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This study was conducted at the Centre for Research Teaching and Extension in Tropical Livestock of the National Autonomous University of Mexico. During the latter part of 1986 and throughout 1988 and 1989, the herd of Holstein × Zebu cattle at the University was tested for IgG antibodies to 21...

Barajas-Rojas, J. A.; Riemann, H. P.; Franti, C. E.
Revue Scientifique et Technique - Office International des Épizooties, 1993, 12, 3, pp 717-732

Morales, S. E.; Ledesma, M. N.; Constantino, C. F.; Puente, C. E.; Silva, S. P.
Veterinaria México, 1994, 25, 4, pp 353-356

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