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Neonatal mortality has been increasingly reported on swine breeding farms experiencing swine idiopathic vesicular disease (SIVD) outbreaks, which can be accompanied by lethargy, diarrhea, and neurologic signs in neonates. Seneca Valley Virus (SVV), or Senecavirus A, has been detected in clinical samples taken from pigs with SIVD. Experimental SVV inoculation has caused vesicular disease in pigs, particularly during the stages from weaning to finishing. However, it remains crucial to investigate whether SVV directly contributes to the increase in neonatal mortality rates. The following study was conducted to chronicle the pathogenesis of SVV infection in sows and their offspring. Ten sows were intranasally inoculated with 4.75 × 10 plaque-forming units of the virus per sow either late in gestation (n = 5) or within fourteen days of farrowing (n = 5). Each sow replicated SVV following intranasal inoculation, but only one out of ten sows developed a vesicular lesion on the snout. Evidence of transplacental infection was observed in two litters, and an additional two litters became infected following parturition out of five litters from sows inoculated in late gestation. No clinical signs were observed in the infected neonates. Likewise, no clinical signs were observed in the other five litters inoculated after farrowing, although each piglet did replicate the challenge virus. In this study, the experimental challenge of SVV did not result in neonatal mortality in contrast to observations in the field; however, it has shed light on the pathogenesis of the virus, the transmission of SVV between sows and their offspring, and host immune response that can help shape control measures in the field.
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http://dx.doi.org/10.1016/j.vetmic.2023.109958 | DOI Listing |
J Anim Sci
December 2024
Department of Diagnostic Medicine/Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, KS USA.
A total of 3,307 (PIC L 42) sows and 55,160 piglets were used to determine the effects of different farrowing systems on piglet livability and lifetime growth performance. Treatments were assigned to farrowing rooms and consisted of a conventional farrowing system (sows and piglets housed in individual farrowing stalls) or a pre-weaning socialization system (stall dividers removed between farrowing stalls and walkways within 6 to 24 h post-farrowing such that 12 to 32 litters of piglets were co-mingled). A total of 40 farrowing rooms with 80 stalls each were used with 20 rooms per treatment.
View Article and Find Full Text PDFWorld J Microbiol Biotechnol
December 2024
Hainan Institute, College of Animal Science, Zhejiang University, Hangzhou, 310058, China.
Maternal nutritional supplementation has a profound effect on the growth and development of offspring. FAM is produced by co-cultivation of Lactobacillus acidophilus and Bacillus subtilis and has been demonstrated to potentially alleviate diarrhea, improve growth performance and the intestinal barrier integrity of weaned piglets. This study aimed to explore how maternal FAM improves the reproductive performance through mother-infant microbiota, colostrum and placenta.
View Article and Find Full Text PDFVet Res
December 2024
Animal Breeding and Genetics Program, Institute of Agrifood Research and Technology (IRTA), Caldes de Montbui, Spain.
Breeding animals to produce more robust and disease-resistant pig populations becomes a complementary strategy to the more conventional methods of biosecurity and vaccination. The objective of this study was to explore the ability of a panel of genetic markers and immunity parameters to predict the survival rates during a natural PRRSV outbreak. Ten-week-old female Duroc pigs (n = 129), obtained from 61 sows and 20 boars, were naturally infected with a highly pathogenic PRRSV genotype 1 strain.
View Article and Find Full Text PDFJ Anim Sci
December 2024
Department of Animal and Dairy Sciences, Mississippi State University, Mississippi State, MS, 39762, USA.
The neuroendocrine hormone melatonin is associated with circadian rhythms and has antioxidant and vasodilative properties. In cattle, melatonin rescues fetal growth during maternal nutrient restriction in a seasonally dependent manner, but melatonin research in swine is limited. The objective of this study was to evaluate effects of dietary melatonin supplementation during mid to late gestation on circadian rhythm and muscle growth and development of the longissimus dorsi in utero and postnatally.
View Article and Find Full Text PDFFront Vet Sci
November 2024
Wen's Food Group, Yunfu, China.
In recent years, NADC34-like strains of porcine reproductive and respiratory syndrome virus have gradually emerged as mainstream strains on Chinese pig farms. These strains have high mutation rates and can recombine with local strains, representing great challenges to prevention and control efforts. Previously, a new recombinant NADC34-like subtype strain was isolated in our laboratory.
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