In the 1920s the term cosmic rays was coined by Robert Millikan who made measurements of ionization due to cosmic rays from deep under water to high altitudes and around the globe. Millikan believed that his measurements proved that the primary cosmic rays were gamma rays, i.e., energetic photons.
A proper balance of grass and non-fibrous carbohydrates in the diet should increase intake and maximize milk production. In summary, high quality perennial grasses can fit well in the rations of high producing dairy cows. Figure: Impact of corn grain price on economic return for diets varying in forage to concentrate ratio.
And even though there are a large number of cattle breeds, there are only a few breeds that specialize in milk production. Dairy cattle are those breeds that produce larger volumes of milk for a longer period of time than other cows. In the United States today, there are 6 main breeds of Dairy cattle. The most common dairy breeds are Holstein, Jersey, Brown Swiss, Guernsey, Ayrshire, and Milking Shorthorn. A farmer- depending on his unique situation or geographic location- may choose cattle breeds with different characteristics for his herd.