Browsing Facultad de Ciencias de la Salud by Author "Frankena, K."
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Effect of a killed whole Neospora caninum tachyzoite vaccine on the crude abortion rate of Costa Rican dairy cows under field conditions
Pérez, E.; Frankena, K.; ROMERO-ZUÑIGA, JUAN JOSÉ (Elsevier B.V, 2004-06-04)A standard field trial was carried out to assess the effect of a commercial Neospora-vaccine based on whole killed tachyzoites (Bovilis–Neoguard, Intervet1) on the abortion rate. Eight hundred and seventy-six cows, over ... -
Effect of neosporosis on productive and reproductive performance of dairy cattle in Costa Rica
ROMERO-ZUÑIGA, JUAN JOSÉ; Van Breda, S.; Vargas, Bernardo; Dolz, Gaby; Frankena, K. (Elsevier B.V, 2005-12)A cross-sectional study was conducted to assess the effect of neosporosis on productive and reproductive parameters in dairy cows. Cows (n = 2743) from 94 farms located in the most important dairy areas in Costa Rica were ... -
Factors associated with Neospora caninum serostatus in cattle of 20 specialised Costa Rican dairy herds
ROMERO-ZUÑIGA, JUAN JOSÉ; Pérez, E.; Dolz, Gaby; Frankena, K. (Elsevier B.V, 2002-04-15)Twenty-five specialised Costa Rican dairy farms (located in the Poás area) were used to determine neosporosis seroprevalence and the association of seropositivity with environmental and management factors. The farms involved ... -
The effect of the dam–calf relationship on serostatus to Neospora caninum on 20 Costa Rican dairy farms
Romero-Zúñiga, Juan José; Frankena, K. (Universidad Nacional, Costa Rica, 2003-03-31)An epidemiological study was conduced on 20 dairy herds previously diagnosed as seropositive for Neospora caninum. The number of females per farm varies from 41 to 296. All females present on the farms were bled once in ...