Model-predicted ammonia emission from two broiler houses with different rearing systems

Abstract

Ammonia (NH 3 ) emissions from broiler production can affect human and animal health and may cause acidification and eutrophication of the surrounding environment. This study aimed to estimate ammonia emissions from broiler litter in two systems of forced ventilation, the tunnel ventilation (TV) and the dark house (DH). The experiment was carried out on eight commercial broiler houses, and the age of the birds (day, d), pH and litter temperature were recorded.Broilers were reared on built-up wood shaving litter using an average flock density of 14 bird m -².Temperature and relative humidity inside the broiler houses were recorded in the morning during the grow-out period. A factorial experimental design was adopted, with two types of houses, four replicates and two flocks with two replicates each. A deterministic model was used to predict ammonia emissions using the litter pH and temperature, and the day of grow-out. . Model-predicted ammonia emissions provided comprehensible estimations and might be used in abatement strategies for NH 3 emission.

Positioning of sensors for control of ventilation systems in broiler houses: a case study

“…Indeed, this time contains almost 67 % (40 of 60 min) of that critical hour labeled as 14h00. The use of a representative and single period can also be observed in other studies aimed at monitoring and evaluating thermal conditions in broiler rearing facilities for preliminary purposes (Curi et al, 2014;Lima et al, 2015). For the whole set of farms, the data were collected at the same height (bird heights, 0.30 m from the ground).…”

Environmental Support for Dilution of Pollutants from Broiler Production and Aquaculture in Brazil

“…The annual production is 320,000 fishes. Ammonia emission values were obtained from the application of a predicting model confirmed by measurements in loco [11]. Phosphorous release due to fish metabolism was estimated according to the conversion factor in biomass and the content of phosphorus in the food.…”

Emissões de gases de efeito estufa e amônia oriundas da criação de frangos de corte em múltiplos reúsos da cama

“…Alguns estudos buscam realizar modelos de predição na tentativa de conseguir o melhor ajuste para estimativas das emissões de NH3 pelos dejetos de frangos ao longo do ano (CARR et al, 1990;MIRAGLIOTTA et al, 2004;GATES et al, 2008;WINKEL et al, 2011;MENDES et al, 2014;LIMA et al, 2015).…”

“…Poucos são os estudos disponíveis na literatura sobre as emissões de N2O e CH4 do manejo dos dejetos de frangos na sua própria criação, muito menos informações acerca do comportamento desses gases em galpões típicos de regiões tropicais. Para a avicultura brasileira, os estudos limitam-se a avaliar a concentração de amônia (MIRAGLIOTA et al, 2004;LIMA et al, 2011;OSORIO-SARAZ et al, 2014;MENDES et al, 2014;LIMA et al, 2015) em aviários, visando o desempenho e bem-estar animal (OWADA et al, 2007). Embora a amônia não seja diretamente causadora do efeitoestufa, devido à sua alta produção na atividade avícola, seu efeito indireto deve ser considerado nos inventários.…”

“…Recentes pesquisas têm sido realizadas no Brasil sobre a emissão de NH3 em galpões de frangos (MIRAGLIOTTA et al, 2004;LIMA et al, 2011;MENDES et al, 2014;LIMA et al, 2015). No entanto, estudos sobre as emissões de GEE ainda são escassos.…”