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G.J. Mason 1University of Guelph, Animal Science, Guelph, Ontario N1G 2W1, Canada

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D. Haley 2University of Guelph, Population Medicine, Guelph, Ontario N1G 2W1, Canada; gmason@uoguelph.ca

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L. Dawson 2University of Guelph, Population Medicine, Guelph, Ontario N1G 2W1, Canada; gmason@uoguelph.ca

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