When calculating the CO
2
eq emissions, because
N
2
O and CH
4
emissions are low from swine housing,
CO
2
was the most dominant GHGs, accounting for
>90% of total CO
2
eq. Given the feeding strategy employed in this study (reduced diet CP), coupled with
low emissions of N
2
O and CH
4
from housing, it is not
unexpected that no differences in CO
2
eq emissions
were observed in the housing system. The potential
for diet effects on CO
2
eq emissions lies in the manure
management part of the livestock system, particularly
N
2
O emissions that result following land application
of manures containing different N content. In this
study, the manure N content did not differ as a result
of dietary treatments fed to the pigs suggesting that
no difference in a feed-through-field CO
2
eq balance
would be observed.