Corrals are where livestock are raised to produce a number of very important base goods. Each corral can only raise one type of animal at a time and so like the field, it can pay to have multiple.
Don't let rodents eat your supplies and scare your animals.
A dog will guard your animals from fox attacks.
Build a chicken coop in your corral to provide eggs.
Comfortable Working Conditions
Invest in a nicer working environment for your workers. Adding more workers to a single production will become much more efficient.