Table 3. Participation of Dairy Cows in DHI Mastitis Screening
as of January 1, 2008 By State

State Herds Cows Percentage of DHI cows
Alabama 26 4,917 89
Arizona 33 70,975 90
Arkansas 32 5,041 100
California 893 970,255 96
Colorado 42 43,674 87
Connecticut 79 10,994 93
Delaware 30 3,856 100
Florida 17 22,684 42
Georgia 114 24,184 61
Idaho 174 210,195 99
Illinois 444 50,260 100
Indiana 367 50,847 97
Iowa 881 122,750 98
Kansas 197 30,778 95
Kentucky 201 22,668 91
Louisiana 49 7,436 78
Maine 116 11,487 86
Maryland 321 35,168 99
Massachusetts 82 7,935 92
Michigan 715 159,832 93
Minnesota 2,297 256,111 99
Mississippi 36 7,785 99
Missouri 339 36,210 98
Montana 34 6,300 94
Nebraska 146 28,611 99
Nevada 15 11,392 100
New Hampshire 85 9,763 99
New Jersey 55 4,898 95
New Mexico 25 62,826 91
New York 1,928 304,527 92
North Carolina 147 27,093 91
North Dakota 42 6,000 81
Ohio 810 114,975 97
Oklahoma 67 10,556 91
Oregon 214 50,337 97
Pennsylvania 4,207 331,810 95
Puerto Rico 44 11,066 40
Rhode Island 4 392 100
South Carolina 54 11,667 90
South Dakota 140 33,126 99
Tennessee 165 20,896 94
Texas 161 103,045 90
Utah 143 44,837 92
Vermont 356 48,853 92
Virginia 375 56,191 92
Washington 201 73,268 98
West Virginia 39 4,437 97
Wisconsin 5,374 618,328 98
Wyoming 2 637 100
United States 22,318 4,161,873 94 

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