation, an ethogram was developed describing sows' site preferences, body posture and activities of interest. Vaginal and body surface temperatures were measured every 1 min and respiratory rate every 20 min. Micrometeorological and physiological data were analyzed using SAS software. The means were compared using Tukey's test with a significance level of 5%. Behavioral data were subjected to frequency analysis and chi-square tests at the 5% significance level. Shade treatments affected (p < 0.05) all meteorological, behavioral, and physiological variables. The combined use of heat-reflective and black nets provided the best meteorological results, being more frequently used by sows than tree shade. However, shade type did not physiologically influence internal body temperature, surface temperature, or respiratory rate, demonstrating the importance of behavioral expression for thermoregulation.</p>","PeriodicalId":23329,"journal":{"name":"Tropical animal health and production","volume":"57 2","pages":"77"},"PeriodicalIF":1.7,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143493879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparative evaluation of lower respiratory tract microbiota in healthy and BRD-affected calves in Egypt.","authors":"Ibrahim Sabry, Mohamed Zeineldin, Mohamed Kamal, Abdelghany Hefnawy, Hussam El-Attar, Yasein Abdelraof, Mohamed Ghanem","doi":"10.1007/s11250-025-04322-w","DOIUrl":"10.1007/s11250-025-04322-w","url":null,"abstract":"<p><p>The advent of next-generation sequencing technologies has uncovered the importance of commensal microbial populations in the lower respiratory tract (LRT) for mucosal health and their role in the development of bovine respiratory disease (BRD). In this study, we aimed to characterize and compare the LRT microbiota in healthy and BRD-affected calves in Egypt. After assessing clinical respiratory scores in both groups, post-mortem lung samples from the cranial lobes of six clinically healthy calves and six calves affected by BRD were collected following slaughter. The most prevalent bacterial families in all samples were Moraxellaceae (11.06%), Enterobacteriaceae (8.23%), and Flavobacteriaceae (8.13%). The most common bacterial genera across all samples were Acinetobacter (13.1%), Gracilibacillus (7.9%), and Pseudomonas (5.0%). Notably, the overall microbial community structures differed significantly between healthy and BRD-affected calves. Alpha diversity analysis revealed significant differences in the Shannon (p = 0.0043) and Chao1 (p = 0.0001) indices between the two groups. This study highlights the substantial impact of BRD on the LRT microbiota of calves, highlighting the intricate relationship between host health and the LRT microbial ecosystem. Further investigations involving a larger sample size are necessary to establish the clinical significance of LRT microbiota in maintaining bovine respiratory health.</p>","PeriodicalId":23329,"journal":{"name":"Tropical animal health and production","volume":"57 2","pages":"78"},"PeriodicalIF":1.7,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11861120/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143493876","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}