Causes of Condemnations of Edible Parts of Slaughtered Pigs in Bavaria and Their Economic Implications: A Retrospective Survey (2021-2022)

This study aimed to provide insights into the main causes of postmortem carcass and organ condemnations in a pig slaughterhouse and evaluate the resulting financial impact of the rejection of edible parts of animals. A population of 307,866 pigs, admitted for slaughter between January 2021 and December 2022 in a Bavarian abattoir, was studied. Regarding the examined carcasses, 2.09% (n = 6422) presented pathological conditions. Of these, 8.12% (n = 522) and 91.88% (n = 5900) were totally and partially confiscated, respectively. The main reason for the complete rejection of carcasses was the occurrence of generalized diseases (62.6%), while the presence of abscesses and traumatic and/or tail lesions was the most frequently implicated (70.7%) in partial condemnations. In the case of the organs, 17.59% (n = 54,145) presented abnormalities, with distributions of 14.71% (n = 45,290), 1.94% (n = 5968), 0.72% (n = 2213), and 0.22% (n = 674) within the examined liver, lung, kidney, and heart specimens, respectively. The principal reasons for liver, lung, kidney, and heart condemnations were the occurrence of parasitic diseases (53.4%), bacterial/viral infections (63.5%), dystrophies/anomalies (98.4%), and bacterial/viral infections (98.5%), respectively. The total financial loss attributable to carcass and organ condemnations was estimated at EUR 392,744.2, which represents 0.40% of the total achievable net revenue without rejections. Of this, EUR 197,120 (0.20%) and EUR 195,624.2 (6.95%) were related to carcass and offal seizures, respectively. The study results offer useful information for veterinarians, stockowners, and epidemiologists to make and set up policies to increase the efficiency and benefits of the swine production system and protect public health.

Detection of porcine reproductive and respiratory syndrome virus type 2 in air emissions from grow-finish barns

BACKGROUND

Diagnosis of porcine reproductive and respiratory syndrome virus (PRRSV) infections can be accomplished using various sample types and testing methods.  The objective of this study was to evaluate the feasibility of using air emission samples to detect the onset of PRRSV type 2 infections in growing pigs.

METHODS

Air emissions and oral fluid samples were collected from three grow-finish barns, stocked with PRRSV-negative pigs every 2 weeks for 14-20 weeks. All samples were assayed for PRRSV using RT-PCR.

RESULTS

In all barns, PRRSV was initially detected in both air emissions and oral fluid samples at the same sampling event. Compared with oral fluids, air emissions collected subsequently yielded higher cycle threshold values and showed a lower likelihood of being RT-PCR positive.

LIMITATION

Sampling was limited to three grow-finish barns.

CONCLUSION

Air emission samples from pig barns are a biosecure and non-invasive sample type that is comparable to oral fluids for detection of the onset of PRRSV infection.

Progress in African Swine Fever Vector Vaccine Development

African swine fever (ASF) is a highly lethal, infectious, hemorrhagic fever disease, characterized by an acute mortality rate approaching 100%. It is highly contagious, and results in significant losses to the global hog industry as it spreads. Despite incremental progress in research on the African swine fever virus (ASFV), a safe and effective commercial vaccine has yet to be developed. Vector vaccines, a promising type of vaccine, offer unique advantages, and are a primary focus in ASFV vaccine research. This paper focuses on the characteristics of viral, bacterial, and yeast vector vaccines; elucidates the immunological mechanisms associated with antigens; lists the types of antigens that have significant potential; discusses the feasibility of using exogenously expressed cytokines to enhance the protective power of vector vaccines; and, finally, discusses the types of vectors that are commonly used and the latest advances in this field.

Lineage 7 Porcine Reproductive and Respiratory Syndrome Vaccine Demonstrates Cross-Protection Against Lineage 1 and Lineage 3 Strains

Background/Objectives: Porcine reproductive and respiratory syndrome virus (PRRSV) has a major impact on swine productivity. Modified-live vaccines (MLVs) are used to aid in control. We investigated the cross-protection provided by a lineage 7 PRRSV MLV against a lineage 1 isolate under laboratory conditions and a lineage 3 challenge under field conditions in Taiwan. Methods: In the first study, thirty PRRS antibody-negative conventional piglets were vaccinated via the intramuscular (IM) or the intradermal (ID) route, with the control group receiving a placebo. Four weeks after immunization, all groups were challenged with a Taiwanese lineage 1 strain. The standard protocol for detection of reversion to virulence was applied to the vaccine strain in the second study, using sixteen specific pathogen-free piglets. In the third study, on an infected pig farm in Taiwan (lineage 3 strain), three hundred piglets were randomly selected and divided into three groups, each injected with either the PrimePac® PRRS vaccine via the IM or the ID route, or a placebo. Results: In the first study, both vaccinated groups demonstrated reduced viraemia compared to the control group. The second study demonstrated that the MLV strain was stable. In the third study, piglet mortality, average daily weight gain, and pig stunting rate were significantly improved in the vaccinated groups compared to the control group. Conclusions: PrimePac® PRRS is safe to use in the field in the face of a heterologous challenge, successfully providing cross-protection against contemporary lineage 1 and lineage 3 PRRSV strains from Taiwan.

A simple and rapid evaluation of boar sperm quality using the resazurin colorimetric assay

Ensuring boar sperm quality before insemination is crucial for maximizing field fertility and efficient pig production. The computer-assisted sperm analysis (CASA) and fluorescence probes combined with flow cytometry (FC) are commonly used techniques for evaluating sperm kinematics and functions, closely related to animal fertility. However, their high cost and complex operations make it challenging to apply them in laboratories or pig breeding farms with limited resources. Here, our aim was to develop a new protocol using a resazurin redox dye to assess boar sperm quality for practical application. We first created simulated semen samples with different levels of sperm quality (0, 20, 40, 60, 80, 100%) at concentrations of 300 and 150 × 106 cells/mL. Subsequently, the simulated semen was used to establish an optimal standard protocol based on the results of the resazurin colorimetric assay. Finally, the condition that showed the strongest correlation between resazurin redox rate and sperm parameters was selected to perform a linear regression test. Two optimal working conditions were identified, involved incubating 10 µL of resazurin reagent with 100 µL of semen for either 20 or 40 min, depending on the sperm concentration of either 300 or 150 × 106 cells/mL. We subsequently conducted a linear regression analysis using data that included the resazurin reaction rate and measurements of sperm parameters. Finally, we obtained two sets of five equations, allowing directly convert the absorbance of the resazurin assay into values for sperm quality parameters. These parameters include total motility, progressive motility, viability, acrosome integrity, and mitochondrial activity. This new protocol is valuable for sperm evaluation because it is cost-effective, time-efficient, and labor-saving.

Overcoming barriers and understanding the psychological impact of timely pig euthanasia on Spanish-speaking swine caretakers in the United States

Introduction

This study explores the complex experiences of Spanish-speaking swine caretakers with euthanasia, focusing on mental health, stress, burnout, and the impact of cultural factors.

Methods

We conducted qualitative focus groups with Spanish-speaking swine caretakers from multiple farms, gathering insights from individuals with varying levels of experience and cultural backgrounds. Data were analyzed using thematic analysis to identify key factors influencing the euthanasia process.

Results

The study found that caretaker stress and burnout, exacerbated by the "caring-killing paradox," significantly affect emotional wellbeing. Factors such as the frequency of euthanasia, level of knowledge and education, and cultural background were identified as influential. Caretakers performing euthanasia frequently showed signs of desensitization, while those with less experience experienced higher emotional distress. Cultural background influenced attitudes and decision-making regarding euthanasia.

Discussion

This research underscores the need for mental health support and culturally sensitive training programs for swine caretakers. The findings align with existing literature on occupational stress and burnout and highlight the importance of comprehensive support systems. Future research should further examine the psychological impact of euthanasia across diverse agricultural settings and develop targeted interventions to support caretakers' mental health and improve animal welfare practices.

Towards developing multistrain PEDV vaccines: Integrating basic concepts and SARS-CoV-2 pan-sarbecovirus strategies

Porcine epidemic diarrhea virus (PEDV) is a major pathogen impacting the global pig industry, with outbreaks causing significant financial losses. The genetic variability of PEDV has posed challenges for vaccine development since its identification in the 1970s, a problem that intensified with its global emergence in the 2010s. Since current vaccines provide limited cross-protection against PEDV strains, and the development of multistrain PEDV vaccines remains an underexplored area of research, there is an urgent need for improved vaccine solutions. The rapid development of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) vaccines and ongoing pan-sarbecovirus vaccine research, have demonstrated the potential of next-generation vaccine platforms and novel antigen design strategies. These advancements offer valuable insights for the development of multistrain PEDV vaccines. This review summarizes key aspects of PEDV virology and explores multistrain vaccine development considering SARS-CoV-2 vaccine innovations, proposing a framework for developing next-generation PEDV vaccine solutions.

Comparison of Vaccination Regimens on Immune Responses Using PED Replicon Vaccine: A Field Trial in PED-Negative and PED-Positive Thai Swine Farms

Porcine epidemic diarrhea virus (PEDV) is an economically important pathogen of swine, causing severe diarrhea in neonates with high morbidity and mortality. Vaccination is a key strategy for PEDV control, but optimizing regimens based on herd status is essential for improving immunity and protection. This study evaluated immune responses to different vaccination protocols using a PED replicon vaccine (PED-RP) in Thai swine farms with varying PED statuses. Two field trials were conducted: Experiment 1 (n = 120) on a PED-negative farm used a killed vaccine followed by PED-RP, while Experiment 2 (n = 42) on a PED-positive farm used a modified-live vaccine (MLV) followed by PED-RP. In Experiment 1, gilts boosted with PED-RP during gestation showed significantly higher colostrum IgA levels compared to those receiving two doses of the killed vaccine. In Experiment 2, priming with MLV followed by PED-RP resulted in increased neutralizing antibody titers and seropositivity, outperforming the MLV-only regimen after acclimatization. These findings suggest that using PED-RP as a booster can enhance serum and lactogenic immunity, providing a promising strategy for improving immune responses in both PED-negative and PED-positive herds. The study highlights the importance of tailored vaccination strategies to optimize herd immunity and protect piglets from PEDV.

