NHF: Unknowns remain about water quality impact on pig performance

Our monthly collaboration with the National Hog Farmer continues; this month Drs. Johnston, Shurston, Lozinski, and  Urriola from the College of Extension and the College of Food, Agricultural and Natural resources Sciences explain why there is much left to research on water quality.

Non-thriving pigs in the nursery are a concern among swine producers. Pigs are eating less, they get sick and do not perform well overall.

“Could bad water on the farm be a cause for reduced health and growth performance of these challenged nursery pigs?”

That depends on how bad the water is and how you define bad versus good water. Currently, there is no standard.

Aging literature references

In the scientific literature, the most widely quoted standards for quality of water fed to livestock comes from the U.S. National Research Council (1974) and the Canadian Council of Minister of the Environment (1987 and 2005).

Inconsistent findings in current research

McLeese et al. focused on the total dissolved solids (TDS) content in water. By increasing TDS 20-fold, they noticed that it had no impact on weaned pigs fed a medicated diet whereas it reduced significantly feed efficiency in non-medicated pigs. Several studies showed that pigs scours when drinking water with an increased concentration of sulfate, without necessarily affecting performances.

Another parameter to take into consideration is that some of the barns are getting older and so is the water distribution system. Water pipes and drinkers can impact water quality if they are not properly and regularly cleaned and maintained. However, despite the importance of water distribution systems in hog barns, scientifically-evaluated treatment and procedures are hard to find.

Conclusion

In 1992, McLeese et al. stated, “However, the current literature is neither conclusive nor thorough with respect to the impact of water quality on pig health, welfare and productivity.” It seems we are still in this position in 2018.

Science Page: Protecting the Inevitable Risk; Biosecurity Evaluation at a Truck Wash

We hope you all had a great Thanksgiving! An ever increasing amount of you is visiting this blog every month so thank you, we appreciate your support!

This is our Friday rubric: every week a new Science Page from the Bob Morrison’s Swine Health Monitoring Project. The previous editions of the science page are available on our website.

This week we are sharing a report by Megan Bloemer on biosecurity at a truck wash. Megan, a 3rd-year veterinary student from the University of Illinois, presented this project at the Leman Conference this year and won the Morrison Swine Innovator Prize.

Key points:

  • Monitoring cab cleaning and hot shot handle cleaning via Glo Germ Gel is simple and cost-effective.
  • Wiping down the cab interior with intervention wipes only adds around 5 minutes. These minor cost and time additions to truck wash procedures can help to prevent a million-dollar PRRS break.
  • Truck wash crew and trailer washers are often overlooked but perform a job that is essential in maintaining biosecurity and disease outbreak and therefore herd health.

The objective of this study was to assess overall biosecurity at the truck wash and identify potential areas of concern, measure and evaluate these areas of concern, and suggest solutions.

Potential Areas of Concern Identified

Cab Cleaning

Glo Germ Gel under a UV light when the door handle was not cleaned (left) and was wiped down (right).

The areas observed for cleaning included: steering wheel, dash, handles, climate control buttons, and radio. These areas were not being focused on; but are critical areas touched each time a driver is in the cab. In addition, it was difficult for monitors to tell if a cab had been cleaned or not by visual inspection alone.

Equipment Movement

After the three-day observation period, it became apparent that all equipment besides hot shots stayed in the dryers. Thus, hot shots were identified as the main equipment of concern. They were not returning with each trailer load, leading to biosecurity concerns.

Monitor Movement

Monitors inspect both PRRS positive and PRRS negative trailers throughout the day, before the wash crew is allowed to disinfect each trailer. Although monitors change boots and put on Tyvek before inspecting negative trailers, there is no true clean / dirty line where they change shoes.

Evaluation

Cab Cleaning

Steering wheel, dash, door handle, climate control buttons, and radio control buttons were evaluated on how well they were cleaned with a Glo Germ Gel product. The Glo Germ Gel was applied while the trucks were waiting in line to be cleaned. The assessment was performed using an UV light for any trace of the Glo Germ, indicating whether the surface had or had not been cleaned. The interior of cabs were not being cleaned as well as possible as evidenced by the amount of fluorescence that was detected in those five critical areas.

