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 2003 2004 2005 2006 2007 2008
Ayrshire 13,465 11,576 9,526 7,035 6,556 6,190 5,989 6,332 6,198 6,439
Brown Swiss 17,236 17,717 17,721 15,704 15,779 15,771 16,029 17,439 17,406 17,887
Guernsey 38,364 25,805 15,420 9,406 7,880 7,508 7,248 6,852 6,727 6,386
Holstein 1,109,758 1,720,127 1,769,002 1,624,058 1,564,378 1,597,548 1,650,001 1,720,541 1,793,105 1,875,058
Jersey 63,305 99,416 105,672 106,837 115,951 121,343 128,236 137,578 143,634 154,137
Milking Shorthorn 2,302 2,684 2,662 2,407 2,619 2,619 2,723 3,094 3,056 3,157
Red and White 900 5,588 6,281 3,927 3,002 2,756 2,636 2,665 2,581 2,416 

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  Table 8B. Milk (lb)
  Calving Year
Breed 1980 1990 1995 2000 2003 2004 2005 2006 2007 2008
Ayrshire 13,144 14,799 15,684 17,389 17,738 17,885 18,303 18,232 18,220 18,145
Brown Swiss 14,172 16,250 17,493 20,300 20,715 20,757 21,405 21,413 21,533 21,522
Guernsey 11,666 13,297 14,051 16,043 16,469 16,692 17,154 17,394 17,243 17,274
Holstein 17,566 20,178 21,618 24,517 24,876 25,139 25,644 25,674 25,639 25,567
Jersey 11,437 13,407 14,842 17,038 17,612 17,732 18,087 18,159 18,265 18,328
Milking Shorthorn 11,560 14,011 15,341 16,548 17,381 17,267 17,582 17,502 17,461 17,040
Red and White 16,470 18,832 20,161 22,845 22,933 23,186 23,815 23,764 23,637 23,459 

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  Table 8C. Fat (%)
  Calving Year
Breed 1980 1990 1995 2000 2003 2004 2005 2006 2007 2008
Ayrshire 3.88 3.85 3.86 3.86 3.84 3.80 3.82 3.83 3.82 3.84
Brown Swiss 4.06 3.98 4.01 4.01 3.99 3.99 4.00 4.00 3.98 3.99
Guernsey 4.60 4.49 4.49 4.46 4.44 4.42 4.42 4.41 4.39 4.39
Holstein 3.61 3.61 3.64 3.64 3.65 3.64 3.65 3.66 3.65 3.65
Jersey 4.84 4.73 4.64 4.60 4.61 4.60 4.62 4.61 4.58 4.58
Milking Shorthorn 3.69 3.58 3.58 3.59 3.57 3.57 3.58 3.63 3.66 3.71
Red and White 3.62 3.67 3.68 3.66 3.65 3.63 3.63 3.69 3.71 3.73 

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  Table 8D. Fat (lb)
  Calving Year
Breed 1980 1990 1995 2000 2003 2004 2005 2006 2007 2008
Ayrshire 510 570 605 671 681 680 700 698 696 697
Brown Swiss 576 646 701 814 827 828 856 857 856 858
Guernsey 536 598 630 716 731 737 758 767 757 759
Holstein 633 729 786 893 907 915 936 941 936 934
Jersey 553 634 689 784 812 815 835 838 836 839
Milking Shorthorn 426 502 549 595 620 616 630 636 639 631
Red and White 596 692 742 837 837 842 865 877 878 876 

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  Table 8E. Protein (%)
  Calving Year
Breed 1980 1990 1995 2000 2003 2004 2005 2006 2007 2008
Ayrshire 3.16 3.13 3.13 3.13 3.13 3.12 3.13 3.13 3.14
Brown Swiss 3.33 3.32 3.31 3.31 3.32 3.30 3.30 3.30 3.30
Guernsey 3.30 3.27 3.31 3.29 3.29 3.27 3.27 3.27 3.26
Holstein 2.94 2.94 3.00 3.01 3.02 3.01 3.02 3.01 3.01
Jersey 3.60 3.56 3.58 3.56 3.57 3.57 3.58 3.57 3.58
Milking Shorthorn 3.09 3.07 3.10 3.08 3.09 3.09 3.10 3.09 3.09
Red and White 2.95 2.94 2.98 2.97 2.98 2.99 3.00 3.01 3.00 

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  Table 8F. Protein (lb)
  Calving Year
Breed 1980 1990 1995 2000 2003 2004 2005 2006 2007 2008
Ayrshire 468 491 545 555 560 571 570 570 569
Brown Swiss 541 581 672 685 688 707 707 710 711
Guernsey 439 460 531 541 549 561 569 563 563
Holstein 592 636 733 748 758 772 776 772 771
Jersey 482 529 610 627 633 646 650 652 656
Milking Shorthorn 433 471 512 535 533 543 540 539 527
Red and White 555 594 680 682 692 711 712 711 703 

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