Page 5 - C-B Charolais Bull and Heifer Production Sale – March 23, 2021

values to use in the index. These economic values
are then multiplied by the EPD and summed to
produce an overall index value for each animal for
the selected scenario. This index places economic
value on the various traits that are important to the
given scenario.
The AICA Terminal Sire Index is unique in that
it does not always return the same index value
unless the herd profi le and marketing scenario
remains unchanged. This gives each producer the
opportunity to customize the index by inputting
herd profi le data that may be unique to their
operation.

Remember though that this is a Terminal Sire
Index and does not indicate which sires would be
the most profi table when retaining replacement
females. Factors other than what are used in the
index are important considerations for replacement
females.
Producers also must use realistic information
when inputting your herd and marketing profi le.
To illustrate this, try changing one of the variables
in the profi le without changing any of the others.
For example, if all other profi le data is unchanged
and weaning weight is increased to an unrealistic
value of 1000 pounds the index returns the lowest
growth bulls available. This is because with the
increased weaning weight and the length of the
back grounding and feeding phases a producer
would receive huge discounts based on overweight
carcasses at harvest. One of the major benefi ts of
this index is its ability to help match genetics to
management programs.

SIRE LISTING CRITERIA

For bulls to have a Terminal Sire Index they must be
registered with the American-International Charolais
Association. Each bull must also have an EPD for
BW, WW, YW, MAT, REA, HCW, MARB and FAT.

PROGENY PROVEN SIRES: Must have sired at least
3 calves with performance data reported to AICA
within the last two years and an accuracy value of
.30 or higher.

UNPROVEN SIRES: 30 months of age or younger.

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