DHI Participation as of January 1, 2021
DHI Report K-1

DHI Participation 2020  
Table 1. Dairy cow enrollment in DHI as of January 1, 2021, by test plan

Plan code Plan tag Herds Cows Percentage of DHI cows
00 DHI 226 110,106 2.7
02 DHI-APCS 655 962,789 23.6
20 DHIR 215 50,035 1.2
22 DHIR-APCS 218 166,992 4.1
23 DHIR-AP 1,598 332,855 8.2
31 DHI-AP 5,276 1,958,733 48.0
33 DHI-MO 12 14,961 0.4
34 DHI-MO-AP 10 7,350 0.2
40 DHI-OS 338 31,419 0.8
41 DHI-OS-AP 2,440 209,668 5.1
42 DHI-OS-APCS 192 35,679 0.9
43 DHI-OS-MO 20 7,766 0.2
44 DHI-OS-MO-AP 7 2,009 0.0
45 DHI-OS-AC 3 2,344 0.1
70 DHI-SS 11 4,788 0.1
71 DHI-SS-AP 415 132,468 3.2
72 DHI-SS-APCS 46 39,100 1.0
73 DHI-SS-MO 3 4,155 0.1
74 DHI-SS-MO-AP 6 4,038 0.1
  All Plans 11,691 4,077,255 100.0 

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DHI Participation 2020  
Table 2. Participation of dairy cows in DHI mastitis screening as of January 1, 2021, by State

State Herds Cows Percentage of DHI cows
Alabama 5 770 100
Arizona 9 36,793 100
Arkansas 11 1,724 93
California 552 891,844 100
Colorado 28 41,281 99
Connecticut 44 9,324 96
Delaware 13 2,629 100
Florida 13 20,891 72
Georgia 36 15,012 91
Idaho 93 217,369 100
Illinois 223 40,916 100
Indiana 195 33,265 55
Iowa 390 113,377 99
Kansas 93 22,946 78
Kentucky 180 24,032 98
Louisiana 20 3,408 100
Maine 77 12,236 89
Maryland 183 28,085 100
Massachusetts 54 4,042 93
Michigan 368 155,829 81
Minnesota 976 202,315 100
Mississippi 19 3,905 100
Missouri 163 19,273 100
Montana 13 2,248 74
Nebraska 45 26,346 95
Nevada 8 11,404 94
New Hampshire 59 7,329 94
New Jersey 31 3,039 100
New Mexico 13 64,337 100
New York 1,058 335,588 96
North Carolina 73 22,798 95
North Dakota 15 6,683 82
Ohio 487 91,476 91
Oklahoma 37 5,110 100
Oregon 86 37,365 99
Pennsylvania 2,683 283,416 97
Rhode Island 4 214 100
South Carolina 18 4,698 100
South Dakota 50 42,825 100
Tennessee 45 6,287 90
Texas 72 220,404 95
Utah 70 27,047 75
Vermont 212 45,657 97
Virginia 178 38,944 95
Washington 67 67,646 96
West Virginia 12 1,142 100
Wisconsin 2,426 660,609 98
United States 11,507 3,913,878 96 

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DHI Participation 2019  
Table 4. Dairy cow enrollment in DHI as of January 1, 2020, by State and test-plan category

