A Guernsey is a breed of cattle, particularly dairy cattle.

The 5 breeds of US dairy cattle are Holstien, Guernsey, Brown Swiss, Jersey, and Ayrshire. I know this because I have cows and am in 4-H.

The Guernsey is a breed of dairy cattle that originated from The Isle of Guernsey. They have a brown and white colouring and are said to be very good tempered. A Guernsey is also the name given to a traditional knitted sweater, first given to fishermen over 400 years ago. It is still produced today and is known for its durability and resistance to wear by the sea.

Ayrshire and Guernsey are dairy breeds, while Brahman is a beef breed.

None. There is no breed that gives this colour of milk. All milk from all breeds of dairy cows is white.