Submitted to: Southern Poultry Science Society Meeting Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 1/20/2003
Publication Date: N/A
Citation: Interpretive Summary:
Technical Abstract: The focus of this research was to determine the effect of supplemental dietary methionine sources on volatile compounds in broiler excreta. Three trials were conducted utilizing straight run broilers in battery cages. All excreta were collected in litter pans lined with aluminum foil. Each trial consisted of 5 treatment groups with 3 replications of 13 randomly distributed broiler chicks per pen. Treatment groups consisted of no supplemental methionine (control group), sodium methioninate aqueous solution, dry methionine hydroxy analogue, liquid methionine hydroxy analogue, and dl-methionine. The methionine activity of each methionine source was 45.9, 52, 88, and 98% respectively. In trials 1 and 2, starter and grower diets were formulated to contain 0.8% total methionine activity (except control group, 0.35% total methionine activity). In trial 3, starter and grower diets were formulated to contain 0.5% and 0.38% total methionine activity, respectively. Trial 3 control levels of methionine were as in earlier trials. There were no significant differences in body weight, feed consumption or feed conversion among the treatments in any trial. Odor volatiles were evaluated in all trials by an electronic nose (EN) (Cyranose 320, Cyranose Sci., Inc., Pasadena, CA), gas chromatography, mass spectrophotometry (GC/MS) in trial 2 and olfactory sensory panel (OSP) in trial 3. EN evaluation indicated significant differences in odor compounds in broiler excreta among the treatments. GC/MS revealed significant differences in odor compound concentrations among the treatments, with control levels consistently lower than other treatments. OSP evaluation indicated that the detection threshold of control samples was significantly higher than that of other treatment groups. These findings demonstrate that supplemental dietary methionine sources significantly influence odor volatile concentrations in broiler excreta and that even small levels of supplemental methionine have a significant impact on concentration of odor compounds and odor intensity.