Equipment Movement

All of the hot shot handles and prods were numbered in both the PRRS positive and PRRS negative equipment sheds on a Sunday. Every night for the next five days it was checked if each hot shot was present, which equipment shed it was in, and new ones were numbered as they appeared. Throughout the course of those five days hot shot handles and prods were not being returned on a consistent basis. However, the equipment was not switched between the PRRS positive and PRRS negative sheds.

Monitor Movement

Glo Germ Gel and Powder was applied to the shoes of monitors and on positive trailers before monitors inspected them. Although no Glo Germ was appreciated in the PRRS negative areas, it may still be a potential area of concern and should be further evaluated.

Interventions

Cab Cleaning

In order to ensure that the interior of cabs were being cleaned as well as possible,the truck wash crew was shown images of the cab interiors with the Glo Germ Gel comparing interiors that were wiped down and those that were not. Current protocols could be clarified, and the importance of cab cleaning should be emphasized. Glo Germ Gel also gives the monitors the ability to do random internal audits of cab cleaning.

Equipment Movement

In order to check hot shot handle and prod cleanliness Glo Germ can be applied at the same time monitors put Glo Germ in the cabs. To encourage returning hot shots the truck wash crew can continue to write down cull and gilt trailers that do not return with a hotshot. To stop any potential cross-contamination, the PRRS-positive hot shots could be painted red.

Monitor Movement

Although no Glo Germ was appreciated it is possible that monitor movement is still a potential biosecurity risk and should be further evaluated. It appears that the Glo Germ washed right off as the trailers were wet when the monitors inspected them.

Keeping up with a changing world: new challenges, new technologies, new people

From hog cholera and pseudorabies to dendograms and microbiome

Things looked very different in the world of swine health and production when the Leman Swine Conference was inaugurated in 1974. It would be another four years until hog cholera would be officially eradicated from the USA, and 13 years until the appearance of PRRS. The US was a net importer of pork and pseudorabies was an emerging disease. Artificial insemination was virtually unheard of on commercial farms, and biosecurity, as we know it, was in its infancy.  The personal computer was about to make its debut in 1975, but it would be more than a decade (most notably with the development of PigCHAMP at the University of Minnesota), until computerized herd management software would evolve to become a mainstay of managing herds. Back then, access to data and information was at a premium, and for the 44 years since The Leman Swine Conference has provided a vibrant venue to exchange and discuss ideas and experiences, both practical and scientific. However, in contrast to 1974, our challenge is no longer how to access information, but how to digest and make sense of the deluge of information coming at us from endless sources.

While the transformation of swine production in the field has been stunning, it has been no less so in the scientific realm. Words such as PCR, sequencing, dendrogram, and microbiome, flow easily from the tongues of veterinarians today, but were not in the lexicon in 1974. We all know we are now in the era of “Big Data” where advancements in computer science and computational analysis have endowed us with tools to perform complex analyses at unprecedented speeds. The time-honored goal and purpose of the Leman Swine Conference, namely to foster the cross-fertilization of ideas between the science and practice of swine health and production, must find its footing in this new world of near real-time information acquisition, analysis and reporting. For those of us who were weaned on to traditional diets of veterinary medicine and animal sciences, this is not a trivial challenge, and more than ever there is a need for us to work across disciplines with people who have the relevant skill sets. We are fortunate that the state of Minnesota and its university have been proactive in recognizing and responding to these new opportunities.

New researchers to address these new challenges

In the 2015 legislative session, the Minnesota state legislature authorized a multi-year investment known as the Agricultural Research, Education, Extension and Technology Transfer Program (AGREETT).  The vision of the AGREETT program was to support positions for new faculty, technicians and graduate students to work in seven key areas to support agriculture in Minnesota:

  • Crop and livestock productivity
  • Microbial science
  • Advancing soil fertility and water quality
  • Agricultural technology and decision-making
  • Nutrient recycling and management
  • Agro-ecological innovation
  • Technologies aimed at managing pest resistance and climate change

Many of these new positions at the University have recently been filled, including six faculty hires at the College of Veterinary Medicine, three of whom were featured in the 2018 Leman Conference program.

