I always used "Bok Bok" for my hens, but BH uses "Chook chook", so now ours are bilingual!

My fleece sheep know "Come oooooo-ooon sheep" - that's if they aren't already at the gate having heard the door squeak where I keep their feed.
The Jerseys each know their own name, and also understand, "
Just Hillie" (Plenty stays back, etc).
The pigs have usually cottoned on by the time I get to them, but if not it's "PigPigPigPigPigPig PIIIIIG!!" And "Meeee-eeee----e-eeegPig!"
In truth if any of my lot hears any of the above, they know I'm about and will get to them soon, so they start to call each other - and me - and congregate.
My sheep can detect an empty bucket at 20 paces

. But generally, as long as there is actual cake in the bucket, they'll follow me to wherever I want them. It's a big help to have someone in hiding waiting to close the final gate, though - several times I've lost them at the last moment, as the wily ones (usually the Manxes) realise I am about to pen them up as I turn back for the gate!