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Letter Production and Nutrients from Commercial Broiler Chickens

Department of Poultry Science, The Pennsylvania State University, University Park, PA 16802; Phone: (814) 865-3414; Fax: (814) 865-5691

J. H. Schwartz

Cooperative Extension, Lancaster County, The Pennsylvania State University,1383 Arcadia Road, Room 1, Lancaster, PA 17601

P. H. Patterson, E-mail:phpl{at}psu.edu

An accurate accounting of litter production and nutrient concentration of modern commercial broilers is essential for developing sound nutrient management plans. Field studies with two integrated broiler companies in Pennsylvania examined the nutrients from heavy broiler flocks grown for further processing to 57 days and 5.90 lb (2.68 kg), and medium-weight birds grownto 44 days and 4.43 lb (2.01 kg). Sample analysis indicated that, compared to published literative values, litter has a higher concentration of total-N and similar levels of P₂O₅ and K₂O. Feed consumption (8.42 and 12.47 lb/bird, or 3.82 and 5.66 kg/bird) and litter production (0.71 and 1.23 dry tons/1000 birds, or 644 and 1116kg/bird) are consistent with finding of others for medium and heavy broilers. Nutrient balance calculations considering the feed as the source of all nutrients indicated that approximately 18% of feed N is lost to the atmosphere as ammonia-N, 30 to 31% is with the litter, and the remaining 51% remains with the carcass. Approximately 35% and 21% of dietary P and K, respectively, are found in the broiler carcass during coommercial grow-out (6 to 8 wk). These results are a benchmark of current litter production and nutrient status, but they can be modified by dietary and management strategies to reduce nutrient excretions. Furthermore, regional broiler production differences and individual company management and feeding practices will undoubtedly also influence the results.

Key Words: Ammonia • broiler • litter • nitrogen • nutrient management • phosphorus • potassium

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