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

  Table 8A. Records (no.)
  Calving year
Breed 1980 1990 2000 2005 2010 2011 2012
Ayrshire 13,465 11,576 7,035 5,989 6,045 5,977 5,727
Brown Swiss 17,236 17,717 15,704 16,029 18,069 18,243 18,379
Guernsey 38,364 25,805 9,406 7,248 6,144 6,076 5,807
Holstein 1,109,758 1,720,127 1,624,058 1,650,001 2,020,821 2,103,095 2,157,122
Jersey 63,305 99,416 106,837 128,236 182,137 209,844 229,075
Milking Shorthorn 2,302 2,684 2,407 2,723 3,091 3,288 3,166
Red and White 900 5,588 3,927 2,636 2,370 2,306 2,237 

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  Table 8B. Milk (lb)
  Calving year
Breed 1980 1990 2000 2005 2010 2011 2012
Ayrshire 13,144 14,799 17,389 18,303 18,275 18,295 18,440
Brown Swiss 14,172 16,250 20,300 21,405 21,857 21,996 22,214
Guernsey 11,666 13,297 16,043 17,154 17,351 17,349 17,578
Holstein 17,566 20,178 24,517 25,644 25,757 25,987 26,312
Jersey 11,437 13,407 17,038 18,087 18,565 19,004 19,359
Milking Shorthorn 11,560 14,011 16,548 17,582 18,137 18,319 18,131
Red and White 16,470 18,832 22,845 23,815 23,342 23,439 23,679 

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  Table 8C. Fat (%)
  Calving year
Breed 1980 1990 2000 2005 2010 2011 2012
Ayrshire 3.88 3.85 3.86 3.82 3.85 3.84 3.85
Brown Swiss 4.06 3.98 4.01 4.00 3.97 3.97 4.02
Guernsey 4.60 4.49 4.46 4.42 4.43 4.41 4.42
Holstein 3.61 3.61 3.64 3.65 3.65 3.67 3.71
Jersey 4.84 4.73 4.60 4.62 4.69 4.70 4.75
Milking Shorthorn 3.69 3.58 3.59 3.58 3.66 3.65 3.67
Red and White 3.62 3.67 3.66 3.63 3.73 3.72 3.72 

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  Table 8D. Fat (lb)
  Calving year
Breed 1980 1990 2000 2005 2010 2011 2012
Ayrshire 510 570 671 700 704 703 711
Brown Swiss 576 646 814 856 867 874 894
Guernsey 536 598 716 758 769 766 776
Holstein 633 729 893 936 941 955 977
Jersey 553 634 784 835 870 893 919
Milking Shorthorn 426 502 595 630 664 669 666
Red and White 596 692 837 865 871 872 880 

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  Table 8E. Protein (%)
  Calving year
Breed 1980 1990 2000 2005 2010 2011 2012
Ayrshire 3.16 3.13 3.12 3.14 3.14 3.14
Brown Swiss 3.33 3.31 3.30 3.29 3.31 3.32
Guernsey 3.30 3.31 3.27 3.26 3.27 3.27
Holstein 2.94 3.00 3.01 3.03 3.04 3.05
Jersey 3.60 3.58 3.57 3.60 3.62 3.61
Milking Shorthorn 3.09 3.10 3.09 3.09 3.11 3.11
Red and White 2.95 2.98 2.99 3.02 3.05 3.05 

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  Table 8F. Protein (lb)
  Calving year
Breed 1980 1990 2000 2005 2010 2011 2012
Ayrshire 468 545 571 573 574 580
Brown Swiss 541 672 707 719 729 738
Guernsey 439 531 561 565 567 575
Holstein 592 733 772 781 791 803
Jersey 482 610 646 669 688 699
Milking Shorthorn 433 512 543 561 570 563
Red and White 555 680 711 705 714 722 

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