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Background: Family oral fluids (FOF) sampling has been described as a sampling technique where a rope is exposed to sows and respective suckling litters and thereafter wrung to obtain fluids. PCR-based testing of FOF reveals presence of PRRS virus RNA only at the litter level, as opposed to conventional individual-animal-based sampling methods that demonstrate PRRSV RNA at the piglet level. The relationship between the PRRSV prevalence at the individual piglet level and at the litter level in a farrowing room has not been previously characterized. Using Monte Carlo simulations and data from a previous study, the relationship between the proportion of PRRSV-positive (viremic) pigs in the farrowing room, the proportion of litters in the farrowing room with at least one viremic pig, and the likely proportion of litters to be positive by a FOF RT-rtPCR test in a farrowing room was characterized, taking into account the spatial distribution (homogeneity) of viremic pigs within farrowing rooms.
Results: There was a linear relationship between piglet-level- and litter-level prevalence, where the latter was always larger than the former. When the piglet-level prevalence was 1%, 5%, 10%, 20%, and 50%, the true-litter level prevalence was 5.36%, 8.93%, 14.29%, 23.21%, and 53.57%, respectively. The corresponding apparent-litter prevalence by FOF was 2.06%, 6.48%, 11.25%, 21.60%, and 51.56%, respectively.
Conclusion: This study provides matching prevalence estimates to help guide sample size calculations. It also provides a framework to estimate the likely proportion of viremic pigs, given the PRRSV RT-rtPCR positivity rate of FOF samples submitted from a farrowing room.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10099699 | PMC |
http://dx.doi.org/10.1186/s40813-023-00309-x | DOI Listing |
J Anim Sci
December 2024
North Carolina Agricultural and Technical State University, Department of Animal Sciences, Greensboro, NC, 27411; Unites States of America.
Lactating sows and their litters are particularly vulnerable to heat stress (HS). Heat stress decreases sow fertility, feed intake, milk production, and litter growth. Approaches are needed to mitigate the negative effects of HS on animal welfare and oxidative damage to tissues.
View Article and Find Full Text PDFTransl Anim Sci
October 2024
Carthage Innovative Swine Solutions, Carthage Veterinary Service Ltd., Carthage, IL 62321, USA.
Farrowing durations that exceed 240 min cause stillborn rates to increase. Therefore, feeding strategies in late gestation have been studied to mitigate the negative consequences of extended farrowing durations. A total of 1,501 sows (PIC 1050 Camborough) were used for this study at two individual farms near Carthage, IL.
View Article and Find Full Text PDFTransl Anim Sci
October 2024
Department of Animal Science, Iowa State University, Ames, IA 50011, USA.
Three hundred and sixty sows were used to investigate the effect of various dietary branched-chain amino acids (BCAA) levels on sow lactation and piglet growth performance. On day 112 ± 1.4 of gestation, sows were blocked by the parity group (P1, P2, P3+) and randomly assigned to 1 of 6 dietary treatments containing various levels of standardized ileal digestible (SID) Leu, Ile, and Val.
View Article and Find Full Text PDFTransl Anim Sci
September 2024
Carthage Veterinary Service Ltd., Carthage, IL 62321, USA.
Rotavirus and other pathogenic microorganisms are known to cause scours, respiratory infection, and increased mortality, spread from pig to pig via contaminated equipment, insuffcient washing, and improper disinfection processes in farrowing rooms on commercial sow farms. Pig producers have adopted cleaning procedures and biosecurity policies as an attempt to ensure farrowing rooms are free of infectious organisms before the next group of sows is introduced. Adenosine triphosphate () bioluminescence has been used in other industries to provide real-time feedback on surface cleanliness through the detection of ATP from organic sources.
View Article and Find Full Text PDFTransl Anim Sci
June 2024
Eco-Innovation Research Centre, Department of Science, South East Technological University, Waterford, Ireland.
The few studies that have evaluated hygiene routines in farrowing accommodation to date have focused on pathogen elimination from pens, with little attention paid to pig growth and no information provided on pig health or medication usage. This study aimed to determine if implementation of an optimized farrowing accommodation hygiene routine could improve pig health and growth and reduce medication usage pre- and post-weaning (PW). Forty seven sows were blocked on parity, previous litter size and body weight and assigned to two treatments: T1) Basic hygiene: cold water washing only with minimal drying time; T2) Optimized hygiene: use of detergent and a chlorocresol-based disinfectant with a 6-d drying time.
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