Result 2: the more integrated farms are more often more environmentally-friend...but we can observe a large variability
In the following figure, we can see than 3 types of farming systems contribute more than the average to farms having the lower environmental impacts (e+ and E+):
SGF (specialized dairy farms with grasslands),
SIF (dairy farms with cash crops and middle quantity of home-grown feed),
FIF (dairy farms with cash crops and high quantity of home-grown feed)