Tables 7A-7F. Summary of National Standardized Lactation Averages
for Cows With Records Used in National Genetic Evaluations

  Table 7A. Records (no.)
  Calving year
Breed 1980 1990 2000 2005 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020
Ayrshire 13,465 11,576 7,035 5,989 6,045 5,977 5,727 5,559 5,318 5,235 5,077 4,676 4,261 3,764 3,710
Brown Swiss 17,236 17,717 15,704 16,029 18,069 18,243 18,379 17,997 18,028 17,911 17,036 16,634 15,485 14,462 13,815
Guernsey 38,364 25,805 9,406 7,248 6,144 6,076 5,807 5,532 5,505 5,469 5,258 5,101 4,836 4,207 3,908
Holstein 1,109,758 1,720,127 1,624,058 1,650,001 2,020,821 2,103,095 2,157,122 2,175,009 2,227,408 2,291,188 2,318,759 2,330,737 2,307,090 2,228,333 2,193,001
Jersey 63,305 99,416 106,837 128,236 182,137 209,844 229,075 253,850 274,834 296,775 317,697 337,230 361,747 370,176 359,470
Milking Shorthorn 2,302 2,684 2,407 2,723 3,091 3,288 3,166 3,126 2,771 2,606 2,558 2,551 2,375 2,103 2,535 

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  Table 7B. Milk (lb)
  Calving year
Breed 1980 1990 2000 2005 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020
Ayrshire 13,144 14,799 17,389 18,303 18,275 18,295 18,440 18,478 18,918 19,124 19,254 19,221 19,134 19,537 20,266
Brown Swiss 14,172 16,250 20,300 21,405 21,857 21,996 22,214 22,130 22,475 22,691 22,657 22,625 22,497 22,737 23,245
Guernsey 11,666 13,297 16,043 17,154 17,351 17,349 17,578 17,429 17,622 17,907 17,806 17,946 17,400 17,528 17,916
Holstein 17,566 20,178 24,517 25,644 25,757 25,987 26,312 26,639 27,031 27,251 27,441 27,418 27,405 27,686 28,023
Jersey 11,437 13,407 17,038 18,087 18,565 19,004 19,359 19,793 20,454 20,592 20,894 20,708 20,583 20,740 20,931
Milking Shorthorn 11,560 14,011 16,548 17,582 18,137 18,319 18,131 17,868 18,578 19,122 18,913 18,874 18,851 19,662 21,246 

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  Table 7C. Fat (%)
  Calving year
Breed 1980 1990 2000 2005 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020
Ayrshire 3.88 3.85 3.86 3.82 3.85 3.84 3.85 3.90 3.91 3.91 3.91 3.94 3.96 3.95 3.97
Brown Swiss 4.06 3.98 4.01 4.00 3.97 3.97 4.02 4.06 4.02 4.04 4.06 4.09 4.09 4.07 4.12
Guernsey 4.60 4.49 4.46 4.42 4.43 4.41 4.42 4.48 4.52 4.49 4.50 4.51 4.51 4.51 4.55
Holstein 3.61 3.61 3.64 3.65 3.65 3.67 3.71 3.73 3.72 3.73 3.78 3.82 3.86 3.90 3.96
Jersey 4.84 4.73 4.60 4.62 4.69 4.70 4.75 4.77 4.76 4.77 4.82 4.84 4.83 4.82 4.82
Milking Shorthorn 3.69 3.58 3.59 3.58 3.66 3.65 3.67 3.69 3.72 3.74 3.78 3.79 3.81 3.81 3.85 

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  Table 7D. Fat (lb)
  Calving year
Breed 1980 1990 2000 2005 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020
Ayrshire 510 570 671 700 704 703 711 720 740 747 753 758 758 772 805
Brown Swiss 576 646 814 856 867 874 894 898 903 918 919 924 919 926 958
Guernsey 536 598 716 758 769 766 776 781 796 804 802 810 784 790 816
Holstein 633 729 893 936 941 955 977 993 1005 1017 1037 1048 1058 1079 1111
Jersey 553 634 784 835 870 893 919 944 973 982 1007 1002 994 1000 1008
Milking Shorthorn 426 502 595 630 664 669 666 659 691 716 714 715 719 749 818 

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  Table 7E. Protein (%)
  Calving year
Breed 1980 1990 2000 2005 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020
Ayrshire 3.16 3.13 3.12 3.14 3.14 3.14 3.15 3.15 3.15 3.15 3.16 3.16 3.16 3.17
Brown Swiss 3.33 3.31 3.30 3.29 3.31 3.32 3.34 3.34 3.32 3.34 3.35 3.35 3.35 3.36
Guernsey 3.30 3.31 3.27 3.26 3.27 3.27 3.29 3.30 3.31 3.32 3.33 3.32 3.33 3.42
Holstein 2.94 3.00 3.01 3.03 3.04 3.05 3.06 3.06 3.06 3.08 3.10 3.11 3.12 3.15
Jersey 3.60 3.58 3.57 3.60 3.62 3.61 3.63 3.62 3.63 3.65 3.68 3.68 3.68 3.68
Milking Shorthorn 3.09 3.10 3.09 3.09 3.11 3.11 3.11 3.10 3.09 3.10 3.11 3.12 3.12 3.14 

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  Table 7F. Protein (lb)
  Calving year
Breed 1980 1990 2000 2005 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020
Ayrshire 468 545 571 573 574 580 581 597 602 606 607 604 616 642
Brown Swiss 541 672 707 719 729 738 739 750 754 756 758 754 762 780
Guernsey 439 531 561 565 567 575 573 581 592 592 597 578 583 613
Holstein 592 733 772 781 791 803 816 828 834 845 850 852 865 882
Jersey 482 610 646 669 688 699 718 741 748 763 762 757 764 769
Milking Shorthorn 433 512 543 561 570 563 556 576 590 587 587 588 614 668 

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