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The aim of this study was to determine the individual and environmental factors associated to twin birth (TB) in cows from specialized dairy farms in Costa Rica. A descriptive and case-control study was conducted of lactations recorded in the VAMPP Bovino information system between 1994 and 2009....

Murillo-Barrantes, J.; Estrada-König, S.; Rojas-Campos, J.; Bolaños-Segura, M.; Valverde-Altamirano, E.; Romero-Zúñiga, J. J.
Escuela de Medicina Veterinaria, Universidad Nacional de Costa Rica, Heredia, Costa Rica
Revista de Ciencias Veterinarias, 2010, 28, 1, pp 7-21
Cover for paratuberculosis

Johne's disease or paratuberculosis (PTB) caused by Mycobacterium avium subspecies paratuberculosis, initially infects the ileum causing a...

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