B. Sánchez-Muñoz, J. Nahed-Toral, J.L. Ruiz-Rojas, E. Pérez-Vázquez y R. Solis-Zabaleta
Issue:
106-2 (89-99)
Topic:
Animal Production
Keywords:
BHV-1, antibodies, dairy farms, rural production societies
Summary:
This study characterizes the bovine production system, analyzes its approximation to the organic production
model, and evaluates seroprevalence of antibodies for the bovine herpes virus type 1 (BHV-1),
the causal agent for Infectious Bovine Rhinotracheitis (IBR) in adult bovines without previous vaccination
in 51 dairy farms in transition toward organic production in three rural production societies (RPS;
Grijalva: G; Malpaso: M; Pomarrosa: P) in the municipality of Tecpatan, Chiapas, Mexico. Blood samples
were taken for 213 dairy cows and 26 breeding bulls using an enzymatic immune assay (ELISA) in order
to detect antibodies. The dairy farms in the three RPS make up a single production system, whose
objectives, management characteristics, approximation to the organic production model (63,4%) and
productivity (108,2 ± 9,4 euros of net margin per cow per year) are similar. Global seroprevalence was
62,76%, for a total of 150 samples. Seroprevalence for BHV-1 observed for dairy cows (RPS-G = 66,7%,
RPS-M = 58,8%, and RPS-P = 53,8%) and that for breeding bulls (RPS-G = 100%, RPS-M = 88,9, RPS-P =66,7) did not significantly differ among the three RPS. In both cases, seroprevalence was only marginally
significant for RPS-G and RPS-P. Results suggest implementation of effective IBR preventative
management systems respecting the organic production guidelines.
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