Effects of dietary supplemental methionine sources on odor volatiles in broiler excreta.

摘要

An investigation was conducted to evaluate the impact of supplemental dietary Met sources on volatile odor compounds in broiler excreta. In all trials chicks were randomly distributed into three replications of five treatment groups with 16 birds per pen. The treatment groups were dry Met hydroxy analogue, sodium methioninate aqueous solution, liquid Met hydroxy analogue, D, L-Met, and no supplemental Met. All excreta for all trials were collected in litter pans lined with aluminum foil. In trial one and two, a Cyranose 320 electronic nose was used to capture three to four air samples from various locations for each pan of broiler excreta resulting in a total of ten air samples from each treatment group. Results from both trials (1 and 2) indicated that there were significant differences in volatiles in the broiler excreta for all treatment groups.; In trial three, broiler excreta were analyzed by gas chromatography/mass spectrometry. Volatile sulfur compounds that were identified and quantified in the broiler excreta were: hydrogen sulfide, carbonyl sulfide, methyl mercaptan, dimethyl disulfide, and dimethyl trisulfide. There were statistical differences in five volatile sulfur compounds for each of the treatment groups.; In trial four, the electronic nose was used to evaluate 15 air samples per treatment group. Also, 15 air samples were collected for odor evaluation by a sensory panel. Electronic nose sensor data and odor evaluation indicated that the volatile compounds concentration in broiler excreta of the control group were significantly different from the other treatment groups.; In trial five and six broiler excreta were collected for analysis by a trained sensory panel. The fourteen odor attributes utilized to determine differences in broiler excreta by the trained sensory panel were ammonia, dirty socks, wet poultry, fermented, fermented (rotten) fruit, hay, musty wet, sharp, sour fermented, urinous, rotten eggs, irritating, pungent, and nauseating. Panelist marked intensities for each attribute ranging from 0 = none and 15 = extremely intense. For both trial five and six there were statistical differences between the attributes for all the treatment groups. These findings demonstrated that supplemental Met sources significantly influences odor related compounds in broiler excreta.