To mitigate ammonia (NH3) emissions from pig production and understand dynamic emission profiles, reduced dietary crude protein (CP) with amino acid supplementation was studied with 720 pigs in a 12-room research building for 155 days that covered from weaned to finishing stages. The pigs were divided into three 4-room groups and fed with 2.1-3.8% reduced CP (T-1), 4.4-7.8% reduced CP (T-2), and standard (control) diets, respectively. Compared with the control group, T-1 and T-2 decreased manure volumes and manure NH4+-N concentrations. Group-mean NH3 emission from the control group was 68.9 g d(1) AU (1) (AU = 500 kg live mass). Emissions from T-1 (46.7 g d (1) AU(1)) and T-2 (29.8 g d (1) AU(1)) were reduced by 33.0% and 57.2% (p < 0.05), respectively. Dynamic peak NH3 emissions appeared during the third nursery phase for T-1 and T-2, but delayed to the first grower phase for the control group. (C) 2017 Elsevier Ltd. All rights reserved.