Towards Detecting Associations of Canine Astrovirus and Caliciviruses with Health and Living Characteristics of Dogs in Greece

Astroviruses and caliciviruses are important causative agents of gastroenteritis in humans worldwide. They have been detected in a variety of animal species, including dogs, but their role in the induction of disease in animals remains uncertain. In a molecular study that was conducted in Greece, including healthy and gastroenteritis-affected dogs of different ages, astrovirus (AstV) and sapovirus (SaV) were detected in 15% and 26% of the examined animals, respectively. A specialized questionnaire was filled out for each of the dogs participating in the study, including information about different characteristics and risk factors that could possibly affect their health status. This information was analyzed with the use of two innovative statistical methods, i.e., a Multiple Correspondence Analysis (MCA) and the Ascending Hierarchical Classification (AHC). Based on their results, it was possible to define various groups of dogs based on their characteristics. AstV seems to occur more often in low-health-status dogs, usually mongrels, living in rural areas, showing vomit, diarrhea, and diet changes. Dogs of this group usually live with other pets in the same household and have frequent contact with stray animals. The presence of SaV does not seem to be associated with any of the examined factors.

Pig nasal and rectal microbiotas are involved in the antibody response to Glaesserella parasuis

Vaccination stands as one of the most sustainable and promising strategies to control infectious diseases in animal production. Nevertheless, the causes for antibody response variation among individuals are poorly understood. The animal microbiota has been shown to be involved in the correct development and function of the host immunity, including the antibody response. Here, we studied the nasal and rectal microbiota composition in association with the antibody response against the pathobiont Glaesserella parasuis. The nasal and rectal microbiotas of 24 piglets were sampled in two farms before vaccination and in one unvaccinated farm (naturally exposed to the pathobiont) at similar time. Microbiota composition was inferred by V3V4 16S rRNA gene sequencing and bioinformatics analysis, and the antibody response was quantified using the variation between the levels before and after vaccination (normalized per farm). Piglets with higher antibody responses showed more diverse nasal and rectal microbial communities compared to piglets with lower responses. Moreover, swine nasal core microbiota colonizers were associated with higher antibody levels, such as several members from Bacteroidales and Clostridiales orders and genera including Moraxella, Staphylococcus, Fusobacterium and Neisseria. Regarding taxa found in the rectal microbiota, associations with antibody responses were detected only at order level, pointing towards a positive role for Clostridiales while negative for Enterobacteriales. Altogether, these results suggest that the microbiota is associated with the antibody response to G. parasuis (and probably to other pathogens) and serves as starting point to understand the factors that contribute to immunization in pigs.

Screening for transcriptomic associations with Swine Inflammation and Necrosis Syndrome

BACKGROUND

The recently identified swine inflammation and necrosis syndrome (SINS) affects tail, ears, teats, coronary bands, claws and heels of affected individuals. The primarily endogenous syndrome is based on vasculitis, thrombosis, and intimal proliferation, involving defence cells, interleukins, chemokines, and acute phase proteins and accompanied by alterations in clinical chemistry, metabolome, and liver transcriptome. The complexity of metabolic alterations and the influence of the boar led to hypothesize a polygenic architecture of SINS. This should be investigated by a transcriptome study. For this purpose, the three to five least affected (SINS-low) and most SINS affected (SINS-high) 3d-old piglets, each of three boars, a relatively SINS stable Duroc boar (DU), a relatively stable Pietrain boar (PI+) and a highly susceptible Pietrain boar (PI-) were selected from 27 litters of mixed semen to minimize environmental effects.

RESULTS

A genome-wide expression experiment revealed a huge set of differentially expressed genes that are involved in vasculitis, inflammation and necrosis, keratinization and erythrocyte epitopes. Among them were CRP, GYPA, S100A12, and LIPK. The results confirm and complement previous studies to this topic.

CONCLUSIONS

The results confirm the outstanding importance of defence in the context of SINS. At the same time, for the first time, there is evidence for a direct involvement of the keratinisation capacity of the skin and various epitopes of the erythrocyte membrane, which seem to be associated with the severity of SINS. These genes could serve to clarify the pathogenesis of the syndrome and to develop diagnostic tools in future studies.

Nasal microbial diversity is associated with survival in piglets infected by a highly virulent PRRSV-1 strain

BACKGROUND

Porcine reproductive and respiratory syndrome virus (PRRSV) is a major threat to swine industry worldwide, especially virulent variants arising during the last years, such as Spanish PRRSV-1 Rosalia strain. The role of the nasal microbiota in respiratory viral infections is still to be unveiled but may be promisingly related with the health status of the animals and thus, their susceptibility. The goal of this project was to study the nasal microbiota composition of piglets during a highly virulent PRRSV-1 outbreak comparing animals that died due to the infection with animals that survived it. The microbiota composition was inferred by V3-V4 regions of the 16S rRNA gene sequencing and bioinformatics analysis. To deepen the analysis, we added samples taken from piglets before the outbreak as well as from the sows giving birth to piglets under study.

RESULTS

Piglets that survived the PRRSV-1 outbreak reported a more diverse and different nasal microbiota at three weeks of age compared to piglets dying, which was highly related with the litter of origin and the sow of the piglets. In addition, a high abundance of classical swine nasal colonizers belonging to genera such as Bergeyella, Glaesserella, Neisseria and Moraxella (among others), was related with good outcome. On the other hand, a dysbiotic community dominated by Escherichia and a different clade of Moraxella was found in piglets with bad outcome. Moreover, samples taken before the outbreak showed similar dynamics prior to virulent PRRSV-1 arrival, suggesting that microbiota-related susceptibility was already occurring in the animals and that the increase in mortality seen was related to the new highly virulent strain.

CONCLUSION

Our study suggests that the susceptibility to an infection such as PRRSV could be related to the nasal microbiota composition at the moment of infection and may serve as starting point to explore animal resilience. Since the dysbiosis detected as an initial response to infection may be not specific for this virus, further investigations should explore this phenomenon in the context of other viral infections.

Ethyl caffeate as a novel targeted inhibitor of 3CLpro with antiviral activity against porcine epidemic diarrhea virus

Porcine epidemic diarrhea virus (PEDV) can cause severe diarrhea death in newborn piglets, resulting in significant economic losses for the pig industry. Therefore, the advancement of safe and effective anti-PEDV drugs for the treatment of PEDV is of paramount importance. In this study, molecular docking was used to screen natural drugs that can target PEDV 3C like protease (3CLpro). As well, the anti-PEDV effects of the screened drugs were evaluated in vitro and in vivo. Molecular docking and molecular dynamics (MD) simulation results showed that ethyl caffeate (EC) could efficiently bind to the active cavity of PEDV 3CLpro. Biolayer interferometry (BLI) and fluorescence resonance energy transfer (FRET) analyses demonstrated that EC directly interacts with PEDV 3CLpro (KD = 1650 μM) and inhibits the activity of 3CLpro (IC50 = 33.87 μM). EC has been shown to significantly inhibit the replication of PEDV in Vero E6 cells. The half maximal inhibitory concentration (CC50) and half-effective concentration (EC50) were determined to be 283.1 μM and 8.641 μM, respectively, yielding a selectivity index as high as 32.7. Furthermore, EC was evaluated using a piglet infection model for PEDV. It demonstrated the ability to inhibit PEDV infection in vivo and improve the survival rate of piglets (3/5, 60%). Compared to the control group, oral administration of EC significantly reduced intestinal pathological damage and viral load. Our study indicated that EC, targeting PEDV 3CLpro, is a safe and effective anti-PEDV drug with promising clinical application prospects.

Prevalence and molecular characterisation of Balantioides coli in pigs raised in Italy

Balantioides coli is the only ciliated protist of both human and veterinary interest and colonises the large intestine of several hosts, including humans and pigs. Given the scarcity of data on B. coli circulation in pigs in Italy, a study was planned to record its prevalence and genetic types and compare the analytical sensitivity of two copromicroscopic techniques. For this purpose, 880 faecal samples were collected from pigs raised in 22 farms located in northern Italy and analysed with the sedimentation and the FLOTAC® dual technique, employing sodium chloride and zinc sulphate flotation solutions, and the Cohen's kappa coefficient was calculated to assess the agreement between these methods. Conventional PCR to amplify the ribosomal internal transcribed spacer region (ITS) was subsequently performed on 22 samples, one for each farm, which were positive for B. coli cysts by sedimentation; when more than one sequence was detected in the chromatograms, the PCR products were cloned. Overall, 813 samples were positive for B. coli cysts by sedimentation (92.4%), and moderate concordance with the zinc-based FLOTAC® technique was observed, whereas the agreement was slight with the salt-based FLOTAC® technique. Among the 22 sequenced samples, type B was amplified in 19 samples, type A in two samples, and both A and B types were co-expressed in one sample. This study demonstrated a high prevalence of B. coli in Italian pigs; further insights are needed to trace its distribution and genetic polymorphism in other pig production categories and in humans, defining its public health significance.

