The aim of this study was to identify management styles in milking parlours and evaluate their impact on milk quality in dairy farms in the province of Lima. The study was conducted in 30 dairy farms in the province of Lima and at the Faculty of Veterinary Medicine of the UNMSM for 10 months, involving lactating cows in free-stall pens. Data collection included visits, surveys to dairy farm managers and workers, and analysis of milk samples. A non-experimental cross-sectional study was conducted to determine the relationship between management style in the milking parlour and milk quality. Management style was assessed through surveys covering three dimensions: tasks, people, and milking practices. Milk quality was analysed in terms of composition, hygiene, and sanitation. Statistical analysis used the two-step clustering method and a general linear model. The results of the study identi...

El objetivo del estudio fue determinar la prevalencia y frecuencia de las formas de presentación de la Leucosis Enzoótica Bovina (LEB) en establos lecheros de la provincia de Lima. Se evaluaron 354 vacas lecheras de 16 establos. Los animales fueron diagnosticados como seropositivos mediante un ELISA competitivo con muestras de suero sanguíneo. El diagnóstico de linfocitosis (alta: >7500 linfocitos/µL y muy alta: >10 000 linfocitos/µL) se realizó mediante conteo en cámara de Neubauer con muestras de sangre y la presencia de linfomegalia palpable se detectó mediante examen clínico. Los resultados mostraron una frecuencia de seropositividad de 52.3 ± 5.2%. En los animales seropositivos se encontró una frecuencia de 14.7 ± 3.7% de linfocitosis y 1.4 ± 1.2% de linfomegalia palpable. Se observó una asociación significativa entre los grupos de edad y la seropositividad (p&...

The aim of this study was to verify if rats of the Holtzman strain can be infected with the enzootic bovine leukosis virus (VLB) when they receive blood and colostrum inocula from bovines infected by the virus via orally and intraperitoneally. This is to find new species of animals that can be used in bioassays and that provide management facilities compared to the ovine species. For this, 28 rats of the Holtzman strain were used plus 8 crossbred sheep that were used as a control group. The 28 rats were distributed into three experimental groups: i) 8 rats inoculated with blood intraperitoneally, ii) 10 rats inoculated with blood orally, and iii) 10 rats inoculated with colostrum orally. The control group of sheep was inoculated with blood intraperitoneally. The inoculum was prepared from blood and colostrum samples from a cow diagnosed as serologically positive for VLB and with persiste...