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Porcine Reproductive & Respiratory Syndrome (PRRS)
Porcine reproductive and respiratory syndrome (PRRS) was first reported in the USA in 1987. Since then, outbreaks of PRRS and successful isolation of the virus have been confirmed throughout North America, Asia, South America, Africa, and Europe.
The etiologic agent of porcine reproductive and respiratory syndrome is a virus in the group Arteriviridae. The virus is enveloped and ranges in size from 45 to 80 mm. Inactivation is possible after treatment with ether or chloroform; however, the virus is very stable under freezing conditions, retaining its infectivity for 4 months at -70°C (-94°F). As the temperature rises, infectivity is reduced (15–20 minutes at 56°C [132.8°F]).
After infection of a naive herd, exposure of all members of the breeding population is inconsistent, leading to development of naive, exposed, and persistently infected subpopulations of sows. This situation is exacerbated over time through the addition of improperly acclimated replacement gilts and leads to shedding of the virus from carrier animals to those that have not been previously exposed.
The primary vector for transmission of the virus is the infected pig and contaminated semen. Controlled studies have indicated that infected swine may be long-term carriers, with adults able to shed PRRS virus for up to 86 days after infection, and weaned pigs able to harbor virus for 157 days. Experimentally infected boars can shed virus in the semen up to 93 days after infection.
There has been a lot in the news lately on both PEDV (Porcine Epidemic Diarrhea Virus) and PRRS (Porcine Reproductive and Respiratory Syndrome). On PEDV, Jordan Anderson wrote an article “9 tips to block PEDV, she also quotes South Dakota State University Extension Swine Specialist Bob Thaler who has several writings on PEDV (1). The main culprit in the spread of PEDV is by contaminated manure (2). It only takes a very small amount of contaminated manure to...
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I am a small pig farmer in Thailand (80 sow / 8 boars / 60 gilt farm). Our farm primarily is in the business of raising piglets for sale at 35 days as market finishing pigs - we only raise finish pigs from piglets that do not reach our standards for sale to the public. We also raise gilts and sell sperm. In Thailand, and all bordering countries, there is currently a large problem with PRRS. We, piglet sellers, were first restricted to selling piglets...
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Effect of Sc 47 probiotic yeast on the health and zootechnical performance of weaned piglets
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1. Introduction Porcine reproductive and respiratory syndrome (PRRS) is a highly contagious viral disease that was first recognized almost simultaneously in Western Europe (Wensvoort et al., 1991) and North America in the late 1980s (Keffaber, 1989). The causative agent is PRRS virus (PRRSV), a small single-stranded positive sense RNA virus, classified in the order Nidovirales, family Arteriviridae and genus Arterivirus. Since its appearance,...
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ABSTRACT This document focuses on the use of a program based on specific avian antibodies to neutralize PRRSV in a multisite farm of 1,100 swine in Central Mexico; farm stability is shown in S/P values. High values when starting program and a decrease as the program continues; also the samples as the program develops along with a repopulation in 2006 and 2007 with 700 replacement sows negative to PRRSV without S/P...
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It is widely recognized that a large variation in productivity and profitability exists between farms in a country, and similarly, between countries in a global economy. Some profitability variables are due to cost of inputs and management and these are controllable by producers; other factors are not so easily predicted or controlled, for example: 65% of income variation is estimated to be due to: Feed conversion, ...
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The porcine Circovirus type 2 (PCV2) is considered an important emerging pathogen in swine production. It has been associated to different syndromes and porcine diseases like the Porcine Dermatitis and Nephropathy Syndrome (PDNS) and the Post weaning Multisystemic Wasting Syndrome (PMWS). There have been found other infectious agents associated to PCV2, like the Aujeszky's disease Virus (ADV), Porcine Parvovirus (PPV), Porcine Reproductive Respiratory Syndrome Virus...
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Vietnamese animal health officials predict that foot and mouth disease (FMD), blue-ear disease (PRRS) and highly pathogenic avian influenza (HPAI) will soon return to the south of the country.
The Department of Animal Health under the Ministry of Agriculture and Rural Development report that foot-and-mouth disease is now in the Tay Nguyen (Central Highland) province of Dak Nong and central provinces of Quang Ngai, Quang Tri, Quang Binh and Ha Tinh.
It also said blue-ear disease,...
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Editor's Note: Dr. Scott Dee of the Swine Disease Eradication Center, University of Minnesota College of Veterinary Medicine was invited to deliver a lecture at the AD Leman Conference, "The future of PRRS in North America: What will the next decade bring"? Dr. Dee's expertise in PRRS research positions him well to comment on this important topic.
I appreciate the opportunity to present my vision of the future of porcine reproductive and respiratory syndrome (PRRS) in North...
