Mitigation of ammonia emissions from pig production using reduced dietary crude protein with amino acid supplementation. (June 2017) - Liu, Shule
Highlights: Mitigating ammonia from a 720-pig research building was studied for 155 days. Two crude protein (CP) reduced diets were compared with standard diet for the pigs. Two groups of pigs fed with CP-reduced diets emitted 33% and 57% less ammonia. Manure volumes and NH4 + -N in manure decreased as the CP reduced in the feed. Peak emissions occurred earlier in growth stages for the treated than the control. Abstract: 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 (T1 ), 4.4–7.8% reduced CP (T2 ), and standard (control) diets, respectively. Compared with the control group, T1 and T2 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 T1 (46.7 g d −1 AU −1 ) and T2 (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 T1 and T2, but delayed to the first grower phase for the control group.