ArticleBMC veterinary research2014
Adverse effects of Influenza A(H1N1)pdm09 virus infection on growth performance of Norwegian pigs - a longitudinal study at a boar testing station.
Article in BMC veterinary research, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 22 papers, 1 of them a synthesis that pooled it.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Who cites it
22 citing papers in PubMed, 1 synthesis or guideline pooled it.
- Mechanistic Models of Influenza Transmission in Commercial Swine Populations: A Systematic Review.Pathogens (Basel, Switzerland) · 2024Pooled it
- Litter-Level Agreement of RT-qPCR Results for Influenza A Virus Between Oropharyngeal Swab, Udder Wipe, and Nasal Wipe Samples Collected in Chilean Swine Breeding Herds.Animals : an open access journal from MDPI · 2026Article
- Epidemiology of Influenza A virus in Swiss pig herds: subclinical circulation and associated risk factors.Porcine health management · 2026Article
- Influenza A virus infection dynamics in two sow herds and effects of interventions.Porcine health management · 2026Article
- Assessing the relationship between the gut microbiota and growth traits in Chinese indigenous pig breeds.BMC veterinary research · 2025Article
- Quantifying the impact of vaccination on transmission and diversity of influenza A variants in pigs.Journal of virology · 2024Article
- Effect of stabilizers on the detection of swine influenza A virus (swIAV) in spiked oral fluids over time.Porcine health management · 2024Article
- Influenza surveillance in pigs: balancing act between broad diagnostic coverage and specific virus characterization.Porcine health management · 2024Article
- Utilizing productivity and health breeding-to-market information along with disease diagnostic data to identify pig mortality risk factors in a U.S. swine production system.Frontiers in veterinary science · 2023Article
- Vaccination against swine influenza in pigs causes different drift evolutionary patterns upon swine influenza virus experimental infection and reduces the likelihood of genomic reassortments.Frontiers in cellular and infection microbiology · 2023Article
- Evaluation of internal farm biosecurity measures combined with sow vaccination to prevent influenza A virus infection in groups of due-to-wean pigs.BMC veterinary research · 2022Article
- Longitudinal Projection of Herd Prevalence of Influenza A(H1N1)pdm09 Virus Infection in the Norwegian Pig Population by Discrete-Time Markov Chain Modelling.Infectious disease reports · 2021Article
- The epidemiology of swine influenza.Animal diseases · 2021Review
- A descriptive study of acute outbreaks of respiratory disease in Norwegian fattening pig herds.Acta veterinaria Scandinavica · 2020Article
- A Systematic Review Analyzing the Prevalence and Circulation of Influenza Viruses in Swine Population Worldwide.Pathogens (Basel, Switzerland) · 2020Review
- Effect of strain-specific maternally-derived antibodies on influenza A virus infection dynamics in nursery pigs.PloS one · 2019Article
- Experimental infection of pigs with H1 and H3 influenza A viruses of swine by using intranasal nebulization.BMC veterinary research · 2018Article
- Seroprevalence of economically important viral pathogens in swine populations of Trinidad and Tobago, West Indies.Tropical animal health and production · 2017Article
- Influenza Herd-Level Prevalence and Seasonality in Breed-to-Wean Pig Farms in the Midwestern United States.Frontiers in veterinary science · 2017Article
- Occurrence and spread of influenza A(H1N1)pdm09 virus infection in Norwegian pig herds based on active serosurveillance from 2010 to 2014.Epidemiology and infection · 2016Article
Corrections and comments
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Authors and funding
9 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundInfluenza A(H1N1)pdm09 virus infection in Norwegian pigs was largely subclinical. This study tested the hypothesis that the infection causes negligible impact on pigs' growth performance in terms of feed conversion efficiency, daily feed intake, daily growth, age on reaching 100 kg bodyweight and overall feed intake. A sample of 1955 pigs originating from 43 breeding herds was classified into five infection status groups; seronegative pigs (n = 887); seropositive pigs (n = 874); pigs positive for virus at bodyweight between 33 kg and 60 kg (n = 123); pigs positive for virus at bodyweight between 61 kg and 80 kg (n = 34) and pigs positive for virus at bodyweight between 81 kg and 100 kg (n = 37). Each pig had daily recordings of feed intake and bodyweight from 33 kg to 100 kg. Marginal effects of the virus infection on the outcomes were estimated by multi-level linear regression, which accounted for known fixed effects (breed, birthdate, average daily feed intake and growth phase) and random effects (cluster effects of pig and herd).
resultsThe seropositive and virus positive pigs had decreased (P value<0.05) growth performance compared to seronegative pigs even though feed intake was not decreased. Reduced feed conversion efficiency led to lower average daily growth, additional feed requirement and longer time needed to reach the 100 kg bodyweight. The effects were more marked (P value<0.03) in pigs infected at a younger age and lasted a longer period. Despite increased feed intake observed, their growth rates were lower and they took more time to reach 100 kg bodyweight compared to the seronegative pigs.
conclusionOur study rejected the null hypothesis that the virus infection had negligible adverse effects on growth performance of Norwegian pigs.
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