Elegant and Innovative Recoding Strategies for Advancing Vaccine Development

Recoding strategies have emerged as a promising approach for developing safer and more effective vaccines by altering the genetic structure of microorganisms, such as viruses, without changing their proteins. This method enhances vaccine safety and efficacy while minimizing the risk of reversion to virulence. Recoding enhances the frequency of CpG dinucleotides, which in turn activates immune responses and ensures a strong attenuation of the pathogens. Recent advancements highlight synonymous recoding's potential, offering improved genetic stability and immunogenicity compared to traditional methods. Live vaccines attenuated using classical methods pose a risk of reversion to virulence and can be time-consuming to produce. Synonymous recoding, involving numerous codon alterations, boosts safety and vaccine stability. One challenge is balancing attenuation with yield; however, innovations like Zinc-finger antiviral protein (ZAP) knockout cell lines can enhance vaccine production. Beyond viral vaccines, recoding can apply to bacterial vaccines, as exemplified by modified Escherichia coli and Streptococcus pneumoniae strains, which show reduced virulence. Despite promising results, challenges like ensuring genetic stability, high yield, and regulatory approval remain. Briefly, ongoing research aims to harness these innovations for comprehensive improvements in vaccine design and deployment. In this commentary, we sought to further engage the community's interest in this elegant approach by briefly highlighting its main advantages, disadvantages, and future prospects.

Data recording and use of data tools for pig health management: perspectives of stakeholders in pig farming

Introduction

Data-driven strategies might combat the spreading of infectious pig disease and improve the early detection of potential pig health problems. The current study aimed to explore individual views on data recording and use of data tools for pig health management by recruiting stakeholders (N = 202) in Spain, Ireland, and the Netherlands.

Methods

Questionnaire focused on current on-farm challenges, current status of data recording on farms, and evaluation of the two mock data tools. Particularly, "benchmarking tool" was designed to visualize individual farm's pig mortality, targeting the management of infectious respiratory and gastrointestinal diseases; and "early-warning tool" was designed to generate an alarm through monitoring coughs in pigs, targeting the management of infectious respiratory diseases.

Results

Results showed that respiratory and gastrointestinal diseases and aggressive behaviors were the most frequently mentioned health challenge and welfare challenge, respectively. Most of the data was more frequently recorded electronically than on paper. In general, the "benchmarking tool" was perceived as useful for the management of infectious respiratory and gastrointestinal diseases, and the "early-warning tool" was evaluated as useful for the management of infectious respiratory diseases. Several barriers to the perceived usefulness of these two tools were identified, such as the lack of contextual information, inconvenience of data input, limited internet access, reliance on one's own experience and observation, technical hurdles, and mistrust of information output. The perceived usefulness of both tools was higher among highly educated participants, and those who reported being integrators and positive toward technology for disease control. Female participants and those who came from integrated farms evaluated the "early-warning tool" as more useful compared to their counterparts. The perceived usefulness of the "early-warning tool" was negatively affected by age and work experience, but positively affected by extensiveness of data recording, positive attitude toward technology, and the current use of technology.

Discussion

In summary, participants showed optimistic views on the use of data tools to support their decision-making and management of infectious pig respiratory and gastrointestinal diseases. It is noteworthy that data tools should not only convey the value of data for informed decision-making but also consider stakeholders' preconditions and needs for data tools.

Genetic structure and diversity of Mycoplasma hyopneumoniae based on a MLVA typing scheme

Background

Several epidemiological studies have been carried out using Multiple-Locus Variable-number tandem repeat Analysis (MLVA) for M. hyopneumoniae typing. However, a global perspective on the implications of the genetic diversity of this pathogen is lacking.

Objective

This study aimed to determine and to analyze the genetic structure of M. hyopneumoniae based on the p97R1-p146R3 MLVA typing scheme and to characterize, analyze and compare MLVA types among countries where the information was publicly available.

Methods

A set of 797 publicly available data of M. hyopneumoniae p97R1-p146R3 MLVA genetic types from six different countries were analyzed using Genalex 6.41 software to characterize loci polymorphism and using Structure 2.3.4 software in order to identify the genetic structure.

Results

A total of 185 MLVA types were identified among the analyzed data. For the p97R1 and p146R3 loci, most of the molecular variation in M. hyopneumoniae populations was identified within countries. Three genetic clusters and their recombinations were identified globally.

Conclusion

M. hyopneumoniae is a genetically diverse pathogen with limited clonality and three well-defined clusters and their combinations were identified in this investigation. The greatest genetic variation of M. hyopneumoniae was observed within countries.

Drivers and barriers to the choice of production systems among smallholder pig farmers: Evidence from Northern Uganda

Pork consumption has risen significantly in many emerging nations, prompting diverse pig production systems. This study explored the drivers and barriers to the choices of pig production systems and the challenges confronting pig farmers in Northern Uganda. Data were collected from 240 pig farmers using a structured questionnaire and analyzed using multinomial logit regression. Results revealed that 38.8 % of the pig farmers practiced the farrow-to-weaner (breeding) production system. Further, years of farming experience, access to extension service, number of initial stocks, and gender significantly influenced the choice of the farrow to finish production system. Significant predictors for the weaner-to-slaughter (fattening) system were market proximity, years of farming experience, household size, number of initial stocks, and access to extension service. It is recommended that extension services be enhanced and tailored to specific production systems, with a focus on breeding management, feeding practices, and marketing strategies to better support pig farmers. Further, investments should be made in transportation infrastructure to facilitate direct farm-to-market linkages for pig farmers.

Effect of Time and Temperature on the Detection of PRRSV RNA and Endogenous Internal Sample Control in Porcine Tongue Fluids

Population-based sampling has improved pathogen monitoring in the US swine industry by increasing sensitivity while reducing costs. Postmortem tongue fluids (TF) have emerged as a practical option for monitoring porcine reproductive and respiratory syndrome virus (PRRSV) in breeding herds, but limited data exist on optimal storage conditions. This study evaluated PRRSV RNA detection via RT-qPCR in TF samples under various storage times, temperatures, and viral loads. Additionally, the porcine endogenous reference gene (internal sample control, ISC) was assessed for monitoring sample quality. Three studies were conducted: Study 1 compared fresh TF samples to freeze-thaw TF samples, with significantly lower cycle threshold (Ct) values in fresh samples. Studies 2 and 3 evaluated PRRSV RNA stability across six time points (0 to 336 h) and four temperatures (-20 °C, 4 °C, 22 °C, and 34 °C). At 4 °C, Ct value variation was minimal (≤1.1) over 14 days (336 h), with no significant changes within 48 h. In contrast, storage at 22 °C and 34 °C resulted in increased Ct values. The ISC RNA showed similar stability patterns, maintaining quality at 4 °C but degrading at higher temperatures. In conclusion, storing TF at ≤4 °C for up to 14 days for PRRSV and ISC RNA detection is the best scenario, ensuring optimal diagnostic quality.

Assessing the detection and interaction of Lawsonia intracellularis and porcine circovirus 2 in low and high-performance wean-to-finish pig groups in different porcine reproductive and respiratory syndrome virus detection scenarios

Introduction

Effective disease management strategies are essential for achieving optimal pig performance, ensuring high-quality animal health and welfare, and maintaining the economic viability of swine systems. Thus, understanding factors that lead to more or less severe disease are critically important. Porcine circovirus type 2 (PCV2) and Lawsonia intracellularis (L. intracellularis) are endemic pathogens in the U.S., affecting herds with varying degrees of subclinical and clinical disease and impact on performance. While these are common pathogens, their interaction with PRRSV and performance has seldom been investigated. This study investigated the detection dynamics of L. intracellularis, PRRSV, and PCV2, and their association with productivity impacts in wean-to-finish groups within a Midwest U.S. production system.

Methodology

This observational field study involved batches of growing pigs from PRRSV-stable or PRRSV-negative sow farms. Oral fluids were collected longitudinally from weaning until market age, and tested using quantitative PCR for each of the aforementioned pathogens. The study included 36 batches with a total of 46,446 growing pigs, resulting in 4,000 oral fluid samples. Then, batches were categorized based on key performance indicators (mortality and average daily gain), PRRSV detection timing and total genomic copies of each pathogen.

Results

Nineteen groups were characterized as high-performance and seventeen as low-performance. Mortality ranged from 5 to 9% in high-performance groups and 10.3-20.9% in low-performance groups. Average daily gain ranged from 0.68-0.86 kg in high-performance groups and 0.63-0.81 kg in low-performance groups. L. intracellularis and PCV2 were detected in most groups, with significant differences in detection rates between high and low-performance groups. Groups with relatively high genomic copies of PCV2 and L. intracellularis that had PRRSV detection presented higher mortality rates (15.75%).

Discussion

This study expanded our understanding of PRRSV, PCV2, and L. intracellularis co-detections and their impact on swine populations.

Resistance to medically important antimicrobials in broiler and layer farms in Cameroon and its relation with biosecurity and antimicrobial use

Introduction

Poultry production accounts for 42% of Cameroonian meat production. However, infectious diseases represent the main hindrance in this sector, resulting in overuse and misuse of antimicrobials that can contribute to the emergence and dissemination of antimicrobial resistance (AMR). This study aimed to evaluate the prevalence of antimicrobial resistance genes (ARGs) conferring resistance to carbapenems (blaVIM-2 and blaNDM ), (fluoro) quinolones (qnrS, qnrA, and qnrB), polymyxins (mcr1 to mcr5), and macrolides (ermA and ermB) in the poultry farm environment. Additionally, the study examined the relationship between these ARGs and biosecurity implementation, as well as farmers' knowledge, attitudes, and practices toward antimicrobial use (AMU) and AMR, including their perception of AMR risk.

