What does it mean for a livestock animal to be "sound" ?

it means that the the livestock animal is healthy

If a livestock animal is "sound" it could mean that the animals are safe.

Like how people say "they are safe and sound". It could mean the same thing.

the roman republic began to expand when rome fought the punic wars and defeated carthage. the punic wars refer to the series of 3 wars fought among rome and carthage, before it ended in carthage's defeat.