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Manipulation of Dietary Protein and Nonstarch Polysaccharide to Control Swine Manure Emissions
Author(s) -
Clark O. Grant,
Moehn Soenke,
Edeogu Ike,
Price Jason,
Leonard Jeremy
Publication year - 2005
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq2004.0434
Subject(s) - manure , odor , beet pulp , chemistry , xylanase , food science , nitrous oxide , zoology , factorial experiment , pulp (tooth) , manure management , nitrogen , agronomy , biology , biochemistry , enzyme , medicine , organic chemistry , pathology , statistics , mathematics
Odor and greenhouse gas (GHG) emissions from stored pig ( Sus scrofa ) manure were monitored for response to changes in the crude protein level (168 or 139 g kg −1 , as‐fed basis) and nonstarch polysaccharide (NSP) content [i.e., control, or modified with beet pulp ( Beta vulgaris L.), cornstarch, or xylanase] of diets fed to pigs in a production setting. Each diet was fed to one of eight pens of pigs according to a 2 × 4, full‐factorial design, replicated over three time blocks with different groups of animals and random assignment of diets. Manure from each treatment was characterized and stored in a separate, ventilated, 200‐L vessel. Repeated measurements of odor, carbon dioxide (CO 2 ), methane (CH 4 ), and nitrous oxide (N 2 O) emissions from the vessels were taken every two weeks for eight weeks. Manure from high‐protein diets had higher sulfur concentration and pH ( P ≤ 0.05). High‐NSP (beet pulp) diets resulted in lower manure nitrogen and ammonia concentrations and pH ( P ≤ 0.05). Odor level and hedonic tone of exhaust air from the storage vessel headspaces were unaffected by the dietary treatments. Mean CO 2 and CH 4 emissions (1400 and 42 g d −1 m −3 manure, respectively) increased with lower dietary protein ( P ≤ 0.05). The addition of xylanase to high‐protein diets caused a decrease in manure CO 2 emissions, but an increase when added to low‐protein diets ( P ≤ 0.05). Nitrous oxide emissions were negligible. Contrary to other studies, these results do not support the use of dietary protein reduction to reduce emissions from stored swine manure.

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