NMC Updates Teat
Dipping Testing Methods
According to the National Mas
titis Council, it has revised its pro
cedures for suggested testing of the
effectiveness of teat dips.
Although it does not test teat
dips, NMC makes recommenda
tions to business which do.
As part of a continuing program,
the council offers a monthly col
umn about mastitis. The most
recent column follows:
Postmilldng teat dipping is one
of the most effective management
practices to prevent mastitis.
Numerous products are mark
eted as teat dips, however no gov
ernment agency requires data to
establish whether a particular teat
dip effectively reduces the inci
dence of new intramammary infec
tions (efficacy data).
Several years ago, the National
Mastitis Council (NMQ deve
loped protocols to provide teat dip
manufacturers with standardized
test methods for determining teat
dip efficacy.
The protocols detail experimen
tal design; selection of herds,
cows, and quarters; preparation of
bacterial cultures; teat dipping;
sampling schedule and proce
dures; criteria for diagnosing
infections; size and duradon of
trial; and presentation of data.
Teat dip efficacy studies are
conducted under either 1) experi
mental challenge conditions, or 2)
natural exposure conditions.
“Experimental challenge stu
dies” evaluate the ability of a teat
dip to prevent new intramammary
infections when teats are experi
mentally challenged with mastitis
pathogens. Teats are experimen-
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/I FOCUS I
p
Pennsylvania
Dairy Herd* 1
Imprcmmml Awuujlion
tally challenged by immersion in a
bacterial suspension containing
specific pathogens immediately
after milking units are removed.
This protocol determines efficacy
under experimental conditions
only.
“Natural exposure studies” eva
luate the ability of a teat dip to pre
vent naturally occurring infections
in cows under normal field condi
tions. Natural exposure with a
negative control compares a new
teat dip product to no teat dipping.
Natural exposure with a positive
control compares a new teat dip
product to a teat dip of known
efficacy.
The original NMC protocols,
developed in the 1970'5, were
designated A, B, and C.
Protocol A, intended as a
screening test only, measured bac
tericidal activity of a teat dip for
mulation on teat skin.
Protocol B outlined procedures
to determine ability of a teat dip to
prevent infections under experi
mental challenge conditions.
Protocol C outlined procedures
to determine ability of a teat dip to
prevent natural infections under
normal field conditions.
NMC recently revised the proto
cols to enhance scientific merit.
Call 1-800-DHI-TEST for service or information
reflect new technologies, and
further ensure standardization of
test procedures. The previous
alphabetical name designations
(A, B, and C) were dropped and
changed to identify the investiga
tive method used.
The revisions do not invalidate
or change the meaning of previous
efficacy studies, or require that
they be redone.
NMC currently recommends the
following protocols: 1) Efficacy of
a Postmilking Teat Dip After
Experimental Exposure of Teats to
Mastitis Pathogens (compares to
former protocol B); 2) Efficacy of
a Postmilking Teat Dip Based on
Reduction of Naturally Occurring
New Intramammary Infections
(compares to former protocol C,
using a negative control); and 3)
Comparing an Experimental Post
milking Teat Dip with a Product of
Known Efficacy Based on Inci
dence of Naturally Occurring New
Intramammary Infections (com
pares to former protocol C, using a
positive control).
Note that former Protocol A is
no longer recommended.
NMC does not test or approve
teat dips - NMC only recommends
protocols for manufacturers to use
(Turn to Pago A 26)
How Does Your Herd Compare?
STATE COLLEGE (Centre Co.) —This data is pulled from Pennsyl
vania DHIA’s mainframe computer each week. It is a one-week summary
representing approximately one-fourth of the herds on test, as they are
tested monthly. t
These data are valuable from a business management standpoint and
can be used for comparing your operations to the averages from almost
1,400 herds across the state.
DHIA Averages for all herds processed between 4/22/91 and 4/29/91
Number of Herds Processed
Number of Cows Processed
Number of Cows Per Herd
Milk Per Cow (Lbs)
%-Fat
Fat Per Cow (Lbs)
%-Protein
Protein Per Cow (Lbs)
Average Days in Milk Per Cow
•Value for CWT Milk(s)
•Value for CWT Grain(s)
•Value for CWT Hay(s)
•Value for CWT Silage(s)
•Value for Pasture Per Day(s)
•Value for Milk Per Cow Per
Year(s)
•Feed Consumed Per Cow Per
Ycar(Lbs)
A; Grain
B: Hay
C: Silage'
D; Day Pasture
•Feed Cost Per Cow Per Year(s)
A; Grain
B: Hay
C: Silage
D: Pasture
•Total Feed Cost Per Cow Per
Ycar(s)
•Income Over Feed Costs Per
Year(s)
•Grain to Milk Ratio
•Feed Cost Per CWT Milk(s)
Avg Level For 1,151 SCC Herds
•Member gnonlad figures
Tubular Backbone
• Parallel linkage for greater
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• Grease zerks at wear
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• Weight distributed over tine for
better tine penetration
miLL€R
st. nnzmnz
Sll East Mam Street • St. Nazianz, Wl 54232
Phone 414-773-2121 • Fax. 414-773-2649
Represented by
CUMMINGS AND MUCKER, INC.
11l Cedar St. Box 928
Batavia, NY 14020 a 716-343-5411
Lancaster Fanning, Saturday, May 11, 1991-A25
100 Stover Dr.
1,421
82,909
58.3
17,491
3.67
643
3.19
558
316
13.35
7.84
4.26
1.55
.31
2,335
7,112
2,537
14,668
69
557
108
227
21
915
1,420
1:2.4
5.23
328,872