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Flashcards in Mastitis Deck (97)
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1

How does mastitis cause money loss?

1. decreased milk production
2. costs associated with clinical disease
3. increased SCC

2

What is somatic cell count?

indicator of mammary gland inflammation
linked to decreased milk shelf life and cheese yeld

3

What is the regulatory limit of SCC in canada?

400 000 cells/ml

4

What is the limit of bacteria in canada?

50 000 bacteria/ml

5

What are the clinical signs of mastitis?

mild: abnormal milk, normal gland, systemically healthy
moderate: abnormal milk, abnormal gland, systemically healthy
severe: abnormal milk and gland, systemically sick
subclinical: increased SCC, destruction of alveoli and ducts, decreased production long term

6

What are the two groups of mastitis pathogens?

contagious, environmental

7

What is the reservoir of contagious pathogens?

mammary gland

8

When are contagious pathgens transmitted?

at milking

9

What are contagious pathogens?

S. aureus, s agalactiae, mycoplasma, corynebacterium bovis

10

What is the reservour for environmental pathogens?gens?

environment

11

What is the transmission of environmental path

between milkings

12

What are environmental pathogens?

e. coli, s uberis, other coliforms, pseudomonas

13

What are opportunistsi?

s. dysgalatiae
coagulase negative staph

14

What is the prevalence of pathogens?

s. aureus most common isolated
e. coli
s. uberis
coagulase negative staph

15

What are the features of s. aureus?

1. most common contagious pathogen
2. primarily subclinical (some clinical episodes)
3. fluctuating scc and bacterial shedding
4. gram positive coccus, coagulase and catalase positive; frequently hemolytic

16

What are the characteristics of strep agalactiae?

very RARE as it is very sensitive for antibiotics
obligate udder pathogen
subclinical mastitis with periodic flareups
gram positive coccus
catalase negative

17

What are the features of mycoplasma?

1. severe clinical mastitis
2. agalactia for rest of lactation
3. primarily contagious
4. some environmental reservoirs exsit
5. young and mature asymptomatic carriers (calves)

18

What are the features of clinical disease of mycoplasma?

the quarter stops producing milk for rest of lactation

19

How can mycoplasma access the udder?

systemically (other body sites are affected)

20

How many species of mycoplasma are there?

at least 5

21

why should you inform lab you are worried about myoplasma?

because very slow

22

What are features of corynebacterium bovis?

controlled by teat dip
primarily colonizes teat canal

23

What are features of prevention and control of mastitis?

a. decrease exposure
b. increase resistance
5 point plan
1. post-milking teat disinfection
2. blanket dry cow therapy
3. clinical mastitis therapy during lactation
4. proper milking machine maintenance
5. cull chronically infected cattle

24

What is the 5 point plan for mastitis prevention? (will ask this question)

1. post-milking teat disinfection
2. blanket dry cow therapy
3. clinical mastitis therapy duing lactation
4. proper millking machine maintenance
5. cull chronically infected cattle

25

What is the most important mastitis prevention step?

post milking teat infection

26

What are the features of post-milking teat dinsifection?

1. decreases incidence of new IMI by 50-90%
iodine
chlorhexidine
organic acids + emolients-
quarternary ammonium
sodium hypochlorite

27

what is the problem with quaternary ammonium?

inactivated by organic material

28

What is a good feature of chlorhexidine?

it works in presence of organic material

29

What is the benefit of blanket dry cow therapy?

eliminates infection
prevents infection

30

Is there a treatment for mycoplasma mastitis?

no