How is batch farrowing systems affecting the outcome after a PRRS outbreak?
Moving away from weekly batch management improved Time to stability, Time to baseline production and Total Piglet losses per 1,000 sows after a PRRS outbreak.
Daniel Linhares
College of Veterinary Medicine, Iowa State University - United States Author
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New tools for PRRS virus monitoring: When to use each one
In this article we will focus the discussion on the practical applications of the new monitoring systems.
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Current status of PRRS in the US: some challenges and opportunities
Here we will focus the discussion on the practical applications and on lessons learned from recent field studies on response strategies for PRRSV management in affected breeding herds.
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PRRSv control including 1-4-4 L1C
With more herds breaking with highly virulent PRRS strains, what can we do to prevent and control infection? How does the 1-4-4 L1C strain differ?
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Highly pathogenic PRRSV 1-4-4 L1C variant: emergence, sources, and implications to the global industry
This PRRSV strain is affecting the U.S. Understanding where these viruses come from can help us stop this cycle.
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Which route of exposure is best for Mycoplasma hyopneumoniae gilt acclimation?
Intranasal and intratracheal inoculation routes as well as aerosolization with foggers are discussed.
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PRRSV surveillance on the breeding herd - is oral fluids from suckling piglets an alternative?
Oral fluids are practical, fast, easy, cost-effective and reliable methods for sampling pig populations, but it has not been easy or practical to obtain such samples from suckling piglets...
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PRRS: Time to stability and time to baseline production study
The purpose of this study was to compare efficacy of LCE (load-close-expose) using attenuated PRRSV to that using live-virus exposure on breeding herds acutely infected with PRRSv.
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02-Jan-2017Daniel LinharesDr DeBuse --
Thank you for the comments.
On the "economic question" - we reported that using MLV as part of load-close-expose was economically advantageous over live-virus (LVI) as the production impact on vaccinated herds was significantly less than that of live-virus-exposed herds (full manuscript with the model is available at http://dx.doi.org/10.1371/journal.pone.0144265).
On the virus vs no-virus exposure, good question. I agree that we need more field studies on PRRS control/elimination. Experimental research (at isolation units, controlled conditions) are great to generate hypothesis, but field studies are crucial to validate those concepts on actual farms (real life). I understand that mixing viruses creates opportunities of creating new variations, but also understand that attenuated (or attenuated-like) viruses are economically preferable to producers, when compared to wild-type virulent viruses. No virus is better than an attenuated virus, but sometimes in high density areas the chances of keeping naive herds is limited - that's where "living with" attenuated virus is an option to consider.
On another observational (field) study (manuscript to be submitted in February 2017) we described the success rate of achieving stability (TTS) was significantly lower in herds with no whole-herd exposure to PRRSV, when compared to herds that did load-close-expose. We shared the findings of that study at Leman conference and at the North American PRRS symposium (Chicago) last month.
Thanks again for the comments and discussion.
Happy new year.
Thank you for the comments.
On the "economic question" - we reported that using MLV as part of load-close-expose was economically advantageous over live-virus (LVI) as the production impact on vaccinated herds was significantly less than that of live-virus-exposed herds (full manuscript with the model is available at http://dx.doi.org/10.1371/journal.pone.0144265).
On the virus vs no-virus exposure, good question. I agree that we need more field studies on PRRS control/elimination. Experimental research (at isolation units, controlled conditions) are great to generate hypothesis, but field studies are crucial to validate those concepts on actual farms (real life). I understand that mixing viruses creates opportunities of creating new variations, but also understand that attenuated (or attenuated-like) viruses are economically preferable to producers, when compared to wild-type virulent viruses. No virus is better than an attenuated virus, but sometimes in high density areas the chances of keeping naive herds is limited - that's where "living with" attenuated virus is an option to consider.
On another observational (field) study (manuscript to be submitted in February 2017) we described the success rate of achieving stability (TTS) was significantly lower in herds with no whole-herd exposure to PRRSV, when compared to herds that did load-close-expose. We shared the findings of that study at Leman conference and at the North American PRRS symposium (Chicago) last month.
Thanks again for the comments and discussion.
Happy new year.
Assessing impact of 174 PRRSv on wean to finish pig health
A method to quantify the relative economic importance of pig health status at placement by specific pathogens (PRRSv and PEDv) and to estimate the effect of a specific type of PRRSv at a specific production system is presented.
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Clinical case: Vesicular disease in pigs associated with Senecavirus A infection
It seems we have a new virus able to produce vesicular disease in pig populations.
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Epidemic transient neonatal losses and Senecavirus A
Senecavirus A (SVA) has been suggested as a causative agent of idiopathic vesicular disease in pigs. Additionally, a neonatal losses syndrome, affecting piglets of 0-7 days of age, associated with SVA has recently been reported.
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PRRSv stability in manure and implications for transport biosecurity
About 50% of the vehicles used for transporting pigs in the United States are not washed between loads, so this article evaluates the ability of heating treatments to inactivate PRRSv present in manure-contaminated environments.
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Dealing with PRRSv-positive breeding herds
Is the right strategy to get a farm stable, that is, control clinical signs reducing the economic impact of the disease; or should a farm adopt strategies to go “negative”? As for other questions in the epidemiological field, our answer is “it depends”.
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16-Dec-2013jeffrey-chenvery useful opinion.i believe and i will try in our sow farm