Materials and methods

Fecal, drinking water, and biofilm samples from drinking water pipelines were collected from 15 poultry farms and subsequently analyzed by real-time PCR and 16S rRNA NGS.

Results

All samples tested positive for genes conferring resistance to (fluoro) quinolones, 97.8% to macrolides, 64.4% to polymyxins, and 11.1% to carbapenems. Of concern, more than half of the samples (64.4%) showed a multi-drug resistance (MDR) pattern (i.e., resistance to ≥3 antimicrobial classes). Drinking water and biofilm microbial communities significantly differed from the one of the fecal samples, both in term of diversity (α-diversity) and composition (β-diversity). Furthermore, opportunistic pathogens (i.e., Comamonadaceae and Sphingomonadaceae) were among the most abundant bacteria in drinking water and biofilm. The level of biosecurity implementation was intermediate, while the knowledge and attitude of poultry farmers toward AMU were insufficient and unsuitable, respectively. Good practices toward AMU were found to be correlated with a reduction in polymyxins and MDR.

Discussion

This study provides valuable information on resistance to medically important antimicrobials in poultry production in Cameroon and highlights their potential impact on human and environmental health.

Probiotic Characterization of Lactic Acid Bacteria from Donkey Feces in China

Probiotics are beneficial to humans and animals and often used for regulating immunity, intestinal microbiota balance, and animal growth performance. Donkey husbandry has boomed in China in recent years and there is an urgent need for probiotics effective for improving donkey health. However, studies on potential probiotic strains isolated from donkeys are scarce. This project aimed to screen LAB strains from donkey feces, detect their antimicrobial activity and evaluate their probiotic characteristics in vitro. Thirteen LAB isolates showed different degrees of antimicrobial activity against four indicator bacteria: three common pathogens (Escherichia coli, Staphylococcus aureus, and Salmonella typhimurium) and one pathogen restricted to equines (Salmonella. abortus equi), eight of which could inhibit all four pathogens. Seven isolates showed higher tolerance to low pH and bile salts, with >50% and >60% survival rates, respectively. Five of them had more than 50% survival rate to artificial gastric and intestinal fluids. Only three isolates possessed good properties, with >40% auto-aggregation, >40% hydrophobicity, and high co-aggregation with the indicator pathogens. An L9 isolate, identified as Ligilactobacillus salivarius, was sensitive to most antibiotics tested. Overall, these results indicate that the L. salivarius L9 isolate meets the requirements of the probiotics selection criteria in vitro and can potentially be developed as a probiotic for donkeys.

Retrospective exploratory evaluation of individual pigs' behaviour involved in tail biting during rearing and fattening

Tail biting is one of the biggest welfare problems in pigs. However, depending on the individuals involved (e.g., tail biter/victim), pigs seem to change their behaviour prior to tail biting events, which raises the possibility of early detection and thus prediction and prevention of tail biting. In this retrospective explorative study, we used datasets from four different studies with 9 trials of rearing (4 pens/trial with 24 pigs/pen) and fattening (8 pens/trial with 12 pigs/pen) that focused on the exploration behaviour of undocked pigs towards plant-based enrichment materials. From this dataset, we identified 8 pens from rearing (n = 192 pigs) and 6 pens from fattening (n = 72 pigs) in which individual tail biters were identified. From this dataset, we investigated whether any a priori behavioural changes in exploration or feeding could be identified with respect to tail biting. Furthermore, the effects of weight parameters from suckling to fattening were examined. Using linear mixed effects models, we found that exploration duration was linked to days prior to tail biting in rearing, depending on CatPig (category of pigs: biter, victim, neutral pig) (P = 0.001), in fattening independent of CatPig (P<0.0001), and by duration, amount and frequency of feed consumption in fattening (P<0.0001). Some weight parameters covaried with CatPig in rearing (weight-gain suckling: P = 0.0018; weaning weight: P = 0.019) and fattening (weaning weight: P = 0.07; start weight at fattening: P = 0.03; weight-gain rearing: P = 0.02). Suitable indicators for future early detection trials of tail biting could be exploration duration in rearing and fattening and feeding data in fattening. Moreover, weight parameters in rearing and fattening and exploration duration in rearing may be used to identify individual pigs that might become tail biters in an upcoming tail biting event. The retrospective explorative nature of our analysis revealed interesting patterns; however, further studies are needed to confirm our findings.

Scoring of swine lung images: a comparison between a computer vision system and human evaluators

Cranioventral pulmonary consolidation (CVPC) is a common lesion observed in the lungs of slaughtered pigs, often associated with Mycoplasma (M.) hyopneumoniae infection. There is a need to implement simple, fast, and valid CVPC scoring methods. Therefore, this study aimed to compare CVPC scores provided by a computer vision system (CVS; AI DIAGNOS) from lung images obtained at slaughter, with scores assigned by human evaluators. In addition, intra- and inter-evaluator variability were assessed and compared to intra-CVS variability. A total of 1050 dorsal view images of swine lungs were analyzed. Total lung lesion score, lesion score per lung lobe, and percentage of affected lung area were employed as outcomes for the evaluation. The CVS showed moderate accuracy (62-71%) in discriminating between non-lesioned and lesioned lung lobes in all but the diaphragmatic lobes. A low multiclass classification accuracy at the lung lobe level (24-36%) was observed. A moderate to high inter-evaluator variability was noticed depending on the lung lobe, as shown by the intraclass correlation coefficient (ICC: 0.29-0.6). The intra-evaluator variability was low and similar among the different outcomes and lung lobes, although the observed ICC slightly differed among evaluators. In contrast, the CVS scoring was identical per lobe per image. The results of this study suggest that the CVS AI DIAGNOS could be used as an alternative to the manual scoring of CVPC during slaughter inspections due to its accuracy in binary classification and its perfect consistency in the scoring.

Analysis of whole transcriptome reveals the immune response to porcine reproductive and respiratory syndrome virus infection and tylvalosin tartrate treatment in the porcine alveolar macrophages

Introduction

Porcine reproductive and respiratory syndrome virus (PRRSV) is a major pathogen that has caused severe economic losses in the swine industry. Screening key host immune-related genetic factors in the porcine alveolar macrophages (PAMs) is critical to improve the anti-virial ability in pigs.

Methods

In this study, an in vivo model was set to evaluate the anti-PRRSV effect of tylvalosin tartrates. Then, strand-specific RNA-sequencing (ssRNA-seq) and miRNA-sequencing (miRNA-seq) were carried out to profile the whole transcriptome of PAMs in the negative control, PRRSV-infected, and tylvalosin tartrates-treatment group.

Results

The ssRNA-seq identified 11740 long non-coding RNAs in PAMs. Based on our attention mechanism-improved graph convolutional network, 41.07% and 28.59% lncRNAs were predicted to be located in the nucleus and cytoplasm, respectively. The miRNA-seq revealed that tylvalosin tartrates-enhanced miRNAs might play roles in regulating angiogenesis and innate immune-related functions, and it rescued the expression of three anti-inflammation miRNAs (ssc-miR-30a-5p, ssc-miR-218-5p, and ssc-miR-218) that were downregulated due to PRRSV infection. The cytoplasmic lncRNAs enhanced by tylvalosin tartrates might form ceRNA networks with miRNAs to regulate PAM chemotaxis. While cytoplasmic lncRNAs that were rescued by tylvalosin tartrates might protect PAMs via efferocytosis-related ceRNA networks. On the other hand, the tylvalosin tartrates-rescued nuclear lncRNAs might negatively regulate T cell apoptosis and bind to key anti-inflammation factor IL37 to protect the lungs by cis- and trans-regulation.

Conclusions

Our data provides a catalog of key non-coding RNAs in response to PRRSV and tylvalosin tartrates and might enrich the genetic basis for future PRRSV prevention and control.

The Role of Nutrition Across Production Stages to Improve Sow Longevity

Modern hyperprolific sows are increasingly susceptible to health challenges. Their rapid growth rates predispose them to locomotor disorders, while high metabolic demands, reduced backfat thickness, and increased protein accretion heighten their vulnerability to heat stress and dystocia. Additionally, prolonged farrowing negatively affects the oxidative and inflammatory status of these females. Additionally, prevalent conditions such as gastric ulcers and cystitis raise ethical, welfare, and economic concerns. Despite the several studies related to sow nutrition, there are no studies which compile and extrapolate nutrition approaches from the rearing period and their impact on sows' health and longevity. Also, the aim of our review was to shed light on gaps that require further investigation. Controlling body condition scores is crucial for maximizing productivity in sows. During gestation, high-fiber diets help maintain optimal body condition and prevent constipation, particularly during the peripartum period. Antioxidants offer a range of beneficial effects during this critical phase. Additionally, probiotics and acidifiers can enhance gut health and lower the risk of genitourinary infections. On the day of farrowing, energy supplementation emerges as a promising strategy to reduce farrowing duration. Collectively, these strategies address major health challenges, enhancing welfare and promoting sow's longevity.

Adaptive immune response to a wild boar-derived recombinant hepatitis e virus capsid protein challenge in pigs

Hepatitis E virus genotype 3 (HEV-3) is a zoonotic pathogen capable of infecting human, porcine, and other animal hosts. Despite a broad host range and abundance of species that act as reservoirs for human infections, no commercially available animal vaccines against HEV-3 are currently available. In the present study, we tested the capacity of recombinant aa 112-608 wild boar-derived HEV-3 capsid protein (rORF2p) to induce an immune response in immunized pigs. Four 6 week old pigs were administered 1 ml of 200 μg/ml rORF2p, followed by booster administration after 14 days. Blood samples were collected until 28 days after initial immunization. Dominant cell phenotypes and anti-HEV IgG concentrations were determined. A significant anti-HEV IgG, monocyte/macrophage, B cell and T cell response has been detected in immunized pigs. In turn, our findings suggest the capacity of rORF2p to elicit an immune response in pigs, suggesting the potential for its use as a vaccine candidate.

