Zobrazeno 1 - 2
of 2
pro vyhledávání: '"HUBER, NANCY L."'
Publikováno v:
American Journal of Epidemiology; Apr1990, Vol. 131 Issue 4, p729-733, 5p
The introduction of new cattle into an established herd raises the possibility that infection or disease may be either introduced or augmented. Herd additions should be free of infection or disease, or at least have rates which do not exceed those of
Externí odkaz:
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