Table 3. Participation of Dairy Cows in DHI Mastitis Screening
as of January 1, 2007 By State

State Herds Cows Percentage of DHI cows
Alabama 29 4,931 83
Arizona 33 69,278 93
Arkansas 38 5,640 99
California 912 929,395 95
Colorado 41 34,863 84
Connecticut 78 10,129 90
Delaware 26 3,550 95
Florida 16 16,829 33
Georgia 114 21,500 54
Idaho 180 177,900 97
Illinois 462 50,579 99
Indiana 386 49,172 98
Iowa 933 119,157 99
Kansas 210 24,619 71
Kentucky 198 21,395 96
Louisiana 57 7,933 79
Maine 111 11,041 86
Maryland 343 35,989 99
Massachusetts 79 7,951 92
Michigan 737 146,323 93
Minnesota 2,384 251,332 99
Mississippi 37 7,317 95
Missouri 363 35,909 98
Montana 40 6,277 81
Nebraska 158 30,029 99
Nevada 14 9,192 100
New Hampshire 82 9,007 98
New Jersey 57 4,993 100
New Mexico 27 61,313 94
New York 1,935 287,062 89
North Carolina 157 26,795 91
North Dakota 43 5,327 82
Ohio 829 111,877 97
Oklahoma 76 13,618 95
Oregon 231 53,881 99
Pennsylvania 4,245 321,444 94
Puerto Rico 114 27,067 86
Rhode Island 4 342 100
South Carolina 53 10,370 82
South Dakota 148 27,717 98
Tennessee 166 21,827 92
Texas 167 88,804 86
Utah 155 46,138 99
Vermont 354 47,493 88
Virginia 391 58,276 95
Washington 198 66,472 98
West Virginia 42 4,574 98
Wisconsin 5,448 585,860 98
Wyoming 5 893 100
United States 22,906 3,969,380 94 

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