Semiparametric Modeling of Daily Ammonia Levels in Naturally Ventilated Caged-Egg Facilities

ABSTRACT: Ammonia concentration (AMC) in poultry facilities varies depending on different environ- mental conditions and management; however, this is a relatively unexplored subject in Colombia (South America). The objective of this study was to model daily AMC variations in a naturally ventilated caged-egg facility using generalized additive models. Four sensor nodes were used to record AMC, temperature, relative humidity and wind speed on a daily basis, with 10 minute intervals for 12 weeks. The following variables were included in the model: Heat index, Wind, Hour, Location, Height of the sensor to the ground level, and Period of manure accumulation. All effects included in the model were highly significant (p<0.001). The AMC was higher during the night and early morning when the wind was not blowing (0.0 m/s) and the heat index was extreme. The average and maximum AMC were 5.94±3.83 and 31.70 ppm, respectively. Temperatures above 25°C and humidity greater than 80% increased AMC levels. In naturally ventilated caged-egg facilities the daily variations observed in AMC primarily depend on cyclic variations of the environmental conditions and are also affected by litter handling (i.e., removal of the bedding material).

• Autores: Gutiérrez Zapata, Diana María; Cerón Muñoz, Mario Fernando; Galeano Vasco, Luis Fernando
• Tipo de recurso: Article of investigation
• Fecha de publicación: 2016
• Institución: Universidad de Antioquia
• Repositorio: Repositorio UdeA
• Idioma: eng
• OAI Identifier: oai:bibliotecadigital.udea.edu.co:10495/32698
• Acceso en línea: https://hdl.handle.net/10495/32698
• Palabra clave: Contaminación del Aire Interior; Air Pollution, Indoor; Amoníaco; Ammonia; Bienestar del Animal; Animal Welfare; Pollos; Chickens; Vivienda para Animales; Housing, Animal; Oviposición; Oviposition; Ventilación; Ventilation
• Rights: openAccess
• License: http://creativecommons.org/licenses/by/2.5/co/