Page 6 - Loonan Stock Farm 46th Annual Production Sale, Red Angus, Simmental, F1 Cross – Feb. 6, 2021
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Red Angus Guide to EPDS and  Indexes




        ProS ... Profi tability and Sustainability is   HB ..... HerdBuilder is a maternal selection   GM..... GridMaster is a selection index that
        an all-purpose index that predicts average   index that predicts the economic differences   predicts the average economic difference of
        economic differences in all segments in the   of animals for traits that are important from   non-replacement calves through the post-
        beef supply chain. This index is a combination   conception through weaning. Expressed   weaning phase of production. GM places
        of the breeding objectives modeled in the   as dollars per head born, HB is calculated   selection pressure on growth, feedyard
        HerdBuilder and GridMaster selection indexes.   based on the scenario that bulls are mated   performance and carcass traits. Expressed as
        In this index, replacement heifers are retained   to heifers and cows, replacement heifers   dollars per head born, GM is calculated based
        from within the herd and all remaining   are retained and all remaining progeny are   on the scenario that progeny are fed out to
        progeny are fed out to slaughter and sold on a   marketed at weaning. Traits included in the   slaughter and marketed on a quality-based
        quality-based grid. Traits included in this index  HB index include Calving Ease Direct, Calving   carcass grid. Traits included in GM include
        include calving ease, growth, HPG, STAY,   Ease Maternal, Weaning Weight, Milk, Mature   Average Daily Gain, Carcass Weight, Dry
        Mature Weight, Dry Matter Intake and carcass   Weight, Heifer Pregnancy and Stayability   Matter Intake, Marbling, Back Fat and Rib Eye
        traits. The resulting index is expressed in   (Index/High Value).         Area (Index/High Value).
        dollars per head born (Index/High Value).



        CED .......Calving Ease Direct predicts differences in the percent of calves born   CEM ......Calving Ease Maternal predicts differences in the percent of daughters
        unassisted out of 2-year-old dams. (Percent/High Value)  who are able to calve unassisted as 2-year-old heifers. (Percent/High Value)
        BW ........Birth Weight predicts differences in actual birth weight of progeny.   STAY......Stayability predicts differences in the ability of an animals’ retained
        (Pounds/Low Value)                                     daughters to remain productive in the herd – calve every year – through 6
                                                               years of age. (Percent/High Value)
        WW .......Weaning Weight predicts differences in 205-day weaning weight.
        (Pounds/High Value)                                    MARB ....Marbling predicts differences in marbling score – amount of
                                                               intramuscular fat measured at the 13th rib. (Marbling Score Units/High Value)
        YW ........Yearling Weight predicts differences in 365-day yearling weight.
        (Pounds/High Value)                                    YG .........Yield Grade predicts differences in USDA Yield Grade, which is
                                                               calculated using CW, REA and Fat. (Yield Grade Units/Low Value)
        ADG .......Average Daily Gain predicts differences in weight gain between 205
        and 365 days of age. (Pounds/High Value)               CW ........Carcass Weight predicts differences in actual hot carcass weight.
                                                               (Pounds/High Value)
        DMI .......Dry Matter Intake predicts differences in daily feed intake as measured
        in a feedlot during the post-weaning period. (Pounds/Low Value)  REA .......Ribeye Area predicts differences in square inches of ribeye area
                                                               measured at the 13th rib.(Square Inches/High Value)
        MILK .....Milk predicts differences in weaning weight attributed to the milking
        ability of the animal’s daughters. (Pounds/High Value)  FAT ........Fat predicts differences in the depth of backfat measured between the
                                                               12th and 13th ribs. (Inches/Low Value)
        HPG .......Heifer Pregnancy predicts differences in the percent of daughters
        who are able to conceive and calve at 2 years of age following exposure to
        breeding. (Percent/High Value)







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