The Bacterial and pathogenic landscape of African buffalo (Syncerus caffer) whole blood and serum from Kenya

BACKGROUND

African buffalo (Syncerus caffer) is a significant reservoir host for many zoonotic and parasitic infections in Africa. These include a range of viruses and pathogenic bacteria, such as tick-borne rickettsial organisms. Despite the considerations of mammalian blood as a sterile environment, blood microbiome sequencing could become crucial for agnostic biosurveillance. This study investigated the blood microbiome of clinically healthy wild buffaloes in Kenya to determine its applicability in agnostic testing for bacteria in apparently healthy wild animals.

METHODS

Whole blood and serum samples were collected from 46 wild African buffalos from Meru National Park (30), Buffalo Springs (6) and Shaba (10) National Reserves in upper eastern Kenya. Total deoxyribonucleic acid (DNA) was extracted from these samples and subjected to amplicon-based sequencing targeting the 16 S rRNA gene. The bacteria operational taxonomic units (OTU) were identified to species levels by mapping the generated V12 and V45 regions of 16 S rRNA gene to the SILVA database. These OTU tables were used to infer the microbial abundance in each sample type and at the individual animal level. The sequences for the corresponding OTUs were also used to generate phylogenetic trees and thus infer evolution for the OTUs of interest.

RESULTS

Here, we demonstrate that buffaloes harbor many bacteria in their blood. We also report a diversity of 16 S rRNA gene sequences for Anaplasma and Mycoplasma from individual animals. By sequencing both whole blood and serum in triplicate for each animal, we provide evidence of the differences in detecting bacteria in both sample types.

CONCLUSIONS

Diverse bacteria, including some potential pathogens, can be found in the blood of clinically healthy wild African buffalo. Agnostic surveillance for such pathogens can be achieved through blood microbiome sequencing. However, considerations for the question being asked for the blood microbiome in wildlife will impact the choice for using whole blood or serum for sequencing.

A scoping review of studies reporting biosecurity practices in small and backyard farms raising livestock or poultry in developed countries, 2000-2022

Over the past two decades, there have been growing concerns around small and backyard farms in developed countries due to the potential risk they pose in introducing and spreading infectious disease agents. Ensuring high levels of biosecurity on these farms, through the maintenance of practices that prevent the introduction and transmission of disease agents, is essential in mitigating this risk. The aim of this study was to investigate, through a scoping review, the practices considered in articles reporting biosecurity in small and backyard farms raising livestock or poultry in developed countries, and how their implementation was examined. Eligibility criteria for inclusion of studies in this scoping review were based on population (small, hobby or backyard farms raising livestock or poultry), geographical location (developed countries), outcome (reported the implementation of biosecurity practices at the farm-level), study type (peer-reviewed primary research articles), and publication year (2000-2022). The databases searched included CAB Abstracts, MEDLINE, Scopus, AGRIS, and AGRICOLA. Two independent researchers screened abstracts and titles, and subsequently full texts for inclusion of studies. The data extracted from the full texts consisted of: (1) publication year; (2) journal; (3) definitions of "small," "backyard," and "hobby" used by authors; (4) study design and number of participants; (5) biosecurity practices assessed; (6) livestock and poultry species raised; and (7) geographical location. A total of 46 articles met the inclusion criteria. Almost all the included articles involved a questionnaire-based study (n = 44), and a majority of articles focused on poultry (n = 27) or swine (n = 11). Most of the articles were published after 2010 (n = 37). Among the 21 categories of biosecurity practices included, the most frequently reported were the introduction of new animals, contact with other domestic animals, measures related to personnel, and wildlife contact. The least frequently reported categories of biosecurity measures were the presence of a perimeter fence, vehicles and parking, contact with animals from other farms, and isolation of sick animals. RESULTS: from this scoping review show an extensive variation between articles, including differences in the number of participants, biosecurity practices examined, practices considered "biosecurity" per authors' definition, measurement scale for reporting biosecurity practices, and definitions of "small," "backyard," and "hobby" used by the authors. These findings highlight the need to develop standardized definitions and adaptable biosecurity checklists for practices implemented in small and backyard farms, which would allow for better comparisons across regions and countries for future research.

Effectiveness of Cold Smoking on Inactivating Murine Norovirus in Salami-Like Pork Sausages (Mettwurst), and Hepatitis E Virus and Murine Norovirus in Solution

Hepatitis E virus (HEV) is a zoonotic virus that infects humans when virus-containing pork products are consumed. This study aimed to explore MNV (murine norovirus) and HEV inactivation during cold smoking and ripening/fermentation treatments used for salami-like sausages (mettwurst). MNV inactivation was monitored in culture medium solution and in sausage while being subjected to a salami-like sausage manufacturing process. The inactivation of MNV in the solution was also monitored at room temperature (RT) for four weeks. HEV inactivation was monitored in solution during the cold smoking process and at RT. A TCID50 assay was used to calculate the infectious MNV and HEV titres. MNV survival was modelled using Bayesian inference. MNV load in solution decreased by as much as 4.7 (SD 0.9) log10 TCID50/ml when it was subjected to the cold smoking process. Modelling revealed that 99.999% MNV might be inactivated during the treatment when observed at a level of 95% CI (Bayesian Confidence Interval). On the contrary, MNV load decreased by only 1.8 (0.2) log10 when stored at RT. The low-titre HEV in solution was inactivated (> 1.1 (0.2) log10) when treated, and at RT. However, MNV was resistant in the sausage matrix during the cold smoking process (log10 reduction of 1.9 (0.5) TCID50/ml). Based on modelling, a substantial amount of virus would remain in the product, even when the uncertainty was considered. Hence, viruses, here exemplified by MNV, may not be inactivated from salami-like pork sausages during manufacturing, which poses a risk for consumers in real-life situations.

Control of Neonatal Diarrhea in Piglets with Reduced Antibiotic Use by Application of a Complementary Feed-A Randomized Controlled Farm Trial

The objective of this farm trial was to investigate if the consumption of antibiotics could be reduced when piglets showing early signs of neonatal diarrhea were treated with an oral dose of tannin extract derived from sweet chestnut wood. The farm had a very high incidence of neonatal diarrhea among gilt litters. Gilts were randomized into test or control groups in a 1:1 ratio to compare the consumption of antibiotics used for piglets and piglet mortality during the four-week trial period. Control litters were treated with the oral antibiotic paromomycin, while test litters were treated with the complementary feed O-Nella-Protect. The farm trial included 18 gilt litters comprising 254 piglets. In the control group, 100% of the piglets received antibiotic treatment. In the test group, consumption of antibiotics used against diarrhea was reduced by 84% (p = 0.001) and consumption of antibiotics used for other illnesses was reduced by 45% (p = 0.045). In both test and control groups, six piglets died. Microbiological analysis identified both potential bacterial and viral pathogens. In conclusion, the farm trial indicates that even under the challenge of potentially serious bacterial and viral pathogens, a complimentary feed containing a tannin extract can support piglet health and reduce antibiotic consumption.

Umbilical outpouchings in pigs - an international survey on fitness for transport, welfare and management

BACKGROUND

Umbilical outpouchings (UOs) in pigs are a multifactorial disease and little is known about effective prevention strategies and risk factors for UO development. UOs are common in Danish pigs and legislation complicates and increases the cost of keeping and raising pigs with UO. Recommendations for preventive measures exist but the scientific evidence behind the recommendations is often lacking. This study´s purpose was to investigate veterinarians' perspectives on UO pigs´ fitness for transport, the welfare of UO pigs, the significance of UO, risk factors for the development of UO, and the management of pigs with UO. This study´s purpose was to investigate veterinarians' perspectives on UO pigs´ fitness for transport, the welfare of UO pigs, the significance of UO, risk factors for the development of UO, and the management of pigs with UO.

RESULTS

The survey received 93 complete responses from veterinarians working within porcine health management. Because of the large proportion of replies from Danish veterinarians, all reporting of results was divided among Danish and non-Danish veterinarians. There were no statistically significant differences between the two groups in the assessment of fitness for transport. Both groups mainly agreed to a series of statements regarding the significance of UO and risk factors for UO development. The management of UO was also similar across the groups except for the use of neonatal antibiotics which was used considerably more in Danish herds.

CONCLUSIONS

Umbilical outpouchings seem to be perceived as a challenge across pork production; affecting the welfare of the individual pig as well as the management of the entire production. There were no significant differences between Danish and non-Danish veterinarians' assessments of fitness for transport, and almost all the veterinarians agreed that some UO pigs might need special attention and care. Most would also recommend preventive measures. Despite most respondents in this survey working under the laws of the European Union, some were unaware of legislation regarding UO pigs.

A proposal of a fecal scoring system based on physicochemical analyses of suckling pig feces

BACKGROUND

Digestive disorders are one of the main health problems in suckling piglets. The correct visual identification of feces in suckling piglets is an important tool for the diagnosis of enteric diseases. The aim of the present observational study was to analyze different physicochemical parameters of the feces of suckling piglets aged 0 to 21 days: visual appearance (color and consistency), fecal dry matter (FDM) content and pH. A total of 482 fecal samples were collected and visually classified into six categories: meconium, colostrum stage feces and 4 further scores according to the degree of consistency: 0 = form; 1 = pasty; 2 = liquid; and 3 = watery feces. The percentage of FDM was estimated by two drying methods, oven and microwave, doing duplicates in each one to evaluate methods, and both were compared.

