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Nursery pig health and performance

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Title: Nursery pig health and performance
Author: De Bruyn, Karen Marie
Department: Department of Population Medicine
Program: Population Medicine
Advisor: Friendship, Robert
Abstract: The growth performance and the presence of common respiratory pathogens were studied. Fifty nurseries were sampled including farms that routinely used in-feed antimicrobials (conventional), and farms that used no antimicrobials. These latter farms were classified as “raised-without-antibiotics” (RWA) and organic. No difference was found between the growth rates of RWA and conventional nursery pigs (P > 0.05), while organic pigs grew slower than conventional pigs (P < 0.001). Based on serology, approximately a third of nurseries were seropositive for porcine reproductive and respiratory syndrome virus and this had a negative impact on individual pig growth rates. 80 % of nurseries were seropositive for influenza A virus. It was observed that most farms vaccinated weaned pigs for Mycoplasma hyopneumoniae so seroprevalence was not possible to assess. Despite vaccination, 73 % of these nurseries were classified as seronegative based on samples taken from pigs at the end of the nursery stage.
URI: http://hdl.handle.net/10214/17464
Date: 2019-09
Rights: Attribution 4.0 International
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Attribution 4.0 International Except where otherwise noted, this item's license is described as Attribution 4.0 International