I want to make command blocks that executes "say Zero pigs alive" when the amount of pigs on the map is zero. I made a pig count with a scoreboard on the side that shows the amount of pigs when I press on the button, but I want a command to be executed when the amount is zero on the scoreboard. Does anyone know how I can do this?

This is what is looks like, when the 16 is a zero, so no pigs are in the map, it needs to activate the next command block that says "Zero pigs alive"