State and National Standardized Lactation Averages by Breed
usda logo AIPL RESEARCH REPORT
K2-07 (2-09)

State and national standardized lactation averages by breed for cows calving in 2007

H.D. Norman and F.A. Ross, Jr.
Animal Improvement Programs Laboratory, ARS-USDA, Beltsville, MD 20705-2350
301-504-8334 (voice) ~ 301-504-8092 (fax) ~ inquiry@aipl.arsusda.gov ~ http://aipl.arsusda.gov

Lactation yields are often standardized to provide a reasonably equitable comparison of dairy cows with different lactation characteristics (e.g., calving age, days milked, milking frequency, etc.). This report provides averages of standardized yield for calvings during 2007 for each State and the nation by breed. The data originated from herds enrolled in Dairy Herd Improvement (DHI) programs. The test-day data used by the Animal Improvement Programs Laboratory to determine the lactation records were provided by the dairy records processing centers (DRPC's). Participation in DHI programs and DRPC activity also have been summarized using the same data source.

Only data used in calculation of national genetic evaluations are included in the State and national averages. Thus, records beyond fifth lactation or by cows that lacked either a first-lactation record or valid sire identification were excluded. For other editing requirements, see complete evaluation documentation.

Breed yields are different between this report and the herd-average report because this report summarizes standardized lactation yield (i.e.., yield adjusted to 305 days and twice a day milking), whereas the herd-average report is determined from actual herd yields. Input data to the herd-average reports are not restricted to those usable for national genetic evaluations. The herd-average report also is impacted by lactation length and dry period. Relative yields among breeds differ between the two reports because of large breed differences in percentage of usable records and differences in age-parity factors. Also, the herd-average reports tend to be more current (about 6 mo) than the standardized yield reports released at the same time.

Lactation records were calculated using the best prediction method starting in 1997 and were standardized for age-parity, calving month, previous days open, and times milked per day. Records shorter than 305 days were extended to 305 days as part of the best prediction process. Prior to 1997, the records were calculated using the test interval method. The change in how lactation records were calculated was responsible for a portion of the observed yield increases between 1996 and 1997 because the best prediction method gives a more favorable prediction for lower producing cows than does the test interval method. Numbers of records and averages for yields and component percentages are in Tables 1 through 7 by State for Ayrshires, Brown Swiss, Guernseys, Holsteins, Jerseys, Milking Shorthorns, and Red and Whites, respectively. Component percentages were computed from averages of standardized yields for milk and components. This year is the first that 100% of the cows tested for fat also have protein information. Only 97% of the cows had protein percentage and yield last year.

Numbers of records and national averages for milk and component yields and component percentages are in Table 8 by breed for selected years. Only Holsteins and Jerseys had increased calvings (Table 8A) in 2007. Holstein calvings were up 4.2%; Jersey calvings increased by 4.4%. Average milk yield (Table 8B) was down slightly (−0.5 to −0.1%) for Ayrshires, Holsteins, and Milking Shorthorn. Guernseys, which increased the most (1.4%) last year, declined the most this year (−0.9%). Only Brown Swiss and Jerseys increased in average milk yield (0.6%). Fat percentage (Table 8C) showed little change for all breeds, up or down by less than 0.03%. Fat yield (Table 8D) increased by 1 and 3 pounds for Red and Whites and Milking Shorthorns, respectively, but declined for all other breeds (1 to 10 pounds). Protein percentage (Table 8E) never changed by more than 0.01 for any of the breeds. Breed-average protein yield (Table 8F) increased from 2 to 3 pounds for Jerseys and Brown Swiss but decreased by 1 and 6 pounds for four of the other breeds. Ayrshire average protein yield remained the same.

Although milk and beef prices, feed availability and operating expenses, Government programs, and characteristics of herds entering and leaving eligible testing programs can affect production averages, genetic change continues to have a positive effect on yield. The leveling off of average yields most likely reflects changes in management strategies and more genetic emphasis on other traits such as health and longevity. For instance, average somatic cell count during 2008 dropped considerably from 2007 (herd somatic cell count report), and days open is no longer increasing. Interpretation of trends in lactation averages should be made in view of other changes affecting profitability and will be impacted by changes in number of records across years as well.

