Table 2. 2021 Averages of DHI cow herds by breed and test-plan category

  Records Milk Fat Protein
Breed Test Plan Category Herds Cow-years Cow-years per herd (lb) (%) (lb) % Reporting (%) (lb) % Reporting
Ayrshire Official 32 1,541 48 15,878 4.08 647 100 3.19 506 100
  Management 4 121 30 8,604 3.90 336 100 3.08 265 100
  All plans 36 1,662 46 15,350 4.07 625 100 3.18 489 100
Brown Swiss Official 102 8,648 85 20,291 4.23 858 100 3.44 698 100
  Management 4 180 45 18,460 4.35 802 100 3.44 635 100
  All plans 106 8,827 83 20,254 4.23 856 100 3.44 696 100
Guernsey Official 51 3,101 61 16,094 4.73 761 100 3.40 548 100
  Management 5 190 38 13,506 4.49 607 100 3.30 446 100
  All plans 56 3,291 59 15,945 4.72 752 100 3.40 542 100
Holstein Official 6,404 2,767,930 432 26,691 3.91 1,045 100 3.17 846 99
  Management 2,981 402,776 135 24,427 3.95 961 97 3.14 762 95
  All plans 9,385 3,170,706 338 26,404 3.92 1,034 99 3.16 836 98
Jersey Official 575 309,122 538 18,720 4.86 910 100 3.72 695 99
  Management 105 16,806 160 15,804 4.89 780 98 3.72 591 97
  All plans 680 325,928 479 18,570 4.86 904 100 3.72 690 99
Milking Shorthorn Official 14 515 37 15,028 3.68 554 100 3.14 472 100
  Management 2 121 60 13,525 3.64 493 100 3.06 414 100
  All plans 16 636 40 14,743 3.68 542 100 3.13 461 100
Multi-breeds /1 Official 1,101 387,108 352 22,517 4.17 939 100 3.33 751 100
  Management 444 79,666 179 20,775 4.08 845 93 3.29 681 93
  All plans 1,545 466,774 302 22,220 4.15 923 99 3.33 739 99
All breeds Official 8,279 3,477,965 420 25,486 4.00 1,020 100 3.22 821 99
  Management 3,545 499,859 141 23,543 3.99 937 96 3.17 743 95
  All plans 11,824 3,977,824 336 25,242 4.00 1,010 99 3.21 811 98 

1 If no breed has 75% or more of the cows, the herd is designated a multi-breed herd
 
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