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. Torremorell shares the results of a project funded by the Swine Disease Eradication Center on ultraviolet germicidal Chambers in swine farms. Training videos in English and Spanish as well as downloadable handouts are available at z.umn.edu/UVbox
In an effort to examine the role of ingredients, especially vitamins, in feed biosecurity, the Swine Health Information Center (SHIC) and the University of Minnesota organized a vitamin manufacturing sector-wide workshop. Representatives from pork industry organizations including National Pork Board, National Pork Producers Council, American Association of Swine Veterinarians, vitamin manufacturers and blenders, and feed industry associations joined SHIC and the University of Minnesota for the workshop in late April in St. Paul, Minnesota. Participants focused on vitamins and the processes involved prior to delivery to a producer’s farm, with special focus on African swine fever transport and transmission risk.
New methods allow estimation of the overall PRRS-vulnerability risk score by asking 20 or less questions.
This can help producers and veterinarians to (a) measure and benchmark key biosecurity aspects, and (b) toidentify sites at relatively higher (or lower) risk of PRRSv introduction.
Study Summary: This study aimed to identify a small set of biosecurity aspects that, when combined, have a strong association with the frequency of PRRSv introduction into swine breeding herds.
Preliminary Results: A cross-sectional study assessed biosecurity aspects in 84 breeding herds from 14 production systems in 2017. Models were trained to predict whether a farm had or not reported a PRRS outbreak in the past 5 years, given a set of biosecurity aspects. Two methods were used, and both models were able to classify the herds with a great overall performance based on few biosecurity aspects (See figure). The variables used by both methods were related to the frequency of risk events in the farm, swine density around the farm, farm characteristics/ requirements to visitors, and operational connections to other sites.
Note: The Gini coefficient (or index) is a single number aimed at measuring the degree of inequality in a distribution. (Source: Wikipedia) The higher the number, the less equally distributed the farms will be.
When comparing the predicted positive value obtained by the models, they showed a strong positive correlation (0.7 and 0.76, respectively) with the frequency of past outbreaks.
Enroll on our follow-up study: Study farms will be asked to fill a short survey. Using the methods above, the PRRS-vulnerability risk score will be generated for each farm enrolled. The information will be collected via an Excel file and the name of the farms and production systems will be kept confidential.
To enroll or request additional information please contact: Gustavo Silva (gustavos-at-iastate.edu) or Daniel Linhares (linhares-at-iastate.edu) at Iowa State University.