breed=ALL

  Official Management All Plans  
State Herds Cows Herds Cows Herds Cows Percentage of cow population in DHI
Alabama 2 436 4 508 6 944 24
Arizona 12 29,548 1 8,088 13 37,636 20
Arkansas 9 1,496 4 660 13 2,156 43
California 540 852,237 16 16,673 556 868,910 50
Colorado 33 67,235 2 1,048 35 68,283 36
Connecticut 47 12,534 1 46 48 12,580 65
Delaware 13 2,668 3 94 16 2,762 73
Florida 14 22,965 12 18,512 26 41,477 35
Georgia 39 9,521 14 9,803 53 19,324 24
Idaho 97 222,221 4 4,230 101 226,451 36
Illinois 203 38,733 28 1,902 231 40,635 50
Indiana 135 51,721 80 9,976 215 61,697 35
Iowa 342 99,149 73 14,291 415 113,440 53
Kansas 78 22,787 22 2,474 100 25,261 15
Kentucky 37 8,952 158 16,625 195 25,577 52
Louisiana 7 1,194 18 2,837 25 4,031 40
Maine 84 14,537 3 520 87 15,057 54
Maryland 152 24,055 37 3,900 189 27,955 67
Massachusetts 40 3,237 10 586 50 3,823 38
Michigan 351 173,414 44 14,615 395 188,029 44
Minnesota 896 189,021 161 20,543 1,057 209,564 47
Mississippi 14 2,946 11 1,803 25 4,749 59
Missouri 100 12,327 69 7,265 169 19,592 25
Montana 13 3,167 2 148 15 3,315 28
Nebraska 42 25,214 16 3,559 58 28,773 50
Nevada 7 6,922 0 0 7 6,922 22
New Hampshire 53 6,993 5 314 58 7,307 66
New Jersey 29 2,832 1 201 30 3,033 65
New Mexico 15 70,981 0 0 15 70,981 22
New York 932 332,396 213 22,133 1,145 354,529 57
North Carolina 59 17,556 19 5,241 78 22,797 56
North Dakota 10 4,203 6 3,971 16 8,174 56
Ohio 358 71,889 175 31,880 533 103,769 41
Oklahoma 18 2,289 22 3,493 40 5,782 14
Oregon 88 38,484 4 854 92 39,338 31
Pennsylvania 1,476 206,864 1,360 93,216 2,836 300,080 62
Rhode Island 4 212 0 0 4 212 35
South Carolina 19 3,795 1 1,001 20 4,796 44
South Dakota 31 25,997 18 14,139 49 40,136 32
Tennessee 46 5,884 3 879 49 6,763 22
Texas 73 195,045 26 28,399 99 223,444 39
Utah 59 27,585 11 2,023 70 29,608 31
Vermont 177 42,619 56 7,278 233 49,897 40
Virginia 138 33,294 57 7,955 195 41,249 57
Washington 88 72,797 5 3,448 93 76,245 27
West Virginia 15 1,588 1 148 16 1,736 29
Wisconsin 1,715 575,337 838 100,877 2,553 676,214 53
United States 8,710 3,636,877 3,614 488,156 12,324 4,125,033 44 

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DHI Participation 2020  
Table 4. Testing characteristics for cow herds tested between October and December 2020 by State

  Cow Test Days
State Herds Cows Test days/
herd-year		 Supervised
(%)		 Sampled
(%)		 All milkings weighed
(%)		 All milkings sampled
(%)		 >1 Day recorded
(%)		 3X Milking
(%)
Alabama 5 713 10.0 35.5 98.9 32.5 0.0 6.6 0.0
Arizona 9 35,557 12.5 100.0 100.0 50.9 6.0 1.2 68.2
Arkansas 12 1,883 10.1 100.0 100.0 0.0 0.0 0.0 0.0
California 558 857,195 11.7 99.8 99.9 28.5 4.6 8.3 25.5
Colorado 30 44,156 11.8 98.4 94.5 47.8 6.1 36.7 93.8
Connecticut 43 9,287 10.0 99.7 88.9 29.5 0.9 27.1 54.8
Delaware 15 2,728 9.5 97.7 100.0 4.1 0.0 33.4 23.1
Florida 24 30,706 11.0 89.8 78.7 48.0 0.0 38.5 56.4
Georgia 45 17,046 10.2 97.7 88.5 37.9 0.0 27.2 49.5
Idaho 96 171,082 11.4 97.6 100.0 67.5 9.9 13.2 65.8
Illinois 232 43,077 9.6 95.7 98.5 23.0 4.6 17.1 42.0
Indiana 210 61,735 9.9 72.8 73.6 60.3 2.9 55.5 70.3
Iowa 407 115,137 9.6 93.8 98.1 29.2 0.4 16.8 57.1
Kansas 99 28,384 9.4 91.7 93.6 14.3 3.6 10.9 63.4
Kentucky 197 26,782 8.7 80.9 98.7 48.8 8.3 39.0 41.6
Louisiana 20 3,405 8.8 98.6 98.5 25.6 0.0 25.4 0.0
Maine 83 13,873 11.2 95.4 97.6 42.7 3.7 21.0 39.5
Maryland 179 28,154 10.6 93.5 94.4 33.5 8.6 30.1 26.1
Massachusetts 53 4,295 9.8 95.9 97.5 10.7 4.7 5.9 13.3
Michigan 397 179,311 10.4 98.6 91.5 20.1 1.1 25.8 62.8
Minnesota 1,010 205,589 10.8 90.9 98.6 20.2 1.5 15.5 49.2
Mississippi 23 4,441 9.6 93.1 100.0 5.5 0.0 4.2 13.6
Missouri 174 20,456 9.4 87.3 99.9 19.6 0.7 15.4 15.4
Montana 13 2,920 8.4 90.5 98.3 67.3 44.6 56.3 48.1
Nebraska 57 28,656 10.5 92.7 90.7 14.6 0.0 16.9 72.2
Nevada 8 11,163 7.8 100.0 100.0 14.0 4.9 13.3 35.0
New Hampshire 59 8,034 9.2 99.4 100.0 18.6 6.1 16.2 16.3
New Jersey 31 3,132 9.8 88.1 89.7 25.6 1.1 25.0 15.7
New Mexico 13 53,188 10.3 100.0 100.0 27.6 11.1 0.0 44.6
New York 1,100 349,317 10.7 93.9 96.5 26.3 1.0 18.1 72.1
North Carolina 76 23,815 10.5 89.4 98.0 40.8 0.0 37.6 60.9
North Dakota 16 8,317 9.5 70.9 100.0 20.0 0.0 20.7 81.3
Ohio 517 104,209 9.6 83.2 90.6 33.1 7.0 23.5 51.3
Oklahoma 42 5,828 7.8 97.1 100.0 8.1 0.2 2.3 6.0
Oregon 93 40,460 9.6 99.7 99.7 34.8 17.3 9.9 15.9
Pennsylvania 2,758 300,699 11.0 69.6 97.1 23.8 1.7 20.3 28.3
Rhode Island 4 220 6.8 100.0 100.0 62.1 0.0 62.1 0.0
South Carolina 19 4,813 11.3 99.1 98.2 23.3 0.0 25.1 8.3
South Dakota 51 42,208 10.7 96.1 99.8 26.3 1.1 16.0 78.7
Tennessee 49 7,308 9.4 90.0 95.8 28.4 0.2 22.9 26.2
Texas 88 101,421 9.7 97.7 86.0 62.8 0.0 2.7 21.8
Utah 76 35,192 9.2 97.3 100.0 76.7 33.7 41.9 43.1
Vermont 221 49,664 10.3 94.9 96.6 22.8 5.0 13.6 55.6
Virginia 193 43,125 9.0 91.3 93.4 32.8 0.7 31.9 38.2
Washington 75 73,011 10.5 100.0 99.9 53.8 11.5 14.4 61.4
West Virginia 15 1,727 9.0 91.5 96.5 34.6 5.1 24.8 19.7
Wisconsin 2,419 666,803 10.9 87.6 97.7 28.5 2.5 20.5 66.0
United States 11,914 3,870,218 10.8 92.3 96.9 31.7 3.8 17.0 48.8 

