I Livestock Notes |
Initial Backfat Affects
Feedlot Performance Of Steers
Researchers at Kansas Stale
University recently showed that
for steers to reach the same degree
of outside fat, both final weight
and initial backfat must be consid
ered. The study compared three
groups of steers that averaged 650
pounds at the start, but differed in
initial backfat by .1 inch. Th'e cat
tle were fed either a growing ra
tion (mostly silage) or put on full
feed.
Results showed that steers with
the highest level of initial fat re
sponded differently to the growing
ration than those with less fat.
Their final weight at .4 inch of rib
fat was 1,100 to 1,130, while those
with medium (.2 inch) and low (.1
inch) of initial fat were 100 and
200 pounds heavier, respectively.
Further, high initial fat was related
to lower final weight for full fed
steers (1,110 pounds vs. 1,163
pounds). Those fed growing diets
—then full-fed to finish—requir
ed more days on feed since they
had lower average daily gains.
The percentage reaching choice
It’s What’s Inside That Counts!
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quality grade did not differ.
Steers fed growing diets before
being full-fed with .1 to .2 inch of
initial fat did not differ in their fin
al weight at .4 inch of rib fat, com
pared to steers full-fed for the en
tire period. This indicates final
weight was not affected by feed
ing regime to a fat-constant end
point in this group. Economics,
then, would dictate that feeders
should consider a wide range of
feeding strategies for feeder steers
with low initial backfat. The price
of feed energy from several sourc
es, including a growing ration
high in forages, would be an im
portant factor for thinner, less con
ditioned feeder steers.
A word of caution; This infor
mation failed to show if there was
a difference in frame size between
the groups. This is important to
know because, if the group with
higher initial fat was fatter be
cause of differences in breed,
frame, or maturity (smaller-fram
ed calves of predominantly British
breeding vs. larger-framed, con
tinental breeds), the differences in
final weight would be biased by
this factor.
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Eaey-10-uee loot
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(Continued from Pago C 4)
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Bssrlngs NEVER nssd grssslng bsesuss s
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