RESEARCH ▶▶▶
Feed additives mitigate the effect of pig disease viruses in feed
Recently published study results show the effect of different commercial additives on mitigating the transmission of three serious viral pig diseases through feed.
BY TREENA HEIN R
The picture shows the ice block used in the study, con- taning concen- trations of PRRSv, SVA and PEDv.
esults from a new collaborative study have recently been published in the journal Transboundary and Emerging Diseases, in which 15 commercial addi- tives were tested to evaluate their effect on mitigat-
ing Senecavirus A (SVA), Porcine Epidemic a virus (PEDv) and Porcine Reproductive and Respiratory Syndrome virus (PRRSv) in contaminated feed. A wide range of organic substances were tested across the additives, from essential oils and mon- ovalent or multivalent organic acids to short, medium, and long-chain fatty acid blends and formaldehyde-based prod- ucts. “In 14 of the 15 additives tested, pigs on the supplement- ed diets had significantly greater average daily weight gain, significantly lower clinical signs and infection levels, as well as
numerically lower mortality rates compared to the control pigs,” says Dr Scott Dee, director of applied research at Pipe- stone Veterinary Services in Pipestone, Minnesota. “We con- cluded that these additives mitigated the effects of the three viruses we invrestigated in contaminated feed, resulting in im- proved health and performance as compared to pigs fed non-mitigated diets,” says Dr Dee. “It’s exciting that producers and veterinarians now have options for use in a feed biosecu- rity programme. However, it’s important to note that the prod- ucts tested in this study do not yet have label approval claim- ing efficacy against viruses. Many companies are collaborating with the FDA to move this forward.” The effects of several of these feed additives in combating African Swine Fever virus (ASFv) are currently being carried out by Dr Niederwerder at her lab facility, which is certified to handle this virus.
Building on past science This study builds on findings (from the same group of re- searchers and others) that have demonstrated that these same pig viruses can survive in feed. The capability of live- stock feed to transmit viral diseases was first proven scientifi- cally by Dr Pipestone in 2014 during the PEDv epidemic in North America. “Since that time, various feed additives have been evaluated in lab settings for their effect on viral viability and infectivity in contaminated feed using bioassay piglet models,” Dee explains. “However, studies that involve the
30 ▶ ALL ABOUT FEED | Volume 28, No. 7, 2020
PHOTO: DR. SCOTT DEE
PHOTO: HANS PRINSEN
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