RESULTS

The most frequent colors of each feces category were dark green or dark brown for meconium; orange for colostrum; formed feces were mostly ocher and for the rest of the feces, the colors varied predominantly cream and ocher. Regarding FDM, liquid and watery categories had no statistically significant differences between them; meconium and colostrum feces FDM were not statistically different from pasty feces. The correlation coefficient between the FDM values of the duplicate analyses of the samples by both methods (oven and microwave) was very high (> 0.988). Importantly, no differences were found while comparing the results between both methods (p = 0.078), and the correlation coefficient between all samples analyzed with both methods was very high (> 0.98). Meconium was the only one that differed significantly from the rest in terms of pH.

CONCLUSION

The physicochemical study of the feces of suckling piglets including color, FDM and pH allowed the establishment of an objective fecal score to characterize the stools in this age group.

CD40 Ligand Potentiates Immunogenecity of Mycoplasma pneumoniae Subunit Vaccine Candidate in a Murine Model

Mycoplasma hyopneumoniae (Mhp) infection severely affects the daily weight gain and feed-to-meat ratio of pigs, while secondary infections with other pathogens can further lead to increased mortality, causing significant economic losses to the pig industry. CD40L is a molecular adjuvant that enhances the cellular and humoral immune responses to vaccines. In this study, the CD40L peptide was fused to the C-terminus of the chimeric P97R1P46P42 protein by genetic engineering using the pFastBac Dual vector. The recombinant chimeric protein P97R1P46P42 and its fusion P97R1P46P42-CD40L were expressed in Sf9 cells and purified. Mice were immunized with P97R1P46P42 or its fusion protein. Seppic ISA 201 emulsified protein, conventional Mhp vaccine and PBS control groups were included. Immunogenecity was assessed by specific IgG antibody response, splenic lymphocyte proliferation, and cytokine IL-4 and IFN-γ levels. We found that CD40L fusion significantly enhanced specific antibody response, lymphocyte proliferation and IL-4 level in the immunized mouse sera as compared to the P97R1P46P42 or conventional vaccine group. This study provides clear evidence that CD40L potentiates the humoral and cellular immune responses to the Mhp chimeric protein P97R1P46P42 in the mouse model. This CD40L-fused chimeric protein could be a MPS subunit vaccine candidate to be tested for its efficacy in pigs in response to challenges with pathogenic Mycoplasma hyopneumoniae strain(s).

Seroepidemiological Survey of Hepatitis E Virus in Intensive Pig Farming in Vojvodina Province, Serbia

Hepatitis E virus (HEV) is the causative agent of acute hepatitis E infection in humans. Two epidemiological patterns of the disease exist-endemic and sporadic. Genotypes 1 (HEV-1) and 2 (HEV-2) are transmitted through contaminated water and are responsible for the outbreaks of many large-scale epidemics in developing countries of Asia and Africa. Genotypes 3 (HEV-3) and 4 (HEV-4) have zoonotic potential and cause sporadic cases and small outbreaks in high-income countries. The first case of HEV infection in swine was confirmed in 1997 and later detected in other animal species. The aim of this study was to investigate the seroprevalence of HEV infection in pig farms in Vojvodina province, Serbia. Three hundred blood samples were collected from five different categories of pigs from 3 different farms on the territory of the South Bačka district in Vojvodina (Serbia). The analyses were conducted by in-house ELISA, while the western blot method was used as a confirmatory test for doubtful results. The presence of HEV IgG was detected on all three examined farms. The established seroprevalence in Farm A was 37%, 31% in Farm B, and 54% in Farm C. The mean seroprevalence for all farms was 40.66%. A higher seroprevalence was found in fatteners compared to younger categories of pigs. We concluded that HEV is widespread on pig farms with intensive management. Further analyses should be conducted with the aim of implementing a surveillance program to prevent possible human infection.

Therapeutic potential of short-chain fatty acids for acute lung injury: a systematic review and meta-analysis of preclinical animal studies

Background

Short-chain fatty acids (SCFAs), derived from the fermentation of dietary fiber by intestinal commensal bacteria, have demonstrated protective effects against acute lung injury (ALI) in animal models. However, the findings have shown variability across different studies. It is necessary to conduct a comprehensive evaluation of the efficacy of these treatments and their consistency.

Objective

This systematic review and meta-analysis aimed to explore the effects of SCFAs on ALI based on preclinical research evidence, in order to provide new treatment strategies for ALI.

Methods

We included studies that tested the effects of SCFAs on ALI in animal models. This study was performed according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. A comprehensive search for relevant studies was conducted in the PubMed, Embase, Web of Science, Cochrane Library, and China National Knowledge Infrastructure (CNKI) databases up to February 2024. The data were extracted in accordance with the established selection criteria, and the risk of bias was evaluated for each study.

Results

A total of 16 articles were finally included in the meta-analysis. The results indicated that the SCFAs significantly reduced lung wet-to-dry weight (SMD = -2.75, 95% CI = -3.46 to -2.03, p < 0.00001), lung injury scores (SMD = -5.07, 95% CI = -6.25 to -3.89, p < 0.00001), myeloperoxidase (SMD = -3.37, 95% CI = -4.05 to -2.70, p < 0.00001), tumor necrosis factor-alpha (SMD = -3.31, 95% CI = -4.45 to -2.16, p < 0.00001) and malondialdehyde (SMD = -3.91, 95% CI = -5.37 to -2.44, p < 0.00001) levels in animal models of ALI. The results of the subgroup analysis indicated that the efficacy of SCFAs varies significantly with dosage and duration of treatment.

Conclusion

SCFAs can reduce inflammation and oxidative stress in animal models of ALI. The clinical efficacy of SCFAs for ALI deserves further in-depth research.

Systematic review registration

https://www.crd.york.ac.uk/PROSPERO/display_record.php?RecordID=584008, CRD42024584008.

Biosecurity Practices for Reducing Antimicrobial Use in Commercial Broiler Farms in Korea

Farm biosecurity is valuable for reducing the indiscriminate use of antimicrobials. However, its relationship with antimicrobial usage can be difficult to assess because of multiple factors. This study evaluated the impact of biosecurity practices on productivity, frequency of antimicrobial use, and development of antimicrobial resistance. Among factors related to biosecurity, mortality rate <2% within one week of age, survival rate >98%, and production index >350 in farms in which: bedding was not reused or only reused once, regular advice and biosecurity training was provided by poultry veterinarians, distinctions between clean and dirty areas were strictly enforced at all times, workers used farm biosecurity manuals, or disinfection guidelines were fully implemented, including cleaning before introducing new flocks and daily disinfection throughout growth, were significantly higher than those in farms without these measures (p < 0.05). The absence of biosecurity practices increased antimicrobial use to one (25.7%), two (39.2%), and three (25.7%) times (p < 0.05). In farms that implemented biosecurity practices, the antimicrobial administration was significantly increased to two times (44.2%) (p < 0.05), with only 17.4% of farms using antimicrobials three times. The prevalence of environmental Escherichia coli resistant to multiple cephalosporins and chloramphenicol, which are not used on broiler farms, was significantly reduced by biosecurity practices (p < 0.05). Our findings indicate that improved biosecurity practices decrease antimicrobial use, decrease the incidence of antimicrobial-resistant bacteria, and help to eliminate resistant bacteria in farm environments.

The sow vaginal and gut microbiota associated with longevity and reproductive performance

BACKGROUND

Sow longevity and reproductivity are essential in the modern swine industry. Although many studies have focused on the genetic and genomic factors for selection, little is known about the associations between the microbiome and sows with longevity in reproduction.

RESULTS

In this study, we collected and sequenced rectal and vaginal swabs from 48 sows, nine of which completed up to four parities (U4P group), exhibiting reproductive longevity. We first identified predictors of sow longevity in the rectum (e.g., Akkermansia) and vagina (e.g., Lactobacillus) of the U4P group using RandomForest in the early breeding stage of the first parity. Interestingly, these bacteria in the U4P group showed decreased predicted KEGG gene abundance involved in the biosynthesis of amino acids. Then, we tracked the longitudinal changes of the microbiome over four parities in the U4P sows. LEfSe analysis revealed parity-associated bacteria that existed in both the rectum and vagina (e.g., Streptococcus in Parity 1, Lactobacillus in Parity 2, Veillonella in Parity 4). We also identified patterns of bacterial change between the early breeding stage (d 0) and d 110, such as Streptococcus, which was decreased in all four parties. Furthermore, sows in the U4P group with longevity potential also showed better reproductive performance. Finally, we discovered bacterial predictors (e.g., Prevotellaceae NK3B31 group) for the total number of piglets born throughout the four parities in both the rectum and vagina.

CONCLUSIONS

This study highlights how the rectal and vaginal microbiome in sows with longevity in reproduction changes within four parities. The identification of parity-associated, pregnancy-related, and reproductive performance-correlated bacteria provides the foundation for targeted microbiome modulation to improve animal production.

Field study on the suitability of oral fluid samples for monitoring of Lawsonia intracellularis and Brachyspira hyodysenteriae by multiplex qPCR under field conditions

BACKGROUND

Monitoring or surveillance of infectious diseases is crucial in terms of herd health management of livestock. Investigations of oral fluids have become an animal friendly routine strategy to monitor respiratory pathogens in pigs. Less is known about the suitability of oral fluids for the detection of enteric pathogens in swine. In the present study we evaluated the use of oral fluids to monitor B. hyodysenteriae and L. intracellularis compared to pooled fecal samples by multiplex qPCR in a pen-wise follow-up of fattening pigs. Therefore, we collected oral fluids at an age of 12, 16 and 20 weeks of life and compared them to pooled fecal samples collected from the same pens on two fattening farms.

