BRATTLEBORO, VT - The
Board of Directors of the Holstein
Association recently approved
changes in methods of calculating
two basic breeding tools to im
prove genetic ranking of cows and
bulls; the Total Performance
Index (TPI) and the Predicted
Difference for Type (PDT).
The Board endorsed a recom
mendation of the Genetic Ad
vancement Committee to im
plement a new TPI formula based
on protein and fat yields, plus type,
m a 2:2:1 ratio. New TPIs using
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USDA’a quarterly hogs and pigs report is due out December 23.
Although current cash prices seem relatively good, this report
could indicate breeding herd expansion is taking place on farms.
This can lead to lower markets during summer and fall 1986.
Sound marketing strategy would be to take advantage of
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marketing.
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Ron Manley
717-761-2740
Holstein Assn, adopts new ranking formula
this formula will be reported on
animals as a result of the sire
summary run of July, 1986.
The new TPI rankings will
realign genetic values to reflect
the demands of domestic and in
ternational markets. In these
markets, there has been a shift
from fluid milk pricing to com
ponent yield pricing. This, along
with an Increase in the numbers of
dairymen on protein testing
programs, indicated the need for a
change in the calculation of animal
total performance indexes to help
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Holstein dairymen compete in the
marketplace.
The Total Performance Index,
introduced by the Holstein
Association in 1976, has found
broad acceptance among
dairymen as a primary screening
tool for sire and cow selection. TPI
provides a single industry stan
dard for uniform comparison of
animals across a wide range of
management and economic
conditions.
TPI values are calculated from
production and type trait indexes
WliWVirwiWPi
Western PA
Dwight Allshouse
412-353-9160
State Office
Ken Hopkins or
Mike Orndorf
717-761-2740
Lancaster Farming, Saturday, December 14,1985-AI9
on registered animals and are
listed in the performance files of
the Association.
Holstein Association’s Board of
Directors approved the use of first
record classification scores
(closest to 30 months of age) in the
BLUP-PDT evaluation procedures
for the July 1986 sire summary
run. Currently, PDTs are based on
cows’ most recent classification
scores. BLUP is a statistical
procedure which permits the
ranking of bulls for transmitting
ability of functional type, taking
into account genetic trend and the
genetic level of herdmates.
Research conducted by the
Holstein Association, in
cooperation with the University of
Wisconsin, shows first lactation
classification scores are a better
standard of comparison.
Research results demonstrated
a dramatic improvement in the
ability of pedigree indexes, based
on first records, to predict the
actual PDTs of bulls. Researchers,
however, recognized the im
portance of durability
measurements based on in
formation collected later in the
cow’s life. While first records do
not measure an animal’s
longevity, and early estimate of
conformation may be useful in
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predicting the durability of a bull’s
daughter. Studies are being con
ducted to. develop a measure of
durability.
A high percentage of breeding
and genetic decisions is currently
made on first lactation in
formation, i.e., whether a bull
should go into A.I. service. Last
records tend to compare relatively
unselected younger cows with
highly selected older cows. Con
sequently, the most recent
classification records tend to favor
older bulls, bias downward young
bulls and inhibit the estimate of
genetic trend for final score.
Action by the Holstein
Association Board to improve
PDTs and TPIs should help
breeders achieve higher success
with genetics in their herds. The
use of first lactation classification
scores in PDT calculations is
expected to stabilize bull proofs,
enhance herdmate comparisons
and improve accuracy of proofs on
young sires. Revision of the TPI
formula, to include component
yields, will more nearly reflect the
national breeding goals of the
industry. In the end, these im
proved breeding tools will give
dairymen the means to achieve
greater profitability of their
animals.
(717) 274-5333
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