DEKALB, HI. You’ve walked
I/our fields and viewed hybrid
demonstration plots. Now, you are
preparing to harvest your crop.
Before you’re done, you’ll begin
receiving reports of hybrid per
formance from seed companies
and others. How do you improve
your fanning profits by basing
seed purchases on demonstration
plot results?
Demonstration plots are
generally fairly large with a single
What causes nipple necrosis?
YORK Nipple necrosis, the
scabby formation sometimes seen
on the nipples of newborn pigs, was
recently investigated by resear
chers at Washington State
University. The study was con
ducted to determine if the in
cidence of nipple necrosis was
affected by alfalfa in the diet and
floor type.
t Beginning on day 80 of gestation,
pedal diets were fed containing
either 0 or 50 percent alfalfa. Sows
farrowed in crates containing one
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Plot results can improve hybrid selection
machine-planted, machine-harve
sted .strip representing -each
hybrid. They usually are not
replicated. The first thing to
remember about the results is that
each reflects the influence of the
high number of variables:
Was the field uniformly tilled?
Was even application of
plowdown fertilizers, nitrogen and
pesticides achieved? Was weed
control equally good across the
entire plot area?
of three floor types: concrete slats,
flattened expanded metal with
wooden center sections, or steel
slats with wooden center sections.
there were about 8 percent more
pigs having necrotic nipples
among those from sows fed no
alfalfa.' Also, concrete slats led to
necrotic nipples in 20.7 percent of
the pigs (about 10 percent more
than with the expanded metal
floor).
The scientists also found that
pigs with swollen or necrotic
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Was a check hybrid used?
Are harvest populations
equivalent and is plant spacing
similar for all hybrids? Are
hybrids of the same maturity being
compared?
Was tfaecombine adjusted to do a
better job of harvesting one hybrid
than another?
This list could go on and on.
However, the point is that a single
nipples generally had higher levels
of circulating estrogen. This
corresponded to higher levels of
estrogen in the blood of sows
receiving no alfalfa. M
m
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demonstration plot is not reliable
enough to give you the information
needed to make hybrid buying
decisions. Even a single research
plot with replications, ran
domization and statistical tests for
validity should not be the only
basis for hybrid selection.
Seek records for a two-year
period (or longer) from several
locations that represent farming
practices, soil types, and climate
similarto your farm.
When reviewing such data,
consider how hybrids compared
head-to-head in each plot for each
year as well as the multi-year
average for yield and moisture.
The average yield for two hybrids
may not differ much, but one may
have outyielded the other IS or
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more times out of 20. Thus, you
may be choosing between a con
sistent performer and a “boom or
bust” hybrid that’s occasionally
outstanding, but often disap
pointing.
In selecting hybrids, search for
top performers in two and
preferably, three maturities. Try
listing hybrids from lowest to
highest grain moisture. Then look
for the best performers in each
different maturity group.
Plots require a lot of effort to
plant, harvest and publish results.
Interpreting the results also
requires considerable effort if they
are to be meaningful. Many milti
million dollar decisions are based
in part on demonstration plot
results.