FAC35: Mastitis Control Measures Flashcards Preview

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Flashcards in FAC35: Mastitis Control Measures Deck (20):

Which cows are most affected by summer mastitis?

Dry cows and heifers


What is the cause of summer mastitis?

Mechanical transmission via head fly

Bacter involved: 

  • Trueperella pyogenes
  • Peptostreptococcus indolicus
  • Streptococcus dysgalactiae



What does summer mastitis look like?

Udder secretion is thick, clotted, and pus

The quarter is swollen, painful, hard, and hot


Most cases lead to permanent damage of the quarter


How do you treat summer mastitis?

Parentral antibiotic injections

Intramammary antibiotics

NSAID injections

Stripping of udder to remove pus/clots

Remove from other cows in group


How do you control against summer mastitis?

Reduce exposure

Fly control

Sealing of teat canal

Dry cow therapy


What are the general principles of control?

  • Reduce reservoirs of infection (cow/udder and environment)
  • Reduce transmission/spread of infection
  • Improve defence mechanisms (Teat and udder)


What are the five/six point mastitis control plan?

  1. Regular milking machine maintenance
  2. Post-milking teat disinfection
  3. Dry cow therapy
  4. Prompt treatment and recording of clinical cases
  5. Culling of chronic cases
  6. Correct milking routine


How does the milking machine affect the development of mastitis?

  • They act as a fomite
  • They do damage to the teat end
  • The impact colonisation of the teat canal (impact forces caused by liner slip)
  • Overmilking


What are the aims of post-milking teat disinfection?

  • Removal of mastitis pathogens from teat skin
  • Removal of bacteria from teat sores
  • REduces new infection rate
  • Improving teat skin quality


What are the disadvantages of post-milking teat disinfection?

  • No effect on existing infections
  • Mainly effective versus contagious mastitis pathogens
  • May lead to teat irritation
  • Inactivated by organic matter (milk/faeces)


What are the aims of pre-milking teat disinfection?

  • Disinfect the teat to reduce contamination of the machine
  • Reduce the number of bacteria in the milk
  • Reduce the incidence of environmental mastitis


Describe the method of application for a pre-milking teat disinfection.

Foremilk > wash teat > dry> apply> allow 30 seconds contat time > wipe off to prevent residues in milk


What are the different application methods for teat disinfection?




What are the aims regarding mastitis during the dry cow period?

Treat and cure existing infections and prevent new infections (especially environmental pathogens since teat canal closure during the dry period is not very efficient)


What type of antibiotics should you use during dry cow therapy?

Most produces have good efficacy against gram positive


How should you use external teat sealants? What are their disadvantages?

Use with antibiotic dry cow therapy


  • Lack of adherence
  • Need to re-apply
  • No effect on existing infections


What are the advantages and disadvantages of internal teat sealants?


  • Very effective at preventing new environmental infections
  • Persist through dry period


  • No effect on existing infections
  • Infuse using strict asepsis
  • Residues lead to blackspot defect in cheese


What are the two different types of dry cow therapy methods?

Selective - separate cows according to ICSCC from last 3 months of lactation (under 200,000 = internal teat sealant only; over 200,000 = antibiotic dry cow tube ± internal teat sealant)

Combination - all cows get both antibiotic and internal teat sealant


When should you cull cows based on mastitis?

3+ cases of mastitis in the same quarter in a single lactation

5+ cases of mastitis in all quarters in a single lactation

ICSCC over 500,000 for three consecutive months 


What is the ideal milking order of the cows?

Freshly-calved cows

High Yielders

Medium yielders

Low yielders

High SCC cows

Cows with mastitis

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