RESULTS

Cohen´s Kappa analysis revealed a substantial agreement between oral fluids and pooled fecal samples on pen level (Cohen´s Kappa: 0.745; p < 0.001). DNA-loads of L. intracellularis were tendentially higher (p = 0.053) in pooled fecal samples than in the corresponding OFs.

CONCLUSIONS

The present study shows that oral fluids are an appropriate tool to monitor B. hyodysenteriae and L. intracellularis on conventional fattening farms under field conditions. However, multiple pen testing should be conducted to increase the diagnostic performance and sensitivity.

p54-Fc-Labeled Gold Nanoparticle-Based Lateral Flow Strip-Assisted Portable Devices for Rapid and Quantitative Point-of-Care Detection of ASFV Antibodies

In this study, a novel rapid immunochromatographic (IC) test for African swine fever virus (ASFV) antibodies is presented. An immunochromatographic test (IC) is a detection technique that combines membrane chromatography with immunolabeling. This approach saves time for antibody preparation, resulting in a shorter production cycle. p54 is an important structural protein of African swine fever, and an ideal protein for serotype diagnosis. Gold nanoparticles are attached to the ASFV p54-Fc fusion protein, and the ASFV-specific antigen p54 and Staphylococcus aureus protein A (SPA) are labeled on a nitrocellulose membrane, at positions T and C, respectively. We developed a SPA double sandwich IC test strip, and assessed its feasibility using ASFV p54 and p54-Fc fusion proteins as antigens. ASFV p54 and p54-Fc fusion proteins were expressed and purified. A sandwich cross-flow detection method for p54, which is the primary structural protein of ASFV, was established, using colloidal gold conjugation. Our method can detect ASFV antibodies in field serum samples in about 15 min using a portable colloidal gold detector, demonstrating high specificity and sensitivity (1:320), and the coincidence rate was 98% using a commercial ELISA kit. The dilution of the serum sample can be determined by substituting the absorbance (T-line) interpreted by portable devices into the calibration curve function formula of an African swine fever virus standard serum. In summary, our method is rapid, cost-effective, precise, and highly selective. Additionally, it introduces a new approach for constructing IC test strips using SPA protein without antibody preparation, making it a reliable on-site antibody test for ASFV.

Perceptions of swine euthanasia among Brazilian caretakers from non-integrated swine farms

Timely and humane euthanasia is crucial for animal welfare on swine farms, yet challenges persist in its implementation, particularly in Brazil, where the responsibility often falls to caretakers lacking training. This study aimed to assess the knowledge, attitudes, and practices of swine caretakers regarding euthanasia across non-integrated farms (ranging from 1,000 to 3,500 housed sows) and different experience levels (from less than a month to 40 years working with pigs). A total of 117 people directly working with pigs participated in a survey designed to evaluate their decision-making skills, euthanasia competencies, and understanding of Brazilian guidelines for euthanasia methods. Using Cluster analysis, we identified two distinct groups of caretakers: (1) Empathetic, self-sufficient, apathetic about euthanasia; and (2) Empathetic, knowledge seeker, uncomfortable with euthanasia. Both Clusters exhibited high empathy toward pigs and confidence in identifying sick animals but differed in their attitudes toward euthanasia. The risk factor analysis showed a tendency for younger respondents (under 36 years old) and those from smaller farms (less than 2,000 sows) were more likely to belong to Cluster 2, while older caretakers (over 36 years) and those working on larger farms (more than 2,000 housed sows) tended to belong to Cluster 1. Furthermore, a significant proportion of caretakers lacked knowledge of the euthanasia Brazilian guidelines, as evidenced by incorrect responses regarding acceptable euthanasia methods, such as performing cardiac perforation or using non-penetrating captive bolt guns on growing-finishing pigs. This study highlights the variability in caretaker experience and attitudes toward euthanasia, suggesting a critical need for targeted training programs and euthanasia protocols that address both emotional and practical aspects. Improved understanding of caretaker attitudes can enhance both human and animal welfare on farms.

A comparison of two systems for group housing of gestating sows - effects on productivity, removal, and treatments

BACKGROUND

Group housing of sows has been extensively studied since the EU banned gestation crating. Well-managed group-housing promotes sow welfare, but the impact varies based on factors such as feeding, group characteristics, and environmental features. Adequate floor space, particularly directly post-mixing, is crucial for social interactions, natural behaviours, and to reduce injuries caused by aggression. The aim of this study was to compare two group-housing systems for gestating sows with respect to productivity, treatment frequency, and removal of sows. Both systems were static but differed in space allowance, quantity of enrichment material and feeding management. System I comprised of large sized pens with deep litter straw bedding, housing in total 40 sows, and System II of smaller sized pens with permanent access to straw, housing 8 to 10 sows.

RESULTS

The mean parity number was 3.1 ± 1.3 in both groups. Sows housed in System I with large groups (n = 40) in large pens with deep litter straw gave birth to 16.8 ± 0.33 (Least Squares Means, LSM) piglets, compared to 15.4 ± 0.31 (LSM) for sows in System II kept in smaller groups (n = 8-10) in smaller pens (p = 0.0005). Medical treatments of sows were more frequent (p < 0.001) in System II. The incidence of replacement of sows was comparable in both systems, and there was a high occurrence of sows becoming pregnant during the subsequent insemination in both groups.

CONCLUSIONS

This study indicated that sows kept in larger groups provided with a larger floor space (a total area of 156 m2, corresponding to 3.9 m2 per sow) and housed on deep straw had a higher number of liveborn and weaned piglets and lower incidence of antibiotic treatments than sows with less floor space (a total area of 24.5 m2, corresponding to 2.5-3.1 m2 per sow) and less bedding/manipulable material.

Effect of intramuscular treatment with different iron dextran dosages and non-inferiority study to gleptoferron

BACKGROUND

Prevention of iron deficiency in suckling piglets by intramuscular injection of a standardized amount of iron dextran or gleptoferron in the first days of life can lead to over- or underdosage with respective health risks. Currently, combined iron products containing an active substance against coccidia are also used on farms. When using a combination product targeting two diseases, an adjustment of the necessary amount of iron to prevent anaemia in the frame of a farm-specific treatment protocol is not possible. The aim of this study was to test if iron dextran, which can be used in flexible volumes, is statistically non-inferior to a combinatory product, containing gleptoferron and toltrazuril. In addition, different administration schemes for iron dextran with respect to time point and dosage were compared on a conventional farm. Within each out of 17 litters eight healthy piglets were allocated to one of the four treatment groups on the second day of life: (1) 200 mg iron dextran, (2) 200 mg gleptoferron and 45 mg toltrazuril in combination, (3) 300 mg iron dextran, (4) 200 mg iron dextran and additional intramuscular administration of 200 mg iron dextran on day 11 of life. Pigs of groups 1, 3 and 4 received toltrazuril orally. Red blood cell measures were determined prior to treatment on day 2 of life and at weaning. Body weights were measured on day 2, 24, 74 and 160 of life.

RESULTS

Iron dextran was non-inferior compared to gleptoferron within a tolerance range of ± 5 g haemoglobin/L. In total, treatment groups did not differ with respect to red blood cell parameters and average daily weight gain. The 50% pigs with intermediate birth weights profited from an additional iron dextran administration with respect to higher haemoglobin concentrations at weaning.

CONCLUSIONS

In this investigation gleptoferron and iron dextran appear equally appropriate for prevention of iron deficiency anaemia. Piglets of different birth weights might profit differently from an additional iron administration, so that usage of a product containing iron as a single substance is of advantage to allow a flexible adjustment of dosage during the suckling period.

Effect of pre-farrowing hygiene routine (sub-standard vs. optimal) and creep feeding regime (dry pelleted starter diet vs. liquid mixture of milk replacer and starter diet) on post-weaning intestinal parameters and growth to slaughter in pigs

The objective was to evaluate the effect of providing a dry pelleted starter diet (DPS) or a liquid mixture of milk replacer and starter diet (LMR + S) to suckling pigs housed in farrowing pens of sub-standard or optimal hygiene conditions on pig growth to slaughter, and post-weaning (PW) intestinal parameters. On day (d) 107 of gestation, 87 sows were randomly allocated to one of four treatments in a 2 × 2 factorial arrangement. The factors were creep feeding (DPS or LMR + S) and pre-farrowing hygiene routine (SUB-STANDARD or OPTIMAL). Pigs were provided with DPS (manually) from d 11 to weaning (at d 28 ± 1.2 of age) or LMR + S using an automatic liquid feeding system from d 4 to weaning. The SUB-STANDARD hygiene routine (pens washed and dried for ~18 h, sows not washed or disinfected) and the OPTIMAL hygiene routine (pens pre-soaked, detergent applied, washed, dried for 3 days, chlorocresol-based disinfectant applied, dried for 3 more days, and sows washed and disinfected with Virkon) were used to obtain SUB-STANDARD or OPTIMAL hygiene conditions, respectively, in farrowing rooms prior to entry of sows. Microbiome analysis was performed on fecal samples from eight focal pigs per treatment, before weaning and at d 21 and d 114 PW. On d 4 PW, 10 pigs per treatment were euthanized to collect intestinal tissue and digesta samples for histological, enzyme activity, and microbiome analysis. Feeding LMR + S to pigs born into the OPTIMAL hygiene increased total dry matter intake compared to all of the other groups (P ≤ 0.05) and increased weaning weight compared to DPS feeding under both OPTIMAL and SUB-STANDARD hygiene conditions (P ≤ 0.05). Pigs from OPTIMAL farrowing pens had lower clinical cases of disease, diarrhea prevalence, and were slaughtered 3.8 days earlier than those from SUB-STANDARD farrowing pens (P ≤ 0.05). Suckling piglet mortality was reduced with LMR + S (P ≤ 0.05). On d 4 PW, jejunal and ileal villus height were increased by OPTIMAL hygiene and ileal sucrase activity was increased by LMR + S (P ≤ 0.05). On d 4 PW, LMR + S-fed pigs from OPTIMAL farrowing pens had a lower relative abundance of Clostridium_P in the jejunum. In conclusion, the OPTIMAL hygiene routine increased pre-weaning LMR + S feed intake, reduced clinical cases of disease, improved intestinal structure, and reduced the weaning to slaughter duration, while LMR + S feeding increased weaning weight, intestinal maturity, and reduced pre-weaning mortality.

