Table 3. Participation of dairy cows in DHI mastitis screening as of January 1, 2009, by State

State Herds Cows Percentage of DHI cows
Alabama 19 3,772 100
Arizona 30 62,910 93
Arkansas 29 4,539 99
California 885 988,432 97
Colorado 41 43,474 91
Connecticut 78 9,875 93
Delaware 30 3,213 85
Florida 16 17,093 35
Georgia 103 23,558 57
Idaho 169 204,359 96
Illinois 424 50,235 100
Indiana 362 50,621 99
Iowa 839 132,010 99
Kansas 185 23,850 98
Kentucky 201 23,116 94
Louisiana 49 7,636 81
Maine 121 12,648 85
Maryland 314 35,285 98
Massachusetts 81 7,414 93
Michigan 672 154,459 86
Minnesota 2,210 256,041 99
Mississippi 34 7,002 100
Missouri 337 37,845 100
Montana 31 6,296 94
Nebraska 136 27,803 95
Nevada 14 9,375 100
New Hampshire 85 9,771 98
New Jersey 53 4,569 88
New Mexico 28 72,561 91
New York 1,885 310,815 92
North Carolina 137 24,850 92
North Dakota 39 6,325 85
Ohio 804 124,809 98
Oklahoma 67 11,242 96
Oregon 196 50,453 100
Pennsylvania 4,177 330,511 94
Puerto Rico 55 13,098 54
Rhode Island 7 515 99
South Carolina 50 9,959 87
South Dakota 131 37,919 96
Tennessee 141 18,365 87
Texas 149 95,888 82
Utah 127 44,388 100
Vermont 352 48,795 91
Virginia 369 58,341 94
Washington 190 73,768 100
West Virginia 42 4,892 100
Wisconsin 5,126 636,534 99
Wyoming 2 685 100
United States 21,622 4,191,914 94 

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