TABLE D
Variable
DHIAMUN
MUN, a.m.
MUN,
i.m.
MUN, av
PUN, blood
TABLE E
Date Milk lb Fat% Pro % DMI DIM DHIA Blood A.M. [rm,
kg day MUN MUN MUN MUN
Oct 95 8034 3.56 3.10 21.1 142 10.7
Nov 95 73.7 3.81 3.17 21.3 149 15.0 13.9
Dec 95 73.7 3.70 3.24 22.2 163 13.6 13.4 12.8 14.6
Jan 96 68.0 3.71 3.17 19.9 148 15.0 11.0 11.6 12.0
Feb 96 67.4 4.14 3.24 19.4 157 13.2 10.5 11.7 14.4
Mar 96 74,4 3.85 3.20 20.9 142 11.9 11.2 11.1 12.4
Apr 96 71.7 3.98 3.28 20.2 153 11.8 9.9 10.4 13.1
May 96 76.8 3.78 3,12 21.6 142 )1.2 i 1.3 10.4 10.5
Jun 96 69.5 3.52 3.12 17.9 ISO 12.5 12.9 12.3 13.1
Jul 96 66.7 3.54 3.09 19.2 147 12.4 • 10.1 10.1 12.0
Aug 96 63.8 3.32 3.02 18.8 159 13,6 15.7 11.9 14.8 ~
1
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No.
Mean
295
12.9
12.1
295
295
14,1
295
13.1
295
12.7
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A imvkci fai yarn milk A jwtiwi foi yam /aim
Std. Dev.
2.9
2,4
2.5
2.3
2.9
\ -
>« 'V
Minimum
Maximum
2.3
23.0
6.3
20.6
8.0
22.6
7,9
20.5
6.0
24.0
Lancaster Farming, Friday, January 10, 1997-G29
FOCUS
samples. The milk urea a.m. and
the milk urea p.m. represents sam
ples taken on sample day and
analyzed for urea concentration.
Mean value for blood urea, milk
urea a.m., milk urea p.m., and
DHIA milk urea were very
similar.
Blood levels were 91% of the
DHIA milk urea concentration
(SE=.Ol4).
The milk urea a.m. was lower
than the milk urea p.m. by about 2
mg/dl (.856xMUN p.m.)
(SE=.OO9). We would expect the
milk urea in the afternoon to be
higher than the morning due to the
fact that we feed at 11 a.m. The
average of the a.m. and the p.m.
milk MUN is 13.1; very close to
the average of DHIA milk urea of
12.9.
Standard deviations are very
similar for the different tests. The
DHIA MUN has the highest SD
2.9 compared to 2.4,2. S and to 2.9
from milk a.m. and p.m. samples
and blood tests from the clinical
laboratory.
The range in urea values is
similar across the different tests,
but note the low of 2.3 for the
DHIA MUN test and the high of
23.0. The range of the DHIA
MUN is wider than the clincial
lab’s values.
The same conclusions about a
herd concerning MUN could be
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(Continued from Page G2O)
made from any of the tests. The
mean and standard deviation are
similar for all tests.
On two of our monthly tests, the
MUNs were outside the range of
10 to 14 mg/dl for the herd. One
test was associated with higher
protein content of the ration above
what was needed and one test was
when haylage was very moldy and
feed intake dropped significantly.
Therefore, we can use these mean
values to “flag” a feeding
program.
Urea values from NBC dairy
with milk and feed intake. Milking
at S a.m. and 4 p.m. Blood col
lected at 2 p.m. Feeding at 11 a.m.
and small top-off at 4 p.m.
In Conclusion
Milk urea may be a useful test
for diagnosing herd problems and
identifying opportunities to im
prove protein supply. However,
one word of caution: milk urea
may be within acceptable ranges
of 10 to 14 but protein may still
not be adequately balanced. Final
ly, milk urea should never be
interpreted without evaluating the
entire feeding management
program.
(Dr. James Ferguson is an
associate professor at the Center
for Animal Health and Productivi
ty, New Bolton Center, of the Uni
versity of Pennsylvania.)
ED