DHI Lactation Averages for Ayrshire  
Table 1. Ayrshire State and National Standardized Lactation Averages for Cows Calving in 2007 With Records
Used in National Genetic Evaluations.

  Records Milk Fat Protein
State (no.) (lb) (%) (lb) (%) (lb) Reporting
Alabama 4 14,267 3.53 503 3.10 443 100
Arizona 1 22,241 3.82 849 3.20 712 100
Arkansas 34 16,070 4.02 646 3.26 524 100
California 19 23,687 3.78 896 3.09 732 100
Colorado 6 20,193 3.89 785 3.26 658 100
Connecticut 113 19,549 3.97 776 3.17 619 100
Delaware 1 18,300 3.93 720 3.21 588 100
Florida 1 19,992 3.58 715 3.00 599 100
Idaho 1 17,648 4.39 775 3.38 597 100
Illinois 242 18,145 3.83 696 3.13 567 100
Indiana 59 16,076 3.75 603 3.17 510 100
Iowa 571 19,978 3.79 756 3.15 629 100
Kansas 70 16,117 3.64 587 3.16 509 100
Kentucky 25 15,127 3.21 486 3.23 488 100
Louisiana 7 15,407 3.67 565 2.99 461 100
Maine 124 17,241 3.71 639 3.07 529 100
Maryland 313 20,095 4.03 809 3.15 633 100
Massachusetts 26 17,488 3.77 659 3.12 546 100
Michigan 56 19,499 3.79 739 3.09 603 100
Minnesota 204 17,792 3.83 681 3.10 551 100
Missouri 89 15,240 3.87 590 3.13 477 100
Nebraska 59 15,065 3.79 571 3.18 479 100
New Hampshire 124 17,638 3.87 682 3.12 551 100
New Jersey 18 15,803 4.00 632 3.14 496 100
New Mexico 185 17,060 3.93 671 3.18 543 100
New York 1,087 17,983 3.80 684 3.12 561 100
North Carolina 42 18,504 3.95 731 3.15 584 100
Ohio 437 18,577 3.85 715 3.16 587 100
Oklahoma 99 19,725 3.56 702 3.09 609 100
Oregon 38 17,004 3.70 630 3.12 530 100
Pennsylvania 910 18,776 3.79 711 3.11 583 100
Rhode Island 43 16,640 4.26 709 3.23 537 100
South Carolina 6 18,446 4.17 769 3.10 572 100
Tennessee 15 16,215 3.56 578 3.07 497 100
Texas 76 16,942 3.88 657 3.21 543 100
Utah 20 12,904 3.62 467 3.32 428 100
Vermont 398 16,952 3.84 651 3.11 527 100
Virginia 24 17,143 3.81 654 3.13 537 100
Washington 28 18,610 3.98 741 3.25 604 100
West Virginia 19 16,887 3.75 633 3.10 523 100
Wisconsin 604 18,021 3.80 684 3.11 561 100
US 6,198 18,220 3.82 696 3.13 570 100 

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DHI Lactation Averages for Brown Swiss  
Table 2. Brown Swiss State and National Standardized Lactation Averages for Cows Calving in 2007 With Records
Used in National Genetic Evaluations.

