Highlights Draft EPA emission models for laying hen facilities were systematically evaluated. The performed poorly on predicting the air pollutants when input variables out of NAEMS data range. A key finding was unanticipated sensitivity draft model outputs to bird inventory and climate zones. Further revision improvement may be necessary before they can adopted by egg industry. Abstract. In Au...

Egg production data used in this work were obtained from records of Fayoumi chickens flock belongs to El-Takamoly poultry project at Al-Azab, Fayoum Governorate. over a 52-wk egg laying period related 1900 hens. All was summarized on weekly basis as eggs per hen week hen-day (survivor) basis. Regarding Wood and McNally models, (a) stands for initial production, parameter value very low (0.001) ...