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Meza-Herrera CA, Ross TT, Hallford DM, Hawkins DE, Gonzalez-Bulnes A.Meza-Herrera CA, et al. Among authors: hawkins de.Reprod Domest Anim. 2010 Aug;45(4):723-8. doi: 10.1111/j.1439-0531.2009.01341.x. Epub 2009 Feb 10.Reprod Domest Anim. 2010.PMID: 19220796Clinical Trial.