  Records Milk Fat Protein
State (no.) (lb) (%) (lb) (%) (lb) Reporting
Alabama 7 23,731 3.46 821 3.09 733 100
Arizona 130 24,351 3.76 915 3.19 777 100
Arkansas 91 17,109 3.92 670 3.34 572 100
California 463 22,751 3.86 878 3.30 751 100
Colorado 167 22,448 3.63 814 3.24 728 100
Connecticut 54 18,465 3.94 728 3.24 599 100
Delaware 4 20,903 4.02 840 3.34 697 100
Florida 33 21,069 3.74 787 3.09 651 100
Georgia 99 20,897 3.70 774 3.23 675 100
Idaho 250 21,040 3.87 814 3.40 715 100
Illinois 669 20,283 4.03 817 3.30 669 100
Indiana 544 22,880 4.00 916 3.33 762 100
Iowa 1,524 21,664 3.98 862 3.34 723 100
Kansas 177 21,807 3.80 828 3.34 728 100
Kentucky 101 19,943 3.74 746 3.28 654 100
Louisiana 82 15,770 3.42 539 3.14 495 100
Maine 30 18,150 3.82 693 3.28 595 100
Maryland 320 21,841 4.09 892 3.35 732 100
Massachusetts 141 21,408 4.14 887 3.31 709 100
Michigan 382 23,576 3.90 919 3.33 786 100
Minnesota 1,557 22,710 4.03 915 3.26 739 100
Mississippi 7 18,501 3.70 684 3.24 600 100
Missouri 458 18,948 4.11 779 3.39 643 100
Montana 1 25,600 4.27 1094 3.54 905 100
Nebraska 146 19,314 4.03 779 3.33 643 100
Nevada 2 30,294 3.69 1117 2.49 754 100
New Hampshire 112 17,846 4.05 722 3.28 586 100
New Jersey 6 24,479 3.96 969 3.29 806 100
New Mexico 15 22,110 3.59 794 3.24 717 100
New York 1,328 21,149 3.99 845 3.28 693 100
North Carolina 55 22,815 3.97 907 3.25 742 100
North Dakota 88 17,220 4.09 704 3.44 593 100
Ohio 1,379 21,208 3.97 841 3.31 703 100
Oklahoma 57 15,347 3.74 574 3.29 505 100
Oregon 299 21,656 3.91 846 3.29 713 100
Pennsylvania 1,291 21,641 4.00 866 3.29 712 100
Puerto Rico 43 15,898 3.00 476 3.22 512 100
Rhode Island 1 16,478 4.05 667 3.29 542 100
South Carolina 12 22,718 3.83 870 3.20 728 100
South Dakota 143 19,602 4.30 843 3.33 652 100
Tennessee 188 17,482 3.82 668 3.30 577 100
Texas 426 19,079 3.97 758 3.34 637 100
Utah 34 19,810 4.08 809 3.29 653 100
Vermont 391 20,896 4.14 866 3.37 704 100
Virginia 176 22,664 3.89 882 3.22 729 100
Washington 301 21,877 3.92 858 3.36 735 100
West Virginia 15 24,490 4.01 982 3.36 822 100
Wisconsin 3,607 22,415 3.98 893 3.27 733 100
US 17,406 21,533 3.98 856 3.30 710 100 

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DHI Lactation Averages for Guernsey  
Table 3. Guernsey State and National Standardized Lactation Averages for Cows Calving in 2007 With Records
Used in National Genetic Evaluations.

