I thought I'd toss up a quick drawing of my current corral system that evolved over the past few years, just in case someone wanted ideas. Its not to scale.
With this system, two guys can easily vaccinate (3 different shots) and ivomec 30 animals/hr. If all you're doing is sorting, 2 guys can easily sort 80 - 100 animals/hr. Its also very cheap to build.
The chute is long enough to accomodate 4 adults easily, 5 if you stuff them in. I've got a sliding gate behind the squeeze, and two small man gates (not drawn) on either side, so I've got a sort of palp cage (the squeeze also has a back gate on it). As the animals come out the chute, you can easily sort them into pen 1, 2, or 5. From 5, you can sort into pen 2, 3 or 4.
Normal flow of the animals is from pen 3, through 5 and into 1 for holding. Or from 2, through 5 and into 1 for holding.
To get an idea of size, pen 1 can accomodate 50 adults, but its tight. 40 fit nicely.
There are a couple issues with this rigging. As I mentioned, the cattle will spin right at 6, versus turning left into the chute. Every now and again one of us will have to get into the tub to get them spinning left and down the chute. Occasionally an idiot will barrel out of the chute and get stuck at the right angle corner at 7, even if there are open gates. And the gate at 8, when swung open, forms a right angle corner in the alley. This is likely the most dangerous part of the system. You can easily get 6 or 7 animals "stuck" in there.
A few minor improvements would make this system much nicer:
Eliminate the right angle at 7. Increase the length of the gate at 8 so you no longer have a right angle entry into the alley, but rather a nice smooth angle for the animals to flow along. Increase the size of pen 1, and move the chute over so you have a 90 degree tub. I'd also think about getting rid of the square corners (with no gates) in pens 2 and 3.
My pen 2 is a little too big for 1 person to easily herd animals out of. I use either horse or 4 wheeler to keep them moving into Pen 5 or directly into the alley. Pen 3 is 20 feet wide, and about 200 feet long. Its perfect for one guy to push animals out of, so I try to keep the herd in there, and break off 30 or 40 animals to push into the holding pen.
When I get a chance, I'll post the new system that I'm building. Its based on a pie plate, and I think will work well for a single man.
Designing a working corral system isn't rocket science. Avoid 90 degree corners, unless you plan on putting a gate there. And don't put a gate midway down the fenceline and expect cattle to herd through it. Its not going to happen.
Rod