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MJ Biologics, in conjunction with the University of Minnesota, announces a breakthrough in the control and prevention of porcine reproductive and respiratory syndrome disease (PRRS), a devastating disease of pigs worldwide. Research conducted by MJ Biologics and the University has led to the decoding of the PRRS virus and the development of a new inactivated subunit vaccine. Patent-pending Selectigen MJPRRS™ technology now offers veterinarians and swine producers a new tool in the...
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Several trials in Kansas have demonstrated that circovirus vaccination improves the performance of growing pigs even on high health farms. On a 300 sow, PRRS negative farm with a history of PCVAD, 235 animals were vaccinated with a porcine circovirus type 2 (PCV2) vaccine at three and six weeks of age. They were housed in the same pens as 250 control (non-vaccinated) animals. Mortality rate and growth rate were significantly better in vaccinated pigs. In the wean to finish stage, the...
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Agricultural Research Service (ARS) scientists are part of a team that has found a vital clue for battling a disease called porcine reproductive and respiratory syndrome virus (PRRSV), which costs U.S. swine producers about $560 million annually. PRRSV-infected pigs are susceptible to pneumonia and reproductive losses, and infected sows give birth to weak piglets. It can take weeks or even months for them to recover from the virus, which evolves and adapts quickly to environmental...
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Effect of Sc 47 probiotic yeast on the health and zootechnical performance of weaned piglets
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At first, it was just some of the piglets. The mother gave birth to 13, all of them stillborn. Within a few weeks, however, she and other adult pigs in neighboring stalls became feverish and died. By the end of the summer, all but a handful of the village's 300 pigs had succumbed to the mysterious disease. "It was quick, very quick. Before we knew something was wrong, they were all dead," said Lo Jinyuan, a 55-year-old pig farmer in the village of Shandi. Moving rapidly...
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China is stepping up efforts against an outbreak of deadly pig disease that has spread through much of the vast nation and sent pork prices skyrocketing, the Agriculture Ministry said Thursday. Blue ear, also known as porcine reproductive and respiratory syndrome, has infected 280,000 pigs since the start of the year, killing more than 70,000, chief veterinary officer Jia Youling was quoted as saying at a news conference by the official Xinhua News Agency. China has already...
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Danish pig producers have today entered into a settlement with Boehringer Ingelheim Denmark A/S in a court case concerning the vaccination of Danish pig herds with a vaccine, which is used to prevent the dreaded pig disease Porcine Reproductive and Respiratory Syndrome (PRRS).
This settlement will close the case filed by Danish Meat Associations, a Danish farmer organisation.
Boehringer Ingelheim, the manufacturer of the vaccine, had first negotiations with the lawyer representing a...
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Porcilis PRRS and the new Porcilis M Hyo are two of the spearhead products which Intervet arms you with to help to fight PRDC in pigs.
PRDC has been a well-debated and well-researched subject. However, world-class speakers will be revealing new information on M. hyopneumoniae and PRRS that will have a significant impact on how we can control these pathogens in the future.
The A1 Auditorium is also used during the plenary sessions of the IPVS. It is the perfect place to...
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A preconference workshop focused on Postweaning Multisystemic Wasting Syndrome (PMWS) was held at the American Association of Swine Veterinarians’ annual meeting in Kansas City, Mo.
The presentations included in the workshop supported the following points:
• PMWS is not a food safety or public health issue.
• PMWS associated with Porcine Circovirus-2 (PCV-2) has been present in the U.S. since the 1990s.
• A more severe form of the disease has recently been reported in eastern Canada...
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The American Association of Swine Veterinarians' (AASV) board of directors approved the formation of the North American PRRS Eradication Task Force following a proposal from AASV President Dr. Scott Dee.
Individuals serving on the Task Force, to be named by the AASV PRRS Committee, will represent stakeholders from across North America including practitioners, researchers and producers. The goal of this task force will be to serve as a steering committee to provide direction, knowledge...
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A quick email survey of pig vet specialists suggests that finisher mortality rates have increased this winter and in particular the number of sudden deaths in otherwise “good” pigs.
Cases investigated seem to have been of acute respiratory disease (Pasteurella, Strep suis Haemophilis parasuis and APP have been isolated), PDNS and bloody gut (the increased amount of wheat or the new strains fed possibly involved?). In Scotland there have been a few herds with increases in PDNS and late PMWS...
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Porcine reproductive and respiratory syndrome, which affects the majority of the nation's swine, will be the featured topic at the 46th annual University of Nebraska-Lincoln George A. Young Swine Health and Management Conference.
The Aug. 11 conference, "Achieving the Best of Production Through Knowledge," will be at the Marina Inn in South Sioux City, Neb. Registration for the one-day seminar begins at 8 a.m.
"Porcine reproductive and respiratory syndrome, or PRRS, is the leading...
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