  Records Milk Fat Protein
State (no.) (lb) (%) (lb) (%) (lb) Reporting
Arizona 5 19,037 3.64 694 2.93 558 100
Arkansas 7 15,350 4.26 653 3.34 512 100
California 386 18,773 4.20 789 3.30 620 100
Colorado 2 19,310 5.89 1137 3.21 621 100
Connecticut 38 17,821 4.30 767 3.35 597 100
Delaware 1 14,374 4.84 696 3.35 481 100
Florida 1 23,341 3.44 803 3.12 728 100
Idaho 25 17,457 4.46 778 3.37 588 100
Illinois 127 16,362 4.41 722 3.23 529 100
Indiana 249 17,048 4.27 728 3.32 565 100
Iowa 560 17,954 4.38 787 3.29 591 100
Kansas 44 18,634 4.34 809 3.34 622 100
Kentucky 18 17,185 3.81 654 3.21 551 100
Louisiana 1 10,173 4.00 407 3.12 317 100
Maine 44 15,369 4.49 690 3.31 508 100
Maryland 335 15,888 4.53 719 3.36 534 100
Massachusetts 27 13,595 4.67 634 3.29 448 100
Michigan 27 13,610 4.02 548 3.12 424 100
Minnesota 339 16,192 4.33 701 3.22 521 100
Missouri 308 15,516 4.43 687 3.36 521 100
Nebraska 63 18,034 4.47 806 3.33 600 100
New Hampshire 10 16,106 4.60 741 3.37 542 100
New Jersey 5 18,912 4.23 799 3.11 587 100
New York 562 17,115 4.42 757 3.22 551 100
North Carolina 34 15,451 4.46 689 3.27 505 100
Ohio 260 17,690 4.50 796 3.30 584 100
Oklahoma 40 15,430 4.07 628 3.20 494 100
Oregon 283 18,323 4.29 785 3.22 590 100
Pennsylvania 657 17,041 4.36 743 3.23 550 100
South Carolina 42 15,527 4.39 681 3.25 505 100
South Dakota 57 13,325 4.32 575 3.23 431 100
Tennessee 80 16,416 4.20 689 3.19 524 100
Texas 116 15,019 4.09 614 3.22 484 100
Vermont 122 15,157 4.53 686 3.30 501 100
Virginia 100 16,785 4.53 760 3.31 556 100
Washington 117 17,890 4.44 795 3.34 598 100
West Virginia 8 15,159 4.63 702 3.54 537 100
Wisconsin 1,627 18,127 4.45 806 3.24 588 100
US 6,727 17,243 4.39 757 3.27 563 100 

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DHI Lactation Averages for Holstein  
Table 4. Holstein State and National Standardized Lactation Averages for Cows Calving in 2007 With Records
Used in National Genetic Evaluations.

  Records Milk Fat Protein
State (no.) (lb) (%) (lb) (%) (lb) Reporting
Alabama 832 21,235 3.43 728 3.02 641 100
Arizona 19,209 24,737 3.55 877 2.98 738 100
Arkansas 1,414 21,648 3.51 761 3.04 658 100
California 405,272 26,476 3.58 947 3.00 795 100
Colorado 12,893 25,730 3.57 919 3.10 797 100
Connecticut 6,411 24,226 3.71 899 3.06 741 100
Delaware 2,264 24,817 3.82 948 3.01 746 100
Florida 6,397 23,683 3.58 848 2.95 698 100
Georgia 8,241 23,201 3.54 822 3.00 695 100
Idaho 62,022 26,489 3.57 945 3.06 810 100
Illinois 24,671 24,832 3.66 908 3.02 751 100
Indiana 17,964 24,676 3.68 907 3.01 743 100
Iowa 48,460 25,415 3.64 925 3.04 772 100
Kansas 11,698 24,172 3.73 902 3.07 743 100
Kentucky 6,911 23,329 3.60 840 3.03 708 100
Louisiana 1,991 20,342 3.41 693 2.99 607 100
Maine 6,250 24,502 3.69 904 3.03 743 100
Maryland 18,789 24,347 3.75 913 3.03 739 100
Massachusetts 4,502 24,770 3.84 952 3.06 757 100
Michigan 66,766 26,592 3.71 985 2.98 791 100
Minnesota 132,569 24,984 3.71 926 3.00 749 100
Mississippi 2,085 23,151 3.55 821 2.96 685 100
Missouri 9,410 22,038 3.64 802 3.08 678 100
Montana 2,493 25,859 3.60 930 2.97 769 100
Nebraska 9,847 24,050 3.63 872 3.04 732 100
Nevada 5,123 27,754 3.47 962 2.94 815 100
New Hampshire 5,686 26,245 3.72 977 3.05 802 100
New Jersey 3,286 24,320 3.69 898 3.00 729 100
New Mexico 19,184 24,933 3.55 884 3.04 758 100
New York 188,339 25,325 3.68 933 3.03 766 100
North Carolina 10,891 24,540 3.76 923 3.01 739 100
North Dakota 2,383 24,421 3.65 891 3.01 735 100
Ohio 47,460 25,007 3.69 922 3.02 756 100
Oklahoma 3,107 22,145 3.43 759 3.03 670 100
Oregon 17,235 25,142 3.73 938 3.05 767 100
Pennsylvania 172,424 25,385 3.66 928 3.00 761 100
Puerto Rico 1,927 14,459 2.99 432 2.95 427 100
Rhode Island 56 23,053 3.80 875 3.01 694 100
South Carolina 4,228 24,687 3.53 870 2.99 737 100
South Dakota 9,308 24,614 3.68 907 3.03 745 100
Tennessee 7,256 23,357 3.77 881 2.98 696 100
Texas 21,616 23,600 3.69 872 3.10 731 100
Utah 12,265 24,788 3.59 891 3.06 759 100
Vermont 25,398 25,236 3.70 934 3.07 775 100
Virginia 31,173 24,278 3.64 883 2.98 724 100
Washington 33,979 26,102 3.65 954 3.06 798 100
West Virginia 2,157 23,520 3.66 861 3.03 712 100
Wisconsin 278,858 26,357 3.70 976 3.00 790 100
Wyoming 405 26,452 3.60 952 2.94 778 100
US 1,793,105 25,639 3.65 936 3.01 772 100 

