A2B-Lancast*r Farming, Saturday, August 21, 1993
m
PEAK MILK, PERSISTENCY
AND 305-DAY PROJECTIONS
Cows make most of their profit
in the first 100 days of lactation.
Thus, it is important to get cows
off to a good start, without setting
them up for problems later in lac
tation. That’s no small task!
The goal is to get cows to peak
well and to have them hold their
peaks as long as possible, while
still maintaining enough flesh
(energy reserves) for conception
to occur.
How well a cow peaks and how
well she holds her peak produc-
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200 mi btl $122.40 |j®Bj
t '
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■s'
Since 1*52
3337 Lincoln Hwy East, Parocfce, PA 17562
WU» MawM MM
, 800-233-0331 Sat. 730-12 .
GLENN’S
UDDERINGS
By
Glenn A. Shirk
Lancaster Extension
Dairy Agent
tion affects how much milk she
will produce that lactation and
how much profit she will make.
To estimate how much milk a cow
will give in the first 305 days of
her current lactation, multiply her
peak production by 200 to 250
225 to 250 for first calf heifers and
200 to 250 for older cows. First
calf heifers don’t peak as high and
don’t drop off in production as fast
as older cows.
All of this is computed for you
automatically on your Penna. and
Raleigh DHIA reports. It appears
as estimated or projected 305 day
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i liter $122.44
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SOmlbtl. $31.70
200 ml Ml. $122.45
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DRENCH
960 ml $47.43
4*oo ml $217.95
actual records or as estimated or
projected 305 day mature equiva
lent (ME) records. For individual
cows it appears on their cow page
and on the herd’s monthly report
Age
Category
Lactation I
Lactation 2
Lactation 3 +
AvgfTotal
Similarly, their 305 day actual
estimate is about 75% of their ME
estimate. For 3rd lactation cows,
actual production is about 85% of
their estimated ME production.
The ME records arc an estimate of
what cows arc expected to pro
duce when they reach maturity at
about 6-7 years of age.
It might surprise you to see that
ME projections for first calf heif
ers are less than that of 2nd lacta
tion cows. If we are making gene
tic progress in the herd, the first
calf heifers should have the high
est ME projections, and when we
Table 1. Lactation Number, Peak Milk, 305 Day Actual
and 305 Day ME Estimates
Avg
Mil
Avg
Days
Peak
Peak
92.
102.
89.
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Herd average projections, by lac
tation number, are found on the
Herd Summary Report
Table 1 is an example that
shows average peak productions.
compare apples to apples they that we are comparing a non
probably do even in the exam- culled group of first lactation
pie in Table 1. The reason we cows to older groups of cows that
don’t see it in Table lor in Table have already had the low produc
2, or in your own DHIA records is (Turn to Pag* A 29)
Table 2. Lactation Number, Peak Milk
and 305 Day ME Projections
IST 1-ACT
2NOLACT
3 ♦ LACTS
ALL
LACTATIONS
R YOUR D
IS COMING
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actual and ME projections by lac- 1
tation number, for a sample herd
used in a Penna. DHIA records
manual. Note that peak milk for
first calf heifers is about 75% of
that of older cows.
AVQ
PEAK
TEST
DAY
PROD
NUMBER
Of
Mim
MX
MILK
COWS
PROJECTED ME
308 DAY
PROTEIN
rdable Prices
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K't
i;
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List Price
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*169.”
I