AbstractSince the introduction of dairy breeds of cattle in Puerto Rico in 1911, a great improvement has been seen in the dairy industry. Especially has there been an increase in milk production per cow. Prom 1920 to 1935, the average increase in milk production per cow was 27 per cent and the increase in the number of cows milked about 23 per cent. The average milk production per cow in 1935 was 1.657 pounds of milk. The most important kinds of pasture grasses in the Island are Guinea grass and Para grass. Of minor importance are Guatemala, Elephant, and Molasses grass. In 1929, there were 21,980 acres of the first two mentioned, and 6,713 acres of the last mentioned in addition to other grasses. Neither hay nor silage is fed to cows.
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