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DHI Lactation Averages for Jersey  
Table 5. Jersey State and National Standardized Lactation Averages for Cows Calving in 2007 With Records
Used in National Genetic Evaluations.

  Records Milk Fat Protein
State (no.) (lb) (%) (lb) (%) (lb) Reporting
Alabama 1,401 15,604 4.43 692 3.55 554 100
Arizona 5,892 18,533 4.53 839 3.48 644 100
Arkansas 130 14,858 4.83 718 3.47 515 100
California 48,796 19,542 4.54 888 3.58 699 100
Colorado 338 18,944 4.92 932 3.42 647 100
Connecticut 487 16,489 4.69 773 3.55 585 100
Delaware 87 22,412 4.65 1043 3.35 751 100
Florida 111 17,151 4.61 791 3.35 574 100
Georgia 290 15,433 4.40 678 3.48 536 100
Idaho 3,835 18,717 4.59 860 3.66 685 100
Illinois 1,517 16,791 4.57 768 3.57 600 100
Indiana 1,147 17,007 4.59 780 3.58 608 100
Iowa 3,589 18,250 4.65 849 3.57 651 100
Kansas 1,135 17,589 4.57 803 3.60 633 100
Kentucky 1,087 15,776 4.42 698 3.52 555 100
Louisiana 135 16,748 3.90 654 3.40 569 100
Maine 655 17,018 4.70 800 3.57 607 100
Maryland 976 17,180 4.71 809 3.64 625 100
Massachusetts 720 16,798 4.70 790 3.58 602 100
Michigan 1,219 16,830 4.73 796 3.59 604 100
Minnesota 2,589 17,221 4.59 790 3.52 606 100
Mississippi 530 16,892 4.32 730 3.48 588 100
Missouri 1,680 15,490 4.56 707 3.58 555 100
Montana 10 15,430 4.56 704 3.78 584 100
Nebraska 427 19,678 4.47 879 3.55 698 100
Nevada 345 17,761 4.47 795 3.58 635 100
New Hampshire 545 17,139 4.63 793 3.61 619 100
New Jersey 106 15,995 4.88 781 3.55 567 100
New Mexico 1,902 17,360 4.56 791 3.59 624 100
New York 5,724 17,785 4.56 810 3.51 625 100
North Carolina 2,132 19,364 4.44 859 3.48 674 100
North Dakota 53 16,909 4.64 784 3.62 613 100
Ohio 7,054 17,859 4.72 843 3.58 640 100
Oklahoma 911 15,563 4.31 671 3.58 556 100
Oregon 8,684 18,437 4.62 851 3.64 672 100
Pennsylvania 7,260 17,219 4.66 802 3.56 612 100
Puerto Rico 52 13,320 3.23 431 3.29 438 100
Rhode Island 4 17,160 4.65 797 3.59 617 100
South Carolina 2,239 17,966 4.57 821 3.49 628 100
South Dakota 659 18,015 4.71 848 3.53 635 100
Tennessee 2,028 16,626 4.59 763 3.50 581 100
Texas 6,914 16,128 4.45 718 3.61 583 100
Utah 1,741 17,475 4.60 804 3.64 636 100
Vermont 2,463 16,220 4.68 759 3.58 581 100
Virginia 1,011 17,827 4.48 799 3.48 621 100
Washington 2,493 17,691 4.53 802 3.59 635 100
West Virginia 339 19,203 4.50 863 3.60 691 100
Wisconsin 10,192 18,383 4.68 861 3.56 655 100
US 143,634 18,265 4.58 836 3.57 652 100 