Methicillin-Resistant Staphylococcus aureus: The Shifting Landscape in the United Arab Emirates

BACKGROUND

Methicillin-resistant Staphylococcus aureus (MRSA) is a significant burden globally, particularly in the Arabian Gulf region. The United Arab Emirates (UAE) has experienced rising MRSA prevalence, with increasing diversity in the clonal complexes (CCs) identified. The COVID-19 pandemic, with its increased hospitalization rates and antibiotic use, may have further influenced MRSA's genetic evolution and epidemiology in the country.

METHODS

To investigate this influence, genomic profiling of 310 MRSA clinical isolates collected between February and November 2022 was performed using a DNA microarray-based assay.

RESULTS

Isolates were assigned to 22 clonal complexes and 72 distinct strain assignments. The predominant clonal complexes were CC5, CC6, CC361, CC22, CC1, and CC8. Community-acquired MRSA lineages were dominant, with only one healthcare-associated MRSA lineage isolate identified. Upward trends of CC1153 were observed along with rare CCs, such as CC121-MRSA and CC7-MRSA, with the latter being reported for the first time in the Arabian Gulf region. The presence of pandemic strains USA300 CC8-MRSA-[IVa + ACME1] and CC8-MRSA-IV strains were also observed, including variants lacking Panton-Valentine leukocidin (pvl) genes and missing tst1 or enterotoxin genes. The PVL-negative CC772-MRSA-V/VT was identified, representing its first report in the UAE. A novel variant, CC361-MRSA-IV (tst1+/PVL+), was identified. Pvl genes were observed in 36% of the isolates, primarily from skin and soft tissue infections, while fusC (SCC-borne fusidic acid resistance) was identified in 13% of the isolates.

CONCLUSIONS

The findings highlight the ongoing evolution of MRSA in the UAE, with the persistence and emergence of diverse and rare clonal complexes, driving the need for continuous genomic surveillance.

Testicular tumors in commercial boars with infertility: A gross, histologic, and immunohistochemical study

Tumors in boars are uncommon, and testicular tumors even rarer. This study describes the pathological and immunohistochemical characteristics of a case series of testicular tumors in commercial boars with fertility problems. Tumors were detected in 19 of 333 animals (19/333, 5.9%). Macroscopically, tumors were observed in 13 (13/19, 68%) boars, while 6 cases (6/19, 32%) were only detected by microscopic examination. Testicular enlargement was observed in 1 boar, while in the others, tumors were only observed after removal of the scrotal skin or after sectioning of the testis. Histologically, tumors were classified as seminomas (16/19, 84%), mixed germ cell-stromal tumors (2/19, 11%), and B-cell lymphoma (1/19, 5%). Seminomas had 3 different growth patterns: intratubular (6/16, 38%), diffuse (4/16, 25%), and intratubular/diffuse (6/16, 38%). All tumors that were not evident on macroscopic examination were intratubular seminomas. Intratesticular metastases were observed in 2 cases and extratesticular metastases, located in the pampiniform plexus, were observed in 1 case. In 1 seminoma, the rete testis was also involved. By immunohistochemistry, all intratubular seminomas were negative for c-kit, cytokeratin, and vimentin. In diffuse seminomas, c-kit and cytokeratin were also negative, while vimentin showed granular or perinuclear cytoplasmic labeling in some areas. PAX-5 and CD-3 antibodies classified the lymphoma as a B-cell lymphoma. This study suggests that testicular tumors in boars may be more common than previously reported, especially when microscopic examination is performed. It also shows that testicular tumors in pigs are predominantly seminomas.

Efficacy of GPE- strain live attenuated vaccine and CP7_E2alf strain recombinant live vaccine (marker vaccine) against Japanese epidemic classical swine fever virus isolated in 2019 and DIVA discrimination ability of the marker vaccine

Classical swine fever (CSF) re-emerged in Japan in 2018, with the epidemic virus identified as genotype 2.1, which is moderately virulent and more difficult to detect and control than the highly virulent strain. Domestic pigs were administered with GPE- strain live attenuated vaccine (GPE- vaccine) for outbreak management. CP7_E2alf strain recombinant live vaccine (marker vaccine), approved for differentiation of infected from vaccinated animals (DIVA), was considered optional for obtaining CSF-free country certification issued by the World Organization for Animal Health. This study aimed to assess the efficacy of both vaccines in pigs through experimental challenge tests and evaluate the DIVA ability of the marker vaccine using two enzyme-linked immunosorbent assay (ELISA) antibody detection kits. Results showed that both GPE- and marker vaccines were effective against the Japanese epidemic strain; however, the ability of the ELISA antibody detection kits to discriminate the marker vaccine was limited. Therefore, to achieve CSF-free certification using vaccines with DIVA functionality, alternative detection methods and enhancement of the sensitivity and specificity of ELISA kits are needed.

A dynamic framework for calculating the biomass of fattening pigs with an application in estimating the burden of porcine reproductive and respiratory syndrome in the Netherlands

Gaining insight into the size and composition of national pig populations can support decisions on disease control, welfare, and environmental sustainability. However, if one needs to draw meaningful comparisons between the performance of various production systems or countries, a method for standardization is required. One approach to achieve this is by means of biomass estimation. The objective of this study was to develop a biomass estimation framework that can provide detailed and reliable estimates of fattening pig biomass disaggregated by pig life stage (suckling, weaning and fattening), while accounting for the dynamic nature of pig populations. The framework was developed on publicly accessible data pertaining to pig production in the Netherlands, and we additionally assessed availability of required data for several other European countries (Spain, Germany, and Great Britain). Three distinct life stages-suckling piglets, weaning pigs, and fattening pigs-are considered in the framework. Demographic and movement data, including yearly imports, exports, and slaughter numbers, along with standing populations, were collected from official governmental sources. Required production parameters were sourced from representative surveys, with missing parameters supplemented by private industry reports or expert elicitation. The results from the framework for the Netherlands yield insights into the Dutch pig sector. In 2020, 156 million kg, 552 million kg, and 1654 million kg of biomass were produced in the suckling, weaning, and fattening stages, respectively. The evaluation against census data indicated the framework's reliability, with deviations mostly below 10 %. Data availability assessments for Spain, Germany and Great Britain reveal variations in data completeness and underscore the importance of local contacts and language expertise when extending the framework to other countries. The framework's relevance was further demonstrated through an illustrative application, assessing the impact of porcine reproductive and respiratory syndrome on pig biomass in the Netherlands. In the most severe disease scenario, the produced biomass decreased by 13 %, 17 %, and 66 % in the suckling, weaning, and fattening stages, respectively. Beyond disease burden estimation, the biomass estimates can be used as a denominator for various purposes to provide efficiency metrics, such as the amount of antibiotics used or the volume of greenhouse gases emitted per kilogram of pig biomass produced. While the framework could benefit from further refinement regarding resource use and economic values, its current iteration provides a robust and unique foundation for estimating biomass disaggregated by pig life stage, aiding decision-makers in the agricultural and veterinary sector.

Seroprevalence of Toxoplasma gondii in domestic dogs from Lima City in Peru

The protozoan Toxoplasma gondii, which can infect a wide range of warm-blooded animal hosts, including humans, causes the zoonosis toxoplasmosis. This parasite affects dogs, and infections may lead to neuromuscular problems in them. Likewise, dogs can act as sentinels for toxoplasmosis, providing valuable information on the prevalence of the parasite in a given area. Therefore, the aim of the present study was to determine the seroprevalence of T. gondii in dogs from Lima City in Peru. A total of 120 sera from domestic dogs were used to detect IgG antibodies using the modified agglutination test (MAT). Forty dogs tested positive for the MAT, indicating a seroprevalence of 33.3 % (CI95% 24.9-41.8 %). Only the variable sex demonstrated a statistical association with exposure to T. gondii in dogs, with males exhibiting odds of 2.40 (CI95% 1.10-5.37) compared to females. Since dogs are the main human pet, they could act as sentinels to estimate the situation of toxoplasmosis in humans. Our findings highlight the need to continue epidemiological surveillance of T. gondii in canine populations in various localities of Peru.

Transport-related influences on the quality of liquid-preserved boar sperm: A review

This review explores the impact of transport-related stresses on the quality of liquid-preserved artificial insemination (AI) doses in pig reproduction. Transport of boar semen from AI centers to sow farms, the place of application, is an essential part of the production chain with increasing international demand, especially against the background of growing export demand. Understanding how factors such as: a) transport-related vibration emissions; b) temperature fluctuations during transport; c) transport duration; d) duration of storage after transport; and e) the method used for preserving AI doses, affect their quality is, therefore, essential for optimizing fertility outcomes. We provide a review of existing literature on the biological responses of liquid-preserved boar sperm to transport conditions. In addition, we discuss their impact on sperm quality and summarize potential mitigation strategies.