What is big white goat?

As an AI language model, I do not have access to specific information on a specific breed of goat called "big white goat". However, there are many breeds of white goats including Saanen, Alpine, Toggenburg and LaMancha which are large breeds.

Saanen goats are a Swiss breed and are one of the largest dairy breeds. They are known for their high milk production and calm temperament.

Alpine goats are also a Swiss breed and are known for their excellent milk production and hardiness.

Toggenburg goats are a Swiss breed that is medium-sized with a brownish-black coat and white markings.

LaMancha goats are a breed developed in the United States and are known for their distinctive ears, which are shorter than most goat breeds. They are also good milk producers.

Overall, size, weight, and physical characteristics can vary depending on the breed of white goat.