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DHI Lactation Averages for Milking Shorthorn  
Table 6. Milking Shorthorn State and National Standardized Lactation Averages for Cows Calving in 2007 With
Records Used in National Genetic Evaluations.

  Records Milk Fat Protein
State (no.) (lb) (%) (lb) (%) (lb) Reporting
Alabama 1 20,163 4.29 865 3.10 625 100
Arizona 280 13,680 3.38 462 3.01 412 100
Arkansas 105 18,311 4.03 738 3.23 591 100
California 201 19,974 3.29 658 2.96 592 100
Colorado 14 21,831 3.50 763 3.24 708 100
Connecticut 7 15,622 3.54 553 3.01 470 100
Georgia 3 12,617 3.55 448 3.16 399 100
Idaho 65 19,682 3.24 637 3.07 603 100
Illinois 37 16,764 3.65 613 3.09 518 100
Indiana 49 17,250 3.67 633 3.21 555 100
Iowa 85 19,328 3.69 713 3.09 598 100
Kansas 25 18,861 3.62 683 3.07 579 100
Kentucky 1 18,250 3.84 700 3.02 551 100
Louisiana 1 20,352 4.41 898 2.82 574 100
Maine 23 19,106 3.64 696 3.04 581 100
Maryland 21 18,704 3.79 708 3.04 568 100
Massachusetts 16 14,673 3.81 558 3.13 459 100
Michigan 21 17,193 3.87 665 3.15 542 100
Minnesota 324 17,158 3.75 644 3.06 525 100
Mississippi 1 20,129 3.67 738 3.18 641 100
Missouri 60 15,943 3.71 591 3.16 504 100
Nebraska 23 15,010 3.38 508 3.08 463 100
New Hampshire 76 18,127 3.76 681 3.10 562 100
New York 91 17,906 3.58 642 3.06 548 100
North Carolina 2 16,736 3.41 570 3.10 519 100
Ohio 111 18,740 3.61 676 3.08 577 100
Oklahoma 152 16,504 3.31 546 3.04 501 100
Oregon 56 18,061 3.56 643 3.03 548 100
Pennsylvania 137 19,646 3.68 724 3.09 607 100
Rhode Island 2 17,009 4.20 714 3.25 553 100
South Dakota 109 19,344 4.20 813 3.09 598 100
Tennessee 1 15,217 3.93 598 3.07 467 100
Texas 357 17,403 3.87 673 3.22 561 100
Utah 52 14,440 3.61 522 3.11 449 100
Vermont 65 15,542 3.56 553 3.07 477 100
Virginia 14 19,738 3.72 735 3.02 596 100
Washington 110 17,123 3.54 607 3.04 521 100
West Virginia 1 14,386 3.91 562 3.11 448 100
Wisconsin 357 17,576 3.78 664 3.10 544 100
US 3,056 17,461 3.66 639 3.09 539 100 

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DHI Lactation Averages for Red & White  
Table 7. Red & White State and National Standardized Lactation Averages for Cows Calving in 2007 With Records
Used in National Genetic Evaluations.

