Online Ahead of Print
Articles online ahead of print are accepted, peer-reviewed articles that have not yet been assigned to a volume/issue of Journal of Swine Health and Production (JSHAP), but are citable using the article DOI. When an article is assigned to a volume/issue, the online ahead of print version will be removed from this page and the final version will appear in the associated published volume/issue of JSHAP. The DOI and the date an article was first made available online will be carried over.
A Norwegian observational study of feed conversion efficiency in Duroc and Landrace grower pigs seropositive for influenza A (H1N1) pdm09 virus
Jwee Chiek Er
Abstract
Objective: Investigate the influence of influenza A(H1N1)pdm09 virus (pH1N1v) on feed conversion efficiency (FCE) in Norwegian Landrace and Duroc pigs.
Materials and methods: This observational study analyzed the growth and serological data of 1954 grower pigs collected from 43 nucleus breeding herds in eastern Norway between 2009 and 2012. Serial serological tests, enzyme-linked immunosorbent assay, and hemagglutination inhibition were used to detect pH1N1v antibodies in pigs weighing 100 kg. Statistical analyses included mixed-effects regression modelling, Cox regression, and Kaplan-Meier Failure analysis to assess the effects of breed on pH1N1v influence on growth performance.
Results: Duroc pigs experienced a greater reduction in FCE (5.6%; 95% CI, 5.5%-5.7%) compared to Landrace pigs (3.5%; 95% CI, 1.3%-5.6%) when exposed to pH1N1v. Seropositive pigs of both breeds maintained normal growth rates under ad libitum feeding conditions. To reach 100 kg body weight, seropositive Landrace pigs consumed 2.4 kg (95% CI, 0.9-3.9 kg) more feed, while Duroc pigs consumed 3.8 kg (95% CI, 3.7-4.0 kg) more feed than their seronegative counterparts.
Implications: Results suggest breed-specific differences in resilience to influenza even though the overall appetite of seropositive pigs was unimpaired during the growth phase (approximately 33-100 kg body weight). Study findings highlight the economic implications of selecting appropriate breeds for specific environmental challenges. However, the study’s observational nature limits the ability to infer causality and may not be generalized to other breeds or crossbreeds. By understanding breed-specific responses to influenza, producers can optimize breed selection strategies to enhance overall herd resilience and efficiency, contributing to more sustainable pork production.
Received date: January28, 2024
Accepted date: July 17, 2024
Published online date: December 9, 2024
Evaluating point-of-care testing for anemia diagnosis in pigs: Blood collection location disparities, repeatability, and validity
Katlyn A. McClellan, Crystal L. Levesque, Eric M. Weaver
Abstract
The HemoCue 201 was used to compare hemoglobin (HbC) across blood sampling sites. Tail docking samples had lower HbC than both ear and mammary vein samples (P = .001). Both point-of-care and laboratory HbC testing methods showed agreement, with biases of 0.2 g/dL (ear) and -0.45 g/dL (jugular).
Received date: April 15, 2024
Accepted date: July 17, 2024
Published online date: November 27, 2024