Have it so when you set your pasture type, have it be something like:
Poyo(meat)
Poyo(eggs)
Sheep(meat)
Sheep(wool)
Rabbit(meat)
When selected, the shepperd will act accordingly, the pastures where poyo(meat) is set, he will slaughter the poyos there fairly regularly, while if poyo(egg) is selected, he will only kill them if directly commanded too. This way we can have a regular supply of meat, but still retain some control over how our farm/ranch is handled.