  Records Milk Fat Protein
State (no.) (lb) (%) (lb) (%) (lb) Reporting
Alabama 4 22,356 3.81 851 3.14 702 100
Arkansas 13 18,429 3.41 629 3.03 558 100
California 203 24,283 3.56 865 2.98 723 100
Colorado 12 25,660 3.22 826 3.06 784 100
Connecticut 1 21,243 3.92 832 3.07 653 100
Delaware 1 24,309 4.51 1097 3.28 797 100
Georgia 1 24,355 3.30 803 2.89 703 100
Idaho 17 26,645 3.40 905 3.19 849 100
Illinois 81 22,515 3.77 848 3.02 680 100
Indiana 4 23,529 3.73 878 3.04 716 100
Iowa 34 24,226 3.51 851 3.08 745 100
Kansas 14 20,514 3.77 773 3.19 654 100
Kentucky 25 24,008 3.84 922 3.08 741 100
Maine 1 22,765 3.74 851 3.21 730 100
Maryland 9 23,347 3.82 891 3.08 720 100
Michigan 215 24,326 3.81 926 3.01 733 100
Minnesota 273 23,086 3.72 858 2.98 688 100
Missouri 3 18,726 3.62 678 3.00 562 100
Nebraska 3 21,733 3.50 760 3.16 686 100
New Hampshire 1 29,399 3.51 1031 2.87 845 100
New York 288 23,466 3.72 874 2.98 699 100
North Carolina 13 23,740 4.01 951 3.16 750 100
North Dakota 2 25,975 3.50 909 3.00 778 100
Ohio 63 22,468 3.81 857 3.04 684 100
Oklahoma 8 19,112 3.46 662 2.95 564 100
Oregon 10 25,466 3.67 935 2.94 750 100
Pennsylvania 404 23,541 3.74 880 3.06 719 100
Puerto Rico 23 13,402 3.35 449 2.97 398 100
South Carolina 127 25,065 3.59 900 3.04 762 100
Texas 17 20,741 4.06 841 3.25 674 100
Vermont 5 20,866 3.64 760 2.97 620 100
Virginia 124 23,475 3.78 887 3.00 705 100
Washington 2 25,195 3.58 902 3.23 814 100
Wisconsin 580 24,155 3.73 901 2.98 720 100
US 2,581 23,637 3.71 878 3.01 711 100 

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DHI Lactation Averages Over Time  
Tables 8A-8F. Summary of National Standardized Lactation Averages
for Cows With Records Used in National Genetic Evaluations.

  Table 8A. Number of Records
  Calving Year
Breed 1980 1990 1995 2000 2001 2002 2003 2004 2005 2006 2007
Ayrshire 13,465 11,576 9,526 7,035 6,552 6,755 6,556 6,190 5,989 6,332 6,198
Brown Swiss 17,236 17,717 17,721 15,704 15,473 15,639 15,779 15,771 16,029 17,439 17,406
Guernsey 38,364 25,805 15,420 9,406 8,690 8,293 7,880 7,508 7,248 6,852 6,727
Holstein 1,109,758 1,720,127 1,769,002 1,624,058 1,588,990 1,589,782 1,564,378 1,597,548 1,650,001 1,720,541 1,793,105
Jersey 63,305 99,416 105,672 106,837 108,934 115,472 115,951 121,343 128,236 137,578 143,634
Milking Shorthorn 2,302 2,684 2,662 2,407 2,323 2,534 2,619 2,619 2,723 3,094 3,056
Red and White 900 5,588 6,281 3,927 3,578 3,334 3,002 2,756 2,636 2,665 2,581 

