My only experience with pulsing chargers has been really crappy. As in my cat lays around with his tail on it and doesn't get shocked, my dog brushes against it and doesn't even notice....um yeah I'm really gonna rely on THAT thing to protect my birds. Same cat walked under my constant charger with his tail straight up, tail hit the wire, yelped like somethin else and took off like a bat outta you know where....and hasn't repeated the mistake.
I think I'll be sticking with my constant charger. Yes it kills squirrels that grab it and the grounded chainlink at the same time, but I'm ok with that.
The crappy charger was Zebra brand BTW,
I will ONLY buy FI-Shock products from now on because I've had a lot better success with them. Just my .02 on that.
Thing is, I have only used the fence for protecting my birds -- so the electricity is on the outside of their pen. No clue what it does to chickens.
However, if they simply roost on it and are not grounded they won't even be shocked -- that is how songbirds can roost on utility lines and squirrels can use them for super-highways. The rodents only get into trouble when they are touching the ground (ie another fence) and the hot wire at the same time.