mastitis mastitis control - avaava.org.af/books/mastitis.pdf · 2013. 4. 25. · mastitis treatment...
TRANSCRIPT
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Mastitis
&
Mastitis Control
Dr. Myassar Alekish
2009
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What’s mastitis ?
Inflammation of one or more quarters of the
udder
Normal Inflamed
• Swelling
• pain
• warm
• redness
Mammae = breast
-itis = Latin suffix for
inflammation
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Economic Impact
Generally considered the most costly disease of
dairy cattle
Economic losses due to mastitis have been
estimated to cost dairy producers in the US $1.8
billion annually
Estimated cost $200-300/cow
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Economic Impact
The economic losses due to:
Decreased milk production
Treatment costs
Discarded milk
Death/Culling
Veterinary expenses
Cost of violative antibiotic residues
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What causes mastitis ?
Bacteria ( ~ 70%)
Yeasts and molds ( ~ 2%)
Unknown ( ~ 28%)
physical
trauma
weather extremes
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Where do these organisms come
from ?
Infected udder
Environment
bedding
soil
water
manure
Replacement animals
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Mastitis
Mastitis Classification
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Clinical
Mastitis Classification; Severity
Subclinical
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Mastitis Classification
Severity:
Clinical mastitis Abnormal milk, gland swelling, and/or illness
A reasonable goal for the incidence is ≤ 3 new cases/ 100 cows/ month
Stages of clinical mastitis M1 - Changes in the milk (Clots, flakes, clumps, or
discoloration)
M2 – Changes in the milk + udder swelling, heat or pain
M3 – Changes in the milk + udder changes + systemic illness
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Mastitis Classification
Subclinical mastitis
Normal milk with an increase in somatic cell count (SCC)
Normal SCC in uninfected cow is < 200,000 cells/mL
Common herd goals for subclinical mastitis are:
<15% of cows with SCC >250,000 cells/ml (prevalence)
< 5% of cows developing new subclinical mastitis infections per month (incidence)
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Mastitis Classification
Way of Transmission:
Contagious mastitis
Staphylococcus aureus
Streptococcus agalactiae
Mycoplasma bovis
Corynebacterium bovis
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Mastitis Classification
Environmental mastitis
Streptococci and Streptococci-like organisms
Strep. uberis, Strep. dysgalactiae, Enterococcus sp.
Coagulase-negative Staphylococci
Staph. hyicus, Staph. epidermidis, Staph. simulans
Coliforms
E.coli, Klebsiella pneumoniae, Enterbacter
Gram-negative noncoliforms
Pseudomonas sp., Serratia sp, and Proteus
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Contagious Mastitis
Spread by milking procedures, contaminated
machinery, and the hands of milkers
The primary reservoir is infected udders
Subclinical mastitis is most commonly associated
with contagious pathogens
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Staph aureus
Invasive, damage the teat and gland cisterns abscess formation scar tissue
Produces toxins, enhancing its disease-producing properties (coagulase, and hemolysins)
Intermittent shedding, very low numbers
Mainly subclinical and chronic mastitis, some acute clinical cases
Peracute form is less common; leads to gangrene of involved quarter
Diagnosis by culturing; requires serial samples
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Staph aureus
Suspected in herds with older cows, high SCC and low culling rates
Poor cure rate (20-30%)
Dry cow therapy 60% to 70% cure rate
Resistance to penicillin
Prevention
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Staph aureus
Prevention:
maintain milking machine
Proper post-dipping
Dry cow therapy
Identify Staph cows
Cull chronic cows
Segregate staph cows
Avoid purchasing Staph cows
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Streptococcus agalactiae
Obligate udder pathogen
Primarily causes subclinical mastitis
Clinical cases usually mild
Shed in high numbers
Highly elevated bulk tank SCC (>2 million cells/ml)
One infected cow in 500 will be detectable in BTM
culture
Cure rate > 90%, lactational and dry therapy
Treated easily with penicillin
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Streptococcus agalactiae
Easily eradicated through:
“Blitz” treatment or dry cow therapy
Good hygiene
Teat dipping
Prevention as for Staph aureus
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Mycoplasma bovis
Also causes pneumonia, otitis interna & arthritis in
calves
Suspected when milk samples from cows with
clinical symptoms are negative after repeated culture
using standard microbiologic methods
In clinical cases, often will initially see mastitis in
one quarter that spreads to other quarters in 1-3
days
"Coffee-grounds" appearance to milk
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Mycoplasma bovis
Rapid transmission among the herd
Shed in very high number
1 in 1,000 will cause positive BTC
Marked reduction in milk yield
Requires special media
Usually introduce to the herd via
purchased replacement animals
Resistant to antibiotic therapy
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Mycoplasma bovis
Prevention
Test before entering milking herd
Prevent new infections, rigid milking hygiene
Identify infected cows, whole herd culture
Positive cows, segregated or culled
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Corynebacterium
bovis
Causes modest increase in the SCC
Rarely causes clinical mastitis
Easily prevented by postmilking teat dip
Highly susceptible to dry cow therapy (>90%)
Credited with:
maintaining a higher than normal SCC and
increasing the resistance of the colonized quarter to
invasion by a major pathogen
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Environmental Mastitis
The primary reservoir is the dairy cow’s environment (i.e.