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  Table 8B. Milk (lbs)
  Calving Year
Breed 1980 1990 1995 2000 2001 2002 2003 2004 2005 2006 2007
Ayrshire 13,144 14,799 15,684 17,389 17,878 17,880 17,738 17,885 18,303 18,232 18,220
Brown Swiss 14,172 16,250 17,493 20,300 20,694 20,869 20,715 20,757 21,405 21,413 21,533
Guernsey 11,666 13,297 14,051 16,043 16,410 16,398 16,469 16,692 17,154 17,394 17,243
Holstein 17,566 20,178 21,618 24,517 24,889 24,996 24,876 25,139 25,644 25,674 25,639
Jersey 11,437 13,407 14,842 17,038 17,472 17,663 17,612 17,732 18,087 18,159 18,265
Milking Shorthorn 11,560 14,011 15,341 16,548 17,008 17,144 17,381 17,267 17,582 17,502 17,461
Red and White 16,470 18,832 20,161 22,845 22,981 23,102 22,933 23,186 23,815 23,764 23,637 

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  Table 8C. Fat (%)
  Calving Year
Breed 1980 1990 1995 2000 2001 2002 2003 2004 2005 2006 2007
Ayrshire 3.88 3.85 3.86 3.86 3.84 3.85 3.84 3.80 3.82 3.83 3.82
Brown Swiss 4.06 3.98 4.01 4.01 4.00 4.01 3.99 3.99 4.00 4.00 3.98
Guernsey 4.60 4.49 4.49 4.46 4.44 4.45 4.44 4.42 4.42 4.41 4.39
Holstein 3.61 3.61 3.64 3.64 3.63 3.65 3.65 3.64 3.65 3.66 3.65
Jersey 4.84 4.73 4.64 4.60 4.59 4.61 4.61 4.60 4.62 4.61 4.58
Milking Shorthorn 3.69 3.58 3.58 3.59 3.57 3.58 3.57 3.57 3.58 3.63 3.66
Red and White 3.62 3.67 3.68 3.66 3.65 3.65 3.65 3.63 3.63 3.69 3.71 

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  Table 8D. Fat (lbs)
  Calving Year
Breed 1980 1990 1995 2000 2001 2002 2003 2004 2005 2006 2007
Ayrshire 510 570 605 671 687 689 681 680 700 698 696
Brown Swiss 576 646 701 814 827 837 827 828 856 857 856
Guernsey 536 598 630 716 728 730 731 737 758 767 757
Holstein 633 729 786 893 904 911 907 915 936 941 936
Jersey 553 634 689 784 802 814 812 815 835 838 836
Milking Shorthorn 426 502 549 595 608 614 620 616 630 636 639
Red and White 596 692 742 837 839 843 837 842 865 877 878 

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  Table 8E. Protein (%)
  Calving Year
Breed 1980 1990 1995 2000 2001 2002 2003 2004 2005 2006 2007
Ayrshire 3.16 3.13 3.13 3.12 3.12 3.13 3.13 3.12 3.13 3.13
Brown Swiss 3.33 3.32 3.31 3.30 3.30 3.31 3.32 3.30 3.30 3.30
Guernsey 3.30 3.27 3.31 3.29 3.28 3.29 3.29 3.27 3.27 3.27
Holstein 2.94 2.94 3.00 3.00 3.00 3.01 3.02 3.01 3.02 3.01
Jersey 3.60 3.56 3.58 3.57 3.55 3.56 3.57 3.57 3.58 3.57
Milking Shorthorn 3.09 3.07 3.10 3.07 3.08 3.08 3.09 3.09 3.10 3.09
Red and White 2.95 2.94 2.98 2.97 2.96 2.97 2.98 2.99 3.00 3.01 

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  Table 8F. Protein (lbs)
  Calving Year
Breed 1980 1990 1995 2000 2001 2002 2003 2004 2005 2006 2007
Ayrshire 468 491 545 558 558 555 560 571 570 570
Brown Swiss 541 581 672 683 688 685 688 707 707 710
Guernsey 439 460 531 540 538 541 549 561 569 563
Holstein 592 636 733 745 749 748 758 772 776 772
Jersey 482 529 610 625 628 627 633 646 650 652
Milking Shorthorn 433 471 512 522 528 535 533 543 540 539
Red and White 555 594 680 683 684 682 692 711 712 711 

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