Analyzing Swine Feed Ingredients and Pork Products from ASF Affected Countries

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, Dr. Gil Patterson, Chief Medical Officer at VetNOW shares a summary of his publication in Transboundary and emerging Diseases, focusing on swine feed ingredients and pork products imported from countries affected by African Swine Fever.

Key Points

  • Feed and feed ingredients can act as an introduction pathway for African swine fever into the US that needs to be considered
  • Analysis focusing on high-risk products from ASF positive countries can help identify entry pathways into the US and assess risk
  • The ability to focus in on different products, entry pathways, and country of origin provides flexibility to address a range of questions
Continue reading “Analyzing Swine Feed Ingredients and Pork Products from ASF Affected Countries”

Average time sites stay in a naïve PRRSV status: Preliminary Results

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.

Key points

  • Up to February 2021, 209 breeding herd moved to a PRRS naïve status a total of 259 times.
  • On average, sites remained naïve approximately two years before changing to a different status.
  • Most naïve sites moved to an active PRRSV break status in an average one and a half years.
Continue reading “Average time sites stay in a naïve PRRSV status: Preliminary Results”

Phylogenetic Structure and Sequential Dominance of Sub-Lineages of PRRSV Type-2 Lineage 1 in the United States

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.

Keypoints

  • Lineage 1 PRRSv, the most prevalent PRRSV lineage in the U.S, can be sub-divided into eight sub-lineages
  • We documented the cyclic emergence and turnover of different lineages and sub-lineages (about every 3 years) based on both sequence count data and estimated past viral population sizes inferred from genetic diversity through time.
  • The eight sub-lineages differed in key GP5 amino acid sites that are thought to be involved in the immune response to the virus.
Continue reading “Phylogenetic Structure and Sequential Dominance of Sub-Lineages of PRRSV Type-2 Lineage 1 in the United States”

MSHMP data collection update 2020-2021

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.

Reaching the end of the fiscal year, we wanted to report an update on the magnitude of the MSHMP project by describing the data collected and maintained in the MSHMP database that is used to create our reports and to analyze industry related questions and trends.

Breakdown of MSHMP Participants: 37 separate systems made up of 3 regional projects and 31 Production companies and veterinary clinics. Three companies are represented by multiple MSHMP systems due to geographic and management considerations. 

There are a total of 2,073 farms within the program, 1,168 breeding herds, 872 growing pig farms and 30 boar studs. The total number of sows monitored in our project is 3,503,287 sows (>3.5 million sows)

The average number of breeding herd per system is 32 (min of 5 and max of 239) with the 50% of the systems having 18 farms or more.

The mean inventory per farm by system (excluding finisher farms) was 2916 sows (ranging those means from 700-6500). Figure 1 shows farm’s average inventory distribution per participant system.

Different production types are recorded with 56% of breeding herds, and 38% represented by wean to finish and finisher farms from four participant systems (Table1). 

Approximately 20 % of the sow farms are filtered, with 50 being not filtered, 27 partially filtered (filtered only during certain months of the year), and 167 filtered year-round. We are collecting information on the type of filtration system (i.e. positive/negative). Approximately 20% of the farms have reported it, with most of them using positive filtration. 

At MSHMP we are currently collecting status for three pathogens causing important impact to the industry. Over the 2020-2021 year, 1056, 1176, and 1170 farms reported status for PRRS, PED, and PDCoV respectively. Farm status regarding Mycoplasma was recorded for eight production systems, comprising 106 sow farms.

We would like to thank all MSHMP participants for the willingness to share your information. Without their contributions, we could not generate these summaries.

African Swine Fever Detected in the Dominican Republic for the first time in 40 years!

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.

Given the recent unfortunate news regarding the detection of African Swine Fever (ASF) in the Dominican Republic, we thought that briefly reviewing the history of this virus in the Americas would be relevant to the U.S. industry.  It’s important to remind everyone that this is not the first time ASF has been in the Western Hemisphere, and it may not be the last.

Continue reading “African Swine Fever Detected in the Dominican Republic for the first time in 40 years!”