Dr. Kim VanderWaal

Kim VanderWaal, PhD is a native Minnesotan with degrees from the University of Minnesota and University of California-Davis.Kim was recruited for the “Big Data” AGREETT position in the Department of Veterinary Population Medicine (VPM) where she was already working with the swine group on disease modeling projects and is involved in data analysis with the Morrison Swine Health Monitoring Project. Kim’s interests surround the use of large data sets to better understand pathogen movements within agricultural production systems, and other complex problems including aspects of food safety and antibiotic resistance. Kim lead the pre-conference workshop titled “Geeks to Geeks: A practitioner’s guide to designing research studies” involving several speakers addressing issues of study design and analysis, including case studies. As you are all aware, the growth of applied research conducted in industry makes this an important area for today’s veterinarians to build their skill base.

Dr. Noelle Noyes

Noelle Noyes, DVM, PhD, was recruited for the AGREETT position in antimicrobial resistance in the VPM department. She is a native of New York who did her undergraduate studies at Amherst, Massachusetts, then completed a joint DVM/PhD program at Colorado State University. Her doctoral research focused on antimicrobial use and resistance in feedlot cattle. Noelle brings state-of-the-art expertise in bioinformatics and shotgun sequencing of the microbiome, and is eager to apply her skills for the benefit of the swine industry in Minnesota.  At the Leman Conference, Noelle spoke in the break-out session titled “New Directions in Antibiotic Use and Resistance”. Her talk was titled “Antimicrobial use and Antimicrobial Resistance – How Will We Ever Understand It?” where she presented her perspectives on how new tools and approaches can help us address this important challenge.

Dr. Declan Schroeder

VPM also gained an AGREETT position in Pathogen Discovery and Surveillance, and successfully recruited Declan Schroeder, PhD to this position. Declan is an experienced molecular virologist who holds an honorary Chair in Viral Metagenomics in the School of Biological Sciences at the University of Reading, United Kingdom. He has over 20 years of research experience as a molecular biologist in the areas of virology, biodiversity, pathology, and genomics – in particular, the use of genomic tools to study key biological processes. His research focuses on a diverse array of host-virus systems, including the honeybee. He was the former Director of the Marine Biological Association of the UK Culture Collection where he was also a Senior Research Fellow in Viral and Molecular Ecology (2001-2018). Declan made a presentation titled ‘Molecular diagnostics: Present and future, in the Disease Diagnosis and Research break out session. His move to Minnesota means that the Schroeder lab will continue to develop molecular tools to enhance detection and surveillance to secure and improve agricultural productivity.        

Space does not permit detailed introduction of another dozen AGREETT hires in other Departments and Colleges across the University, but several of them have roles that will support the swine industry. These include Erin Cortus (agricultural engineer focused on manure and odor management, CFANS); Andres Gomez (microbiome, CFANS); Melissa Wilson (manure management and soil science, CFANS); Diane DeWitte (swine extension educator, CFANS); and Peter Larsen (host-pathogen interactions) and Mathew Aliota (vector-borne diseases) in the Department of Veterinary and Biomedical Sciences, CVM.

This group of talented researchers complements a well-established group of swine researchers,including our new Leman Chair Cesar Corzo, to strengthen our capacity to work with stakeholders to address the daily and emerging challenges of the swine industry.

Please keep a look out for Kim, Noelle, Declan, Erin and Andres, and help welcome them to our community. It is important to let them know or what you are seeing and doing in the field to help bring science and practice into alignment,and honor the tradition of Al Leman and Bob Morrison.

Cold plasma technology to clean swine barn air

Porcine reproductive and respiratory syndrome virus (PRRSv) costs the US swine industry more than $580 million each year. First described in North Carolina, Iowa, and Minnesota in the late 1980s, the virus rapidly spreads through swine barns and is one of the industry’s biggest game changers. Additionally, pigs infected with virulent strains exhales aerosols containing a large quantity of the virus.

