I also recommend Eco-Logical and Climate Concerns, since the climate is changing so drastically. As a dairy farmer, you're lucky to live in Washington. Many in other states are having a hard time. Though climate change will impact the price of feed everywhere.
After you've searched for topics of interest in "Groups" above and in the "Forums", don't forget to look at recent activity which hides along the right margin of the page all the way at the bottom.