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DHI Participation 2020  
Table 5. Dairy goat enrollment in DHI as of January 1, 2021, by State and test-plan category

  Official Management All Plans
State Herds Does Herds Does Herds Does
Alabama 5 62 0 0 5 62
Arizona 10 97 4 42 14 139
Arkansas 4 43 1 32 5 75
California 55 3,844 28 1,359 83 5,203
Colorado 5 99 2 30 7 129
Connecticut 3 37 2 9 5 46
Delaware 0 0 3 20 3 20
Florida 9 66 14 128 23 194
Georgia 4 30 5 81 9 111
Idaho 15 153 7 132 22 285
Illinois 6 97 6 400 12 497
Indiana 8 144 9 63 17 207
Iowa 9 294 5 744 14 1,038
Kansas 13 163 4 60 17 223
Kentucky 8 157 1 4 9 161
Louisiana 3 21 1 15 4 36
Maine 8 105 3 34 11 139
Maryland 9 430 11 133 20 563
Massachusetts 5 56 1 76 6 132
Michigan 13 115 10 104 23 219
Minnesota 19 1,421 5 58 24 1,479
Mississippi 4 29 0 0 4 29
Missouri 7 109 1 9 8 118
Montana 4 26 5 46 9 72
Nebraska 1 6 0 0 1 6
Nevada 0 0 1 2 1 2
New Hampshire 4 34 3 14 7 48
New Jersey 3 22 1 6 4 28
New Mexico 1 5 3 30 4 35
New York 13 266 6 130 19 396
North Carolina 12 119 9 58 21 177
Ohio 25 275 8 96 33 371
Oklahoma 9 70 6 72 15 142
Oregon 37 397 34 275 71 672
Pennsylvania 19 437 19 474 38 911
South Carolina 5 45 1 4 6 49
Tennessee 13 147 5 48 18 195
Texas 19 203 23 278 42 481
Utah 8 314 6 31 14 345
Vermont 7 353 3 534 10 887
Virginia 11 152 11 79 22 231
Washington 29 337 35 236 64 573
West Virginia 1 4 4 24 5 28
Wisconsin 16 1,943 12 1,226 28 3,169
Wyoming 7 82 13 90 20 172
United States 466 12,809 331 7,286 797 20,095 

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We wish to acknowledge the contribution of the dairy producers who supplied data for this report through their participation in the DHI program and the Dairy Records Processing Centers that processed and relayed the information on to the Council on Dairy Cattle Breeding (CDCB).