agg spreads?

ive been reading a lot about spread trading on here

so i'm researching the aggricultural products at the moment

which ones could be traded in a similar fashion to the oils products (like brent and wti) via calender spreads

thanks

beans, wheat, corn, meal, bean oil, hogs, feeder and live cattle.
in beans, november is new product month
in wheat, july is new product month
in corn december is new product month (however september corn is cross between new and old product)

old/new product AG calendars is very volatile
you can also trade corn/wheat as an exchange traded spread (intra or inter commodity it is called)