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    Do weaner pigs need in-feed antibiotics to ensure good health and welfare?

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    Author
    Diana, Alessia
    Manzanilla, Edgar G.
    Calderon Diaz, Julia A.
    Leonard, Finola C.
    Boyle, Laura A.
    Keyword
    Pigs
    Health
    welfare
    Swine
    Antibiotics
    Date
    2017-10-05
    
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    URI
    http://hdl.handle.net/11019/1523
    Citation
    Diana A, Manzanilla EG, Calderón Díaz JA, Leonard FC, Boyle LA (2017) Do weaner pigs need in-feed antibiotics to ensure good health and welfare? PLoS ONE 12(10): e0185622. https://doi.org/10.1371/journal.pone.0185622
    Abstract
    Antibiotics (AB) are used in intensive pig production systems to control infectious diseases and they are suspected to be a major source of antibiotic resistance. Following the ban on AB use as growth promoters in the EU, their prophylactic use in-feed is now under review. The aim of this study was to evaluate the effect of removing prophylactic in-feed AB on pig health and welfare indicators. Every Monday for six weeks, a subset of 70 pigs were weaned, tagged and sorted into two groups of 35 pigs according to weight (9.2 ± 0.6 kg). AB were removed from the diet of one group (NO, n=6) and maintained in the other group (AB, n=6) for nine weeks. Ten focal pigs were chosen per group. After c. five weeks each group was split into two pens of c.17 pigs for the following 4 weeks. Data were recorded weekly. Skin, tail, ear, flank and limb lesions of focal pigs were scored according to severity. The number of animals per group affected by health deviations was also recorded. The number of fights and harmful behaviours (ear, tail bites) per group was counted during 3×5min observations once per week. Data were analysed using mixed model equations and binomial logistic regression. At group level, AB pigs were more likely to have tail (OR=1.70; P=0.05) but less likely to have ear lesions than NO pigs (OR=0.46; P<0.05). The number of ear bites (21.4±2.15 vs. 17.3±1.61; P<0.05) and fights (6.91±0.91 vs. 5.58±0.72; P=0.09) was higher in AB than in NO pigs. There was no effect of treatment on health deviations and the frequency of these was low. Removing AB from the feed of weaner pigs had minimal effects on health and welfare indicators.
    ae974a485f413a2113503eed53cd6c53
    https://doi.org/10.1371/journal.pone.0189434
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