The sale order for the IPT Bull Sale will be determined by using the Power Score.
Power Score (PS). The PS will be calculated for a bull based on “Percentile Rank” for $ Value Indexes.
Angus bulls will be ranked by % Rank for $C. Simmental- % Rank for API and TI; Hereford- % Rank for BMI & CHBI
Angus PS = (% Rank $C)
Simmental PS = (% Rank API + % Rank TI)/2
Hereford PS = (% Rank $BMI + % Rank $CHB)/2
LOWER SCORES mean a more genetically desirable bull.
PS Example. The following four Simmental bulls are representative of those sold through previous IPT Bull Sales. If we are to rank these for use in a rotational system in which females will be used as replacements in the cowherd and steers fed and sold on grid market:
Bull API TI
A 147.00 81.30
B 134.78 77.42
C 144.30 76.49
D 159.90 87.71
To calculate the PS for the bulls above, use your breed’s most current Percentile Breakdown for Non-Parent Bulls to determine percentile ranks for the various traits. The PS for these four Angus bulls based on the “Percentile Ranks from the Sire Evaluation Report – Non-Parent Bulls.”
Sire A: (21+36)/2 = 57 /2 = 28.5
Sire B: (40+52)/2 = 92/2 = 46.0
Sire C: (24+56)/2 = 80/2 = 40.0
Sire D: (8+15)/2 = 23/2 = 11.5
Thus, the order of sale for the four bulls would be…
1st – Sire D = 11.5 2nd – Sire A = 28.5 3rd – Sire C = 40.0 4th – Sire B = 46.0
Breeds without index values will still use the “6 trait Power Score”.