Communication Dans Un Congrès Année : 2009

Ammonia Emissions of Pullets and Effects of Stocking Density

Résumé

Data on ammonia (NH3) emissions from pullets (hens <18 weeks of age) are non-existent, despite the large differences in nutritional and environmental conditions between raising pullets and laying hens. Different stocking densities (SD's) in housing the birds may be used in response to certain industry guidelines on production. Bird SD affects the amount of manure per unit of storage or surface area as manure accumulates, and the exposed manure surface area may affect ammonia emission from the accumulated manure. The objectives of the study were to determine NH3 emission rate (ER) of pullets during the growth period (4-18 weeks of age), and to assess the effect of SD on NH3 ER of pullets and laying hens during a 6-d manure accumulation period. Two different SD's at a given bird age were evaluated, ranging from 155 to 619 cm 2 (24 to 96 in 2 ) per bird. As of this writing, tests had been conducted for W-36 pullets at 4 to 14 weeks of age. Ammonia ER was expressed in the units of amount of NH3 emission per bird, per kg of feed nitrogen (N) intake, and per kg of as-is manure weight. Data to date showed that there was no significant SD effect on NH3 ER in mg/pullet or mg/kg N intake (p = 0.06 -0.46); however, SD significantly affected NH3 ER in mg/kg manure (p = 0.0001 -0.03). The study also suggests that NH3 ER increases, in an exponential fashion, with pullet age and manure accumulation time. Results from this study will provide lab-scale data on NH3 emissions of pullets and how SD may affect the emission magnitude. The data will help set a foundation for further field-scale emissions measurement, and ultimately development of best management practices to effectively reduce aerial emissions from egg production operations.

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hal-05272006 , version 1 (22-09-2025)

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  • HAL Id : hal-05272006 , version 1

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Luciano Barreto-Mendes, Hongwei Xin, Hong Li. Ammonia Emissions of Pullets and Effects of Stocking Density. 2009 ASABE Annual International Meeting, ASABE, Jun 2009, Reno, United States. ⟨hal-05272006⟩
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