Se evaluaron dos pruebas de campo para determinar la Mastitis Subclinica en bovinos. Se utilizó un total de 268 vacas en producción de leche, entre 1 a 10 partos, en dos sectores San Lorenzo y Miraflores de Levanto. En un sistema extensivo, su alimentación a base de pasturas naturales y cultivadas, un solo ordeño manual, y se consideró desde la segunda semana hasta 5 meses de lactación. Se utilizó el método biológico (Prueba California - Mastitis Test) y el método químico (Prueba de Whiteside), los que permitieron comprobar cuál de las pruebas fue más eficiente para la detección de la mastitis bovina. Los resultados demostraron que el 100 % de prevalencia de mastitis subclínica, según el número de partos, se reporta que el mayor porcentaje de prevalencia se muestra en el 4 parto y según los cuartos mamarios, se reporta que el anterior y posterior derecho reporta el 30 %...

The aim of this study was to evaluate the effect of inactivated feeder cells (feeder layer system) from two segments of the bovine oviduct (isthmus and ampulla) in the in vitro development of bovine embryos. Cell lines from segments of the isthmus and ampulla were generated and subsequently inactivated with mitomycin C (40 μg/ml) to inhibit their ability to divide and eliminate competition for nutrients with embryos. Bovine oocytes were matured in vitro for 24 h and were fertilized for 18 h in conventional culture with Brangus bovine semen. The expected fertilized oocytes were cultured for seven days in the feeder layer system with isthmus and ampulla cells separately at a concentration of 1.44 x 10 5 cells/ml. The best results in the production of in vitro bovine embryos were obtained with ampullary cells (280/84, 30%) in comparison with the isthmus cells (278/75, 26.9%) and the contro...

The aim of this study was to evaluate the effect of inactivated feeder cells (feeder layer system) from two segments of the bovine oviduct (isthmus and ampulla) in the in vitro development of bovine embryos. Cell lines from segments of the isthmus and ampulla were generated and subsequently inactivated with mitomycin C (40 μg/ml) to inhibit their ability to divide and eliminate competition for nutrients with embryos. Bovine oocytes were matured in vitro for 24 h and were fertilized for 18 h in conventional culture with Brangus bovine semen. The expected fertilized oocytes were cultured for seven days in the feeder layer system with isthmus and ampulla cells separately at a concentration of 1.44 x 10 5 cells/ml. The best results in the production of in vitro bovine embryos were obtained with ampullary cells (280/84, 30%) in comparison with the isthmus cells (278/75, 26.9%) and the contro...

La Leucosis bovina es causado por un virus de alta morbilidad y baja mortalidad, esta enfermedad afecta directamente al sistema inmune de los hospederos, que provoca una inmunosupresión favoreciendo la replicación de otros agentes patógenos que afectan a nivel productivo y reproductivo en los animales. El objetivo fue determinar la seroprevalencia del virus de Leucosis Bovina (BLV del ingles Bovine Leukosis virus) a través de la metodología de diagnóstico por serología (ELISA), donde se recolectaron 78 muestras de sangre a bovinos en establos lecheros de Chachapoyas y Pomacochas. Se obtuvo una seroprevalencia de 14.1%, siendo el establo de Pomacochas quien presento mayor seropositividad (11.3%), sin embargo, la presencia de la enfermedad no tiene relación directa con el sexo, edad, raza o procedencia del animal. Además, con los datos obtenidos se mantiene alerta la presencia del...

This study demonstrates the use of nuclear somatic cell transfer to produce the first cloned cattle in Peru. Skin fibroblasts and cumulus cells from adult donors were obtained for use as carioplasts; likewise, oocytes obtained from ovaries in the slaughterhouse were matured in vitro for 24 h. The mature oocytes were incubated 2 h in demecolcin (2.5 μg/ml) to promote cone formation with the metaphase plate and to guide manual enucleation. The zona pellucida in pronase (2 mg/ml) was removed for 3 min. The enucleation was manual with a microblade dividing the ova into two halves, where the nucleus-lacking halves were fused by the «sandwich» method (cytoplast–fibroblast– cytoplast). The reconstructed structures were chemically activated by incubation for 5 min in 7% absolute ethanol, followed by 5 h of cytochalacin B (5 μg/ml) and cycloheximide (10 μg/ml). The structures were cultur...

En este estudio se demuestra el uso de la transferencia nuclear de células somáticas para producir los primeros bovinos clonados en el Perú. Se obtuvieron fibroblastos de piel y células de cúmulos de donantes adultos para ser usados como carioplastos; asimismo, ovocitos obtenidos a partir de ovarios de camal fueron madurados in vitro por 24 h. Los ovocitos madurados se incubaron 2 h en demecolcina (2.5 ìg/ml) para promover la formación del cono con el plato metafásico y para orientar la enucleación manual. Se eliminó la zona pelúcida en pronasa (2 mg/ml) por 3 min. La enucleación fue manual con una microcuchilla dividiendo el óvulo en dos mitades, donde las mitades carentes de núcleo fueron fusionadas por el método «sandwich» (citoplasto–fibroblasto–citoplasto) por electrofusión. Las estructuras reconstruidas se activaron químicamente mediante incubación por 5 min...

OBJECTIVE This study aimed to report the impact of production practices and sanitary management on the prevalence of Neospora caninum (N caninum) and bluetongue virus (BTV) in Creole goats from the tropical dry forest of Utcubamba, Peru. METHODS 354 blood samples were obtained from male and female goats of diverse ages reared under an extensive productive system. The diagnosis of N caninum and BTV was conducted through a commercial ELISA kit (iD.vet) with readings taken on a Bio-Rad iMark microplate reader at 450 nm. Additionally, a survey was conducted with 18 goat producers to categorize them based on social, technical (production, health, reproduction, nutrition, and infrastructure), environmental, and economic factors. RESULTS The overall seroprevalence of N caninum and BTV in goats was 6.21% and 7.06%, respectively, Notably, group II farmers had the highest prevalence rates at 7.69%...