Ante la creciente producción de residuos a todos los niveles se ha considerado la posible utilización de estos como materia prima. Esta investigación persigue la valorización de residuos sólidos orgánicos como sustrato para el crecimiento de Bacillus thuringiensis (Bt) utilizando la Fermentación en Estado Sólido (FES). El Bt es una bacteria empleada como agente de control biológico para el control selectivo de insectos plaga. El objetivo principal del trabajo ha sido determinar la factibilidad de utilizar residuos orgánicos sin pre-tratamiento a una escala piloto. Se trabajó en 4 fases principales: en la primera fase se utilizó residuo de procesado de soja a escala laboratorio y en reactores de 10 L mediante FES; en la segunda fase se utilizó la Fracción Orgánica de Residuos Municipales de recogida selectiva (FORM) esterilizada y sin esterilizar, mediante fermentación sum...

The study was carried out to identify the causes and factors associated with neonatal lamb mortality in Creole sheep flocks in extensive rearing system. Three farms located in the grasslands of the peasant community of Quero, province of Jauja, Peru, located at altitudes between 3972 and 4430 m were selected. Flocks were visited once every two weeks to collect information on mortality. The neonatal mortality rate at the end of the lambing season was 21.2%. The causes of mortality were in order of frequency: pneumonia, starvation, dystocia, diarrhoea and predation. The highest mortality rate occurred within 48 hours of parturition (71.4%). Lambs born to ewes with a body condition score (BCS) <2 were more likely to die than those born to ewes with better BCS (OR = 7.42). Moreover, lambs with >2 kg birth weight (OR = 3.52) and those born in farm C (OR = 3.42) were three times more lik...