The objective of this research was to evaluate the optimum density in the rearing of guinea pigs of the Peru breed in the growth phase, under humid tropical conditions. We used 200 guinea pigs (100 males and 100 females) weaned from the Peru breed at 30 days of age, distributed in a DBCA with 5 treatments (density = 8, 9, 10, 11 and 12 animals/0.96m2) and 4 replications, being sex the blocking effect, the significant difference between treatments was performed with Duncan's test (5%), in addition, the linear regression test was performed to determine the optimum density. In the zootechnical parameters, significant differences were observed (P<0.05); obtaining for weight gain, feed consumption and feed conversion the best result was evidenced in treatment T5 (D12) with 9.05g, 54.11g, 6.03 respectively. It was concluded that the best density for raising guinea pigs of the Peru breed in ...

El estudio tuvo como objetivo evaluar la contaminación del aire por partículas sedimentables en domicilios en la zona urbana de la Provincia de Leoncio Prado, Departamento de Huánuco. El tipo de estudio fue transversal y de nivel descriptivo, la muestra estuvo conformada por 12 zonas de monitoreo. Para el diseño del soporte de placas receptoras, la recolección de muestras y cálculos de la concentración de partículas sedimentables se utilizó los procedimientos del Boletín Oficial del Estado de 1976. Los resultados indican que para la zona de la Av. Amazonas fue de 0.372 mg/cm2/mes, Jr. Julio Burga 0.384 mg/cm2/mes, Av. Raymondi 0.430 mg/cm2/mes, Naranjillo Centro 0.478 mg/cm2/mes, Electrocentro 0.633 mg/cm2/mes, Naranjillo Entrada 0.705 mg/cm2/mes, Afilador 0.722 mg/cm2/mes, Av. Raymondi 0.955 mg/cm2/mes, Brisas del Huallaga 0.966 mg/cm2/mes, Castillo Grande Entrada 0.989 mg/cm2...