1. National Institute of Agricultural Technology (INTA) , General Villegas, Buenos Aires, B6230DCB , Argentina
2. Elizalde & Riffel Private Consultants , Rosario, Santa Fe, S2000ACD , Argentina
3. PHIBRO Animal Health Corporation, CABA , Buenos Aires, C1107AFL , Argentina
4. PHIBRO Animal Health Corporation , Campinas, São Paulo, 13025-170 , Brazil
5. Department of Diagnostic Medicine/Pathobiology, Kansas State University , Manhattan, KS, 66506
6. Department of Animal Science, Texas A&M University , College Station, TX, 77843-2471