Normally when you harvest corn you just harvest the corn: the cobs, husks, and stalks are thrown out the back of the combine. Earlage you harvest the corn, husk, and cob (we use for cattle feed). Silage you harvest the majority of the plant: corn, cob, husk, and stalk (for feed, also).
The decision to feed earlage for our cattle is basically for the ration we feed to the cattle. Earlage has more roughage than straight corn, but less roughage than silage. So, if we feed corn we'd need to add more roughage (like hay), and if we feed silage we'd need to feed more corn to balance out the ration needed. Earlage is an in-between and works for our rations and feed options.
Here are some of the "highlights" from the day as taken through Snapchat. I didn't get the end of the day because I ran out of battery!