The objective of this study was to determine
the effects of specific crystalline AA supplementation
to a diet on odor emission, odor intensity, odor
hedonic tone, and ammonia emission from pig manure,
and on manure characteristics (pH; ammonia N; total
nitrogen; sulfurous, indolic, and phenolic compounds;
and VFA concentrations). An experiment was conducted
with growing pigs (n = 18) in a randomized
complete block design, with 3 treatments in 6 blocks.
Treatment groups were (1) a 15%-CP basal diet with 3
times the requirement of sulfur-containing AA (14.2 g/
kg of diet, as-fed basis); (2) the basal diet with 2 times
the requirement of Trp and Phe+Tyr (2.9 and 20.4 g/
kg of diet, respectively, as-fed basis); and (3) the basal
diet with AA supplementation to levels sufficient for
maximum protein gain. Pigs with an initial BW of 41.2
± 0.8 kg were individually penned in partly slatted floor
pens and offered a daily feed allowance of 2.8 times the
maintenance requirement for NE (293 kJ/kg of BW0.75).