Table 11.
Life cycle impact assessment results for acidifying emissions, eutrophying emissions, greenhouse gas (GHG) emissions, and cumulative energy demand (CED) per metric ton of pullet and layer feeds produced in the United States in 1960 and 20101
| Feed and year | Acidifying emissions (kg of SO2-e) | Eutrophying emissions (kg of PO4-e) | GHG emissions (kg of CO2-e) | CED (MJ) |
|---|---|---|---|---|
| Pullet feed 1960 | 18.4 | 6.8 | 1,015 | 3,139 |
| Pullet feed 2010 | 9.8 | 2.9 | 584 | 4,267 |
| Reduction (%) | 47 | 57 | 42 | −36 |
| Layer feed 1960 | 34.5 | 13.8 | 1,860 | 4,560 |
| Layer feed 2010 | 12.5 | 4.4 | 782 | 4,632 |
| Reduction (%) | 64 | 68 | 58 | −1.6 |
1e = equivalents.