Produced in Spanish this series contains 20 lessons on the intermediate level for teachers to use in foreign language science study. Jersey Cows are famous for the high butterfat content of their milk. This breed is small, and this breed was originally developed on the Channel Islands off the northwest coast of France. The average female weighs about 1,100 pounds, and the average male weighs about 1,650 pounds. This unique breed of cattle has been carefully protected from outside influence.