Milk production is concentrated in the Saint Joachim Valley .
Ranked first place in milk production in the United States, California state is characterized by the intensive and extremely technical dairy business. The black and white Dutch breed prevails among others. Jersey breed has been growing a lot since it offers breeders the possibility of making greater profits due to the fact the milk from this breed contains more fat and protein. This trend occurs not only in California but throughout the country. The terrain is characterized by a large plain area surrounded by mountains.