Today, researchers in the Veterinary Diagnostic Lab at the CVM are looking to apply research they are doing on decontaminating foods in collaboration with the University of Minnesota College of Science and Engineering (CSE) to swine barn air filtration in an effort to further promote swine health and safety in the food industry at large.

Plasma, served cold

Plasma is defined as partially or fully ionized gases with neutral net charge. It consists of a cocktail of photons, ions, free radicals, molecules, and atoms—many of which are highly reactive, which allows for many applications, including water decontamination. Plasma sources can also be engineered to produce plasma at close to room temperature—often referred to as cold plasma—enabling the treatment of highly heat-sensitive surfaces, such as some foods.

2D- integrated coaxial micro hollow dielectric barrier plasma discharge array
Plasma (purple) is produced inside the holes of the array, through which air is blown. Pathogens are inactivated when they come into contact with the air coming through the holes in the array.

The United States Department of Agriculture is supporting Sagar Goyal, PhD, professor in the Department of Veterinary Population Medicine at the CVM; Peter Bruggeman, PhD, professor of Mechanical Engineering at the CSE; and their team of researchers in pursuing the use of cold atmospheric gaseous plasma technology for decontaminating food and food-processing surfaces.

The team is seeing success in the lab—bacteria and viruses stand little chance against the cold plasma they are making.

According to Goyal, the laboratory results look extremely promising. “If a surface is contaminated with viruses or bacteria, we can kill them,” says Goyal. “If food is contaminated—as early as during harvest by food handlers—our goal is to use cold plasma to kill the contaminants.”

A pig impact

“Meanwhile,” says Goyal, “swine farmers are already using air filtration systems to mitigate disease. But these are not foolproof, so if we can combine them with this cold plasma, it would be helpful in getting rid of any disease affecting swine that can be transferred by air.” This includes, but is not limited to, PRRSv. So, cold plasma could positively impact the food and agricultural industry in more ways than one.

Follow the link to read more about how cold plasma could be used in swine barns.

Science Page: Emerging enrofloxacin and ceftiofur resistance in E. coli isolated from US swine clinical samples

This is our Friday rubric: every week a new Science Page from the Bob Morrison’s Swine Health Monitoring Project. The previous editions of the science page are available on our website.

This week we are sharing a report from Dr. Shivdeep Singh Hayer from the STEMMA lab, on the emerging enrofloxacin and ceftiofur resistance in E.coli in swine.

Key points:

  • Nearly one-third of clinical E. coli isolates collected from swine samples were ceftiofur or enrofloxacin resistant
  • Genetic analysis revealed presence of rarely reported genes in antimicrobial resistant isolates
  • Most of the isolates were multi-drug resistant on both routine lab tests and genetic analysis

In a previous study, we analyzed the antimicrobial resistance in Escherichia coli isolates recovered from swine clinical samples from across USA during 2006-2016 at the University of Minnesota Veterinary Diagnostic Laboratory (UMN-VDL), and found a 47% annual increase in the prevalence of enrofloxacin resistance (from 1.5% in 2006 to 32% in 2016) while no trend was observed for the resistance to ceftiofur (that ranged between 32-39%). A follow-up study was conducted to evaluate the genetic basis of resistance against enrofloxacin and ceftiofur in E. coli isolates using whole genome sequencing (WGS).

153 swine clinical E. coli isolates collected in 2014-15 from 14 states across USA were selected and genes causing ceftiofur and enrofloxacin resistance were identified using WGS.

21 (out of 106) enrofloxacin-resistant isolates from 6 states harbored diverse plasmid mediated quinolone resistance (PMQR) genes (qnrB19, qnrB2, qnrS1, qnrS2 and qnrS15). The presence of PMQR genes alone was associated with clinical levels of resistance.

The most prevalent genes associated with ceftiofur resistance were blaCMY-2 (89/106, 84%). Moreover, 24 ceftiofur-resistant isolates harbored various blaCTX-M and blaSHV genes.

Additionally,  bacteria carrying blaCTX-M and qnr genes also contained genes coding for resistance mechanisms against other antimicrobial classes and were commonly resistant against ampicillin, tetracyclines, gentamycin, trimethoprim and sulfonamides.

