El objetivo del estudio fue determinar los microorganismos asociados a la prevalencia de mastitis subclínica en cabras lecheras de Boyacá. Se realizó un estudio transversal con muestreo por conveniencia y se incluyeron 256 individuos. Las muestras de leche se tomaron en forma aséptica, directamente de la glándula mamaria y se transportaron al laboratorio a una temperatura de 4 °C. En el laboratorio, las muestras fueron sometidas al California Mastitis Test (CMT), y solo aquellas con un valor de CMT 2 y 3 fueron seleccionadas para cultivo microbiano en agares y posteriormente identificadas con pruebas bioquímicas. La prevalencia general de mastitis subclínica fue del 26.56%, lo que corresponde a 136 mitades mamarias. De esta prevalencia, el 73% de las muestras presentaron crecimiento microbiano asociado a la enfermedad. Los principales agentes microbianos asociados a la mastitis s...

Boyacá is Colombia's fifth-largest milk-producing department. Previous studies have shown the importance of Coagulase-negative Staphylococci (CNS) species as causes of subclinical mastitis in dairy herds. This work aimed to determine the antibiotic resistance profile in CNS obtained from subclinical mastitis, and the presence of the mecA gene. CNS DNA was taken from a previous study of the research group, and specific primers were used for the detection of the mecA gene in isolates that showed antibacterial resistance to at least one of the following antibiotics: ampicillin, tetracycline, streptomycin, oxacillin, penicillin, and enrofloxacin. The results show different patterns of antibiotic resistance in the CNS isolates despite being obtained from the same herd. In addition, S. chromogenes and S. epidermidis were the most prevalent pathogens, and with the highest presence of the mecA ...

The aim of this study was to determine the variation of milk urea nitrogen (MUN) concentration according to milk yield and milk protein in Holstein cows in Boyacá, Colombia. Data previously collected (n=4901) over two years were used. Univariate analysis of variance was performed with the variables milk yield (l/day) and milk protein (%) as independent variables and the concentration of MUN as the dependent variable. In addition, a simple linear correlation analysis was performed between each variable. The results showed that MUN values are higher when milk yield is lower, but no statistical differences were found for MUN concentration according to milk protein content. Weak and negative correlation was found between milk yield and MUN concentration, but no significant correlation was found between milk protein and MUN concentration.

The aim of the present study was to determine the presence of antibodies against Neospora caninum in a dairy herd in the municipality of Toca, Colombia. Blood samples (n=100) were collected from females between 1 and 9 years of age. The animals were selected through simple random method of prospective cross-cut. The serum samples were processed using a commercial indirect ELISA kit. The prevalence of antibodies anti-N. caninum was 64%. The association between positive animals with history of abortion and parity was statistically significant (p<0.05), while the association with age, reproductive status and repeat breeding was not significant.

El presente estudio tuvo como objetivo determinar la presencia de anticuerpos contra Neospora caninum en un hato lechero del municipio de Toca, Colombia. Se tomaron 100 muestras de sangre de bovinos de 1 a 9 años de edad, seleccionados mediante un método aleatorio simple de corte transversal prospectivo. Las muestras de suero fueron procesadas mediante un kit comercial de ELISA indirecta. La seroprevalencia de anticuerpos anti-N. caninum fue de 64%. La asociación entre animales positivos con historia de abortos y número de partos fue estadísticamente significativa (p<0.05), en tanto que la asociación con la edad, estado reproductivo y repetición de celos no fue significativa.