Reprinted, with permission, from the proceedings of: Mitigating Air Emissions From Animal Feeding Operations Conference.
Managing floor-raised poultry offers options for providing a suitable environment for the bird productivity and an opportunity to reduce environmental pollution. Reduction of aerial ammonia (NH3) concentration within the poultry house will benefit bird health for improved production and reduce emissions from the building. Three management options are discussed: 1. new bedding every flock; 2. built-up litter; 3. built-up litter with acidifying product.
Indoor ammonia level and emissions are most improved with use of new litter every flock. Adoption of this practice is very limited in the USA. Built-up litter is most common in the USA. Acidifying treatments are applied to built-up litter in an attempt to reduce litter pH below 7 to overcome the substantial ammonia volatilization
Acid treatments have offered variable results under field conditions in reducing in-house aerial ammonia levels and associated emissions. Variable results are due, in part, to reduced ventilation rates to lower supplemental heat expenditures after application of acid treatment. Reduced ventilation fresh air exchange results in increased house humidity and ammonia concentration within the building. Attention to litter pH and aerial humidity after application of acid-treatment should improve results for more consistent aerial environment improvement.
Labor cost of implementing new litter every flock is close to the labor (16 hours) for managing built-up litter. Cost of new bedding material every flock may be equal to, but usually greater than acid treatment between flocks. New litter benefit reported here does not account for the savings from reduced energy use during the brooding period (lower ventilation rates possible) and increased bird placement numbers with the improved environment versus flocks raised on acid-treated built-up litter.
Eileen Wheeler1, Kenneth Casey2, Richard Gates3, Hongwei Xin4, Yi Liang5, Patrick Topper1
1Pennsylvania State University, 2 Texas AgriLife Research, Texas A&M System, 3University of Kentucky, 4Iowa State University, 5University of Arkansas
Point of Contact:
Eileen Fabian Wheeler, email@example.com
The information provided here was developed for the conference Mitigating Air Emissions From Animal Feeding Operations Conference held in May 2008. To obtain updates, readers are encouraged to contact the author.