Why isn't my pasture working in Banished?

All livestock on banished needs to be bought. You will have to build a trading post and buy some members of the species you want to start the Pasture.

Costs:

• Cattle: 800 from random merchants, and 1000 when custom ordered.
• Sheep: 600 from random merchants, and 750 when custom ordered.
• Chicken: 400 from random merchants, and 500 when custom ordered.

Other aspect that you have to take care while building pastures is it's minimum size. All the 3 livestock have a minimum size required, and they will not reproduce if the size of your pasture is not enough.

Taking a look at the Shinning Rock forums, you can find information that the message Work disabled at this location basically means:

• Not enough workers to be assigned as herders or not workers assigned at all;
• No animals purchased to start the pasture production;
• No animal selected on that pasture;

More reading:

• Livestock - Banished Wiki
• Pastire - Banished Wiki