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COMPARISON OF TWO METHODS FOR ESTIMATING BROILER MANURE NUTRIENT EXCRETION: BIOLOGICAL MASS BALANCE VERSUS MODEL BASED ON MASS BALANCE APPROACH
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.orgCitation: Pp. 303-309 in the Ninth International Animal, Agricultural and Food Processing Wastes Proceedings of the 12-15 October 2003 Symposium (Research Triangle Park, North Carolina USA), Publication Date 12 October 2003. 701P1203.(doi:10.13031/2013.15265)
Authors: R. Angel, T.J. Applegate, and S. Bastyr
Keywords: Broiler chickens, mass balance, excreta, nitrogen, dry matter, phosphorus
In the absence of actual biological data on total excreted nutrients, development of models is needed to predict these values. Models are usually constructed based on relationships that have been determined biologically and that allow for estimation of values. Estimation of nutrient excretion has become necessary due to the recent emphasis on environmental management and regulation of animal feeding operations. Because of the impact that new environmental regulations will have on animal production it is important to determine if model estimates are accurately predicting biological nutrient excretion rates. A broiler chick total excreta collection by age period trial was conducted to determine actual excretion of dry matter (DM), nitrogen (N) and phosphorus (P). Values obtained in this trial were compared to the latest broiler model developed and proposed by the American Society of Agricultural Engineers (ASAE). The new proposed ASAE model overestimates DM, N and P excretion by 19.4, 14 and 13%, respectively as compared to numbers obtained from a total collection trial in broiler chicks up to 2.36 kg of body weight fed an average industry diet. The apparent overestimation in nutrient excretion levels in the proposed ASAE model reflects variability inherent at the commercial production level. These overestimations are within what would be expected when average production levels (variable) are being used compared to levels obtained from one controlled battery trial.(Download PDF) (Export to EndNotes)