These genes (blaCTX-M, qnr) have been rarely reported from farm animals in USA and have been implicated as important genetic mechanisms behind extended spectrum cephalosporin and fluoroquinolone resistance in human and animal populations in several countries. These genes are present on plasmids, making their dissemination across bacterial populations faster by horizontal transfer.

The presence of multiple antimicrobial resistance genes on the same plasmids also makes mitigation of this problem more difficult because of the possibility that using one antimicrobial class will exert positive selection pressure for resistance against other antimicrobial classes.

Global trends in infectious diseases of swine

Dr. Kim VanderWaal and Dr. John Deen from the University of Minnesota co-authored a new publication available now in the Proceedings of the National Academy of Sciences of the United States of America.

The objectives of this study were to identify priority swine pathogens, characterize temporal and geographic trends in research priorities.

57,471 publications covering 40 swine pathogens, compiled from 3 major database searches and dating from 1966 to 2016 were included in this analysis.

The top 10 pathogens published on were:

  • Salmonella spp.
  • Escherichia coli
  • Influenza
  • Pseudorabies
  • Foot and Mouth Disease
  • Porcine Reproductive and Respiratory Syndrome
  • Classical Swine Fever
  • Actinobacillus pleuropneumoniae
  • Trichinella spp.
  • African Swine Fever

The number of publications on swine infectious diseases increased over time as the hog production intensified. However, 8 pathogens increased faster than expected, particularly in the past 15 years: hepatitis E virus, Nipah virus, influenza, Streptococcus suisLawsonia intracellularis, porcine circovirus 2, PRRS, and PED.

On the contrary, some diseases had a slower growth in number of publications than expected. These included pseudorabies, Pasteurella multocida, Actinobacillus pleuropneumoniae, Brachyspira hyodysenteriae, and transmissible gastroenteritis virus. All of these pathogens were production diseases whose importance to the industry had declined in recent decades due to better control or even regional eradication.

Differences among world regions were identified except for influenza virus which appeared in the top 5 in most regions of the world. Southern regions where extensive hog production may still be the norm, tended to focus more on parasitic infections compared to Northern areas. Western Europe centered more on pathogens related to zoonotic and foodborne concerns compared to Northern America.

Read more about the evolution of publications on swine infectious diseases around the world.

Abstract

Pork accounts for more than one-third of meat produced worldwide and is an important component of global food security, agricultural economies, and trade. Infectious diseases are among the primary constraints to swine production, and the globalization of the swine industry has contributed to the emergence and spread of pathogens. Despite the importance of infectious diseases to animal health and the stability and productivity of the global swine industry, pathogens of swine have never been reviewed at a global scale. Here, we build a holistic global picture of research on swine pathogens to enhance preparedness and understand patterns of emergence and spread. By conducting a scoping review of more than 57,000 publications across 50 years, we identify priority pathogens globally and regionally, and characterize geographic and temporal trends in research priorities. Of the 40 identified pathogens, publication rates for eight pathogens increased faster than overall trends, suggesting that these pathogens may be emerging or constitute an increasing threat. We also compared regional patterns of pathogen prioritization in the context of policy differences, history of outbreaks, and differing swine health challenges faced in regions where swine production has become more industrialized. We documented a general increasing trend in importance of zoonotic pathogens and show that structural changes in the industry related to intensive swine production shift pathogen prioritization. Multinational collaboration networks were strongly shaped by region, colonial ties, and pig trade networks. This review represents the most comprehensive overview of research on swine infectious diseases to date.

Science Page: Illegal importation of meat derived food products through passenger airline carriers and possibility of disease introduction

This is our Friday rubric: every week a new Science Page from the Bob Morrison’s Swine Health Monitoring Project. The previous editions of the science page are available on our website.

This week we are sharing an article by the MSHMP team regarding the impact of illegal meat product importation on disease introduction.

