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C. Bovis Increases
Somatic Cell Counts
ARLINGTON, VA Minor
mastitis pathogens cause “slight”
increases in the somatic cell count
when they infect the udder.
Corynebacterium bovis is one of
these “minor” pathogens. The
exact source of C. bovis is not
known, but C. bovis is very infec
tious and once a few quarters
become infected, it can spread
rapidly from infected quarters to
uninfected ones.
No research data is available
concerning effects of C. bovis on
milk production and milk quality.
Somatic cell counts of uninfected
quarters may double when
infected with this minor pathogen.
Increases from 150,000 to
300,000 cells per milliliter are
common. C. bovis rarely is iso
lated from quarters with clinical
mastitis.
The greatest concern is quarters
infected with C. bovis are more
susceptible to infection with
Streptococcus agalactiae and
nonagalactiae streptococci than
uninfected ones. These major
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Mastitis To Determine Correct Treatment
mastitis pathogens can cause a
dramatic drop in milk production
and quality.
Prevention of C. bovis infec
tions depends on effective udder
hygiene - premilking udder prepa
ration and postmilking teat dip
ping. Dry cow therapy eliminates
most C. bovis infections. The pre
valence of C. bovis is low in herds
that practice teat dipping and dry
cow therapy.
Incidence of C. bovis infection
increases from calving throughout
lactation in herds that have inef
fective udder hygiene programs.
Intramammary therapy of infected
cows during lactation is not
recommended because there is no
economic advantage. It is more
advantageous to dry-treat infected
cows. Eradication of C. bovis is
highly probable in well-managed
herds under a rigid mastitis con
trol program.
No Effective Treatment
For Mycoplasma
Mycoplasma are a special kind
of bacteria causing mastitis.
Mycoplasma bovis and several
other mycoplasma are involved.
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C. M. HIGH CO.
320 King St
Mymtown. PA 170C7
Ptnn* 717-A44-7544
The major problems have been in
New York, California, Arizona,
and Florida, but many other areas
throughout the United States have
been affected.
Mycoplasma mastitis is usually
severe and long lasting. Often sev
eral or all quarters are involved.
Flakes and tan discoloration of
milk appear first; thereafter, ser
um separates from clots of fibrin
and cells. The udder is hard and
swollen, but the cow usually eats
well and has a normal tempera
tures. The symptoms may last for
days, weeks, or months, some
times even into the next lactation.
Milk production may return, pos
sibly reduced, in the same or next
lactation.
It spreads on infected milking
machines and hands during milk
ing, or when careless treatment
procedures are used. To prevent
the spread of mycoplasma masti
tis, an effective udder hygiene
program must be followed. Teat
dipping and other sanitary prac
tices should be carried out, and
mastitic cows should be milked
last. It is especially important that
intramammary treatment be car
ried out with great attention to
sanitation as infection is easily
carried from one cow to another
on contaminated hands, syringes,
and cannulas.
Purchased cows or heifers may
carry the infection. A good safety
precaution against introduction
from other herds is to have a bulk
tank milk sample of the herd of
origin cultured for mycoplasma
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and to culture milk of individual
animals at time of purchase or
before they enter the milking herd.
There is no effective treatment
for mycoplasma mastitis, but it
can be eradicated from herds. To
do so, follow the preventative
measures which have been listed.
Furthermore, the entire herd must
be cultured for mycoplasma.
Infected cows should be segre
gated from all others at least for
Wayne
Dairy Seminar
HONES DALE (Wayne) A
dairy cattle reproductive manage
ment seminar, sponsored by Penn
State Cooperative Extension, will
be held January 4, from 9:30 a.m.
to 3:00 p.m., in the extension
meeting room. Courthouse, Hon
esdale. Topics will include repro
ductive anatomy, examination of
reproductive tracts, prevention
and treatment of reproductive dis
eases, reproductive management
practices, and uses of hormones
and progesterone tests in repro
ductive management.
Speakers will be Dr. Michael
O’Conner, Penn State University
extension dairy specialist; Dr.
Larry Hutchinson, Penn State
extension veterinarian; and Nick
Place, Susquehanna county exten
sion agent, who formally was an
artificial breeding technician.
-The SW**
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that lactation, and be mycoplasn
free on culture before returning i
the herd. Consider culling \
bovis infected cows. Be sure nt
to buy infected replacements.
This article is one of a continu
ing series made available by ft
National Mastitis Council. Fo
additional information, contact ft
NMC, 1840 Wilson Blvd., Arling
ton, VA 22201; (703) 243-8268
County
Advanced registrations an
requested by calling Wayne Coin
ty Extension Office ai
717-253-5970. There is a $3.0(1
registration and lunch fee.
Refreshments wil 1 be provided bj
Sire Power and Eastern Milk Pro
ducers Cooperative.