bedding, water, soil,… )
Associated with clinical mastitis, as well as subclinical
cases
Lack of hygiene
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Environmental Streps
Organisms found on skin, mucous membranes, and gut
50% of the infection develops at dry period
50% of infections become mild clinical infections
More subclinical mastitis
Predominant early and late lactation
Herd monitoring - culturing high SCC cows and clinicals
Lactational therapy – 50-60% cure rate
Extended treatment – higher cure rate
Dry cow therapy eliminates most existing infections
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Environmental
Streps
Prevention:
Milk clean cows
Effective pre-dipping, adequate kill time
Limit water use
Good teat end condition
Avoid overmilking:
Properly adjusted take-offs
Effective dry cow program
Teat sealants
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Coliforms
Unusual to cause persistent infection (< 2%)
Do not usually contribute much to SCC
High proportion of new infections occur during the
2 wks after drying off and the 2 wks before calving
During lactation, susceptibility is highest at calving
and decreases as lactation advances
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Coliforms
40% will become clinical
Clinical signs caused mainly by endotoxins
high temp, and inflamed quarter
watery milk with clots and pus
toxemia
May cause sever toxic mastitis (10%)
Most infections eliminated without clinical signs
Monitor by culturing milk from new clinical cases
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Coliforms
Prevention Hygiene and sanitation
Milk clean, dry udder
Vaccination
Treatment: Systemic support
NSAIDs
IV fluids
Frequent stripping Oxytocin
Antibiotics ??
J-5 vaccine
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Coagulase-Negative Staphylococci
S. hyicus, S. epidermidis:
Skin flora opportunists
Rarely cause clinical mastitis
Account for 60% of infections at first
parturition
Spontaneous cure rate in early lactation (40%)
Teat dipping, dry cow treatment
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Gram-negative noncoliforms
Pseudomonas: Commonly found in water and wet bedding
Chronic infections, no response to antibiotic therapy
Infected cows are frequently culled
Prevent by
Reducing exposure to contaminated water
Clean dry bedding
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Gram-Negative Noncoliforms
Nocardia, Candida:
Often 2ndary to unsanitary infusion
techniques or contaminated infusion products
Bacillus spp:
Has been associated with contaminated
antibiotic preparations
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Gram-Negative Noncoliforms
Serratia marcescens:
has been associated with contaminated
water supplies and contaminated teat dips
Some strains resistant to germicides
containing chlorhexidine gluconate
Respond poorly to antibiotics
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Mastitis Diagnosis
CMT
SCC reports
Strip cup
Milk conductivity
Bacterial culture
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CMT
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Mastitis Diagnosis
CMT
SCC reports
Strip cup
Milk conductivity
Bacterial culture
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CMT
Score
Visible
Reaction
SCC Range
cells/mL
Negative
Trace
1
2
3
No evidence
of precipitate
Slight precipitate
Distinct precipitate
Mixture thickens
immediately
Gel forms
0-200.000
200.000 - 500.000
500.000 – 800.000
800.000 – 5.000.000
>5.000.000
Table 1, Interpretation of California Mastitis Test (CMT)
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Mastitis Diagnosis
CMT
SCC reports
Strip cup
Milk conductivity
Bacterial culture
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Mastitis Diagnosis
CMT
SCC reports
Strip cup
Milk conductivity
Bacterial culture
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• In-line Electrical
Conductivity Tests
• Handheld Electrical
Conductivity Tests
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Mastitis Diagnosis
CMT
SCC reports
Strip cup
Milk conductivity
Bacterial culture
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Mastitis Treatment
Treat clinical cases
during lactation
Treat subclinical cases at
dry off
Dry treat all the cows
Coliforms, supportive
therapy
Use intramammary
products as primary
treatment
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Mastitis Treatment
Intramammary infusion products
1. the quick-release, short-acting types designed
specifically to treat mastitis in lactating cows
2. the slow-release, long-acting types formulated
specifically to treat subclinical mastitis in dry
cows and to prevent new infections in dry
cows: remain in the udder for 21 days
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