Ammonia Emissions of Laying-Hen Manure as Affected by Accumulation Time

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  • Chepete Justin H.
    Department of Agricultural and Biosystems Engineering, Iowa State University, USA
  • Xin Hongwei
    Department of Agricultural and Biosystems Engineering, Iowa State University, USA
  • Li Hong
    Department of Agricultural and Biosystems Engineering, Iowa State University, USA

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A study was conducted to investigate how ammonia (NH3) emission of laying hen manure is affected by manure accumulation time (MAT). Three trials were conducted. For each trial, 108 W36 laying hens in their prime laying stage were housed in two calorimeter chambers (54 birds per chamber) that were maintained at a temperature of 24±1°C and a concomitant relative humidity of 45 to 65%. Measurements were done continuously over a 5-week period. The environmental variables measured continuously in each chamber included NH3 gas concentration, ambient temperature, dew-point temperature and air flow rate. On a daily basis, the eggs were collected, counted and weighed. The feed supplied to the birds was also weighed daily. Once a week, 18 hens per chamber were weighed. Ammonia emission rate was then calculated from the differences in NH3 concentrations between the exhaust and inlet air and the corresponding airflow rate; and it was expressed as mg·d−1·hen-1, g·d-1·AU-1 (AU=animal unit, 500kg live body weight), g·d−1·kg egg-1, and g·d-1·kg feed N intake-1. The results showed that NH3 emission progressively increased from 101±10 to 605±10mg·d−1·hen-1 when MAT increased from 1 to 5d. There was a linear relationship between NH3 emission rate and MAT and the empirical relationship has been developed for the various emission units. The NH3 emission rates measured in this study contributes to the U.S. national inventory on NH3 emissions from laying hen operations.

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