Key Points:

  • Commercial airplane passengers bring illegal food imports
  • These illegally imported food products are an overlooked but important disease introduction source
  • The illegal importation by commercial travelers happens more frequently then generally assumed

Illegally imported products are a likely source of disease introduction

The recent African Swine Fever (ASF) outbreaks in China have created concern in the US swine industry over the possible introduction of the disease into the US, thus making Foreign Animal Disease (FAD) a primary topic of concern. One of the most pressing concerns about FADs in general, and ASF in particular, is what are the likely sources of entry, and how the associated risks can be mitigated. Illegally imported products, carried by commercial air passengers are often overlooked as a minor introduction source. Several studies around the world show that commercial air passengers do represent a likely source of disease introduction. Outbreaks of ASF, Classical Swine Fever (CSF) and Foot and Mouth Disease (FMD) have been attributed to feeding imported waste meat to domestic pigs (Falk, et al., 2013).

Thousands tons of illegal food products are found at airports

It is difficult to estimate the total amount of illegal food products entering a single country each year. A study conducted in Germany in 2015 at two major airports tracked seizures for three months, including an intensive 10 days of special controls where higher numbers of passenger luggage was searched. Based upon that data they estimated that each year 2,800 tons of illegal food products were brought in via the Frankfurt airport alone. The most commonly imported foods were meat and meat products, including raw, home cooked, preserved, and packaged foods (Beutlich, et al., 2015).

Another study, conducted in Switzerland estimated that the total volume of non-intercepted meat products were 8.6 tons for bush meat, and 1,013 tons for other meat products (Falk, et al., 2013).

Illegal food products contain pathogens; airports are risky ports of entry

A key point to understand the risk of improperly imported foods is knowing how often they contain pathogens and whether these have the capability of remaining infectious. In the German study, out of 474 samples tested, 5% of them contained food borne pathogens (Beutlich, et al., 2015). In a similar study conducted in Spain 67 out of 122 samples tested at an airport contained human noroviruses, and hepatitis E (Rodriguez-Lazaro, et al., 2015).

A modeling study focused on estimating the risk of introduction of ASF and CSF into the US using airport and customs data. The study identified specific airports (i.e.Washington-Dulles, George Bush-Houston, JFK-Queen, Warwick, Sanjuan, West Palm Beach, Charlotte, Ft. Lauderdale, Newark and Cleveland) as ports of entry with the highest risk for both ASF and CSF introduction. This work also identified the months of May through July as the months with the highest risk (Jurado, Paternoster, Martínez-López, Burton, & Mur, 2018).

Only a fraction of illegal imports are intercepted

It is estimated that only between 10-50% of improperly imported products are intercepted at customs (Jurado, Paternoster, Martínez-López, Burton, & Mur, 2018).One study’s sensitivity analysis showed that for both ASF and CSF, the likelihood of detecting illegal products was highly correlated with the final risk of disease introduction.This means that an increase in customs detection of products brought by commercial passengers largely reduces the risk of a CSV or ASF introduction into the US (Jurado, Paternoster, Martínez-López, Burton, & Mur, 2018).

Pork products were seized recently in the USA and Japan

Recently, on October 15th, 2018 a customs and border protection beagle found a whole roasted pig in the luggage of a traveler from Ecuador(Lieu, 2018) at the Hartsfield-Jackson Atlanta airport. Ecuador as any other South American country is ASF negative, but CSF continues to be present in the country. It is unknown whether the smoked pig has been tested for CSF, but the case is a perfect example of the variety of products that are being transported to the US.

On October 1st, Japanese customs officials confiscated a pork sausage from a Beijing traveler. The sausage tested positive for ASF (Reuters). African Swine Fever has also been found at a South Korean airport in pork products brought in a commercial passenger airline from China (Reuters). All of these examples highlight the reality of the risk illegally imported products carried by commercial travelers play in FAD introduction.

It is important for the swine community to be aware of these risks, to be aware of what food products are being brought to their sites by people, and to push for effective prevention methods. It also highlights the need of the swine community to communicate this risk to the non-swine community to raise awareness and thus contribute to protecting the industry. By using research that helps identify where the highest risks lie spatially and temporally, as well as flights from which countries represent risk, better prevention methods can be developed and implemented.