FAC32: Mastitis Introduction Flashcards Preview

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Flashcards in FAC32: Mastitis Introduction Deck (12):
1

What goes into the cost of a case of mastitis?

  • Milk discarded after treatment
  • Reduction in milk yield
  • Reduction in milk quality (SCC and Bactoscan)
  • Antibiotic treatment
  • Farm labour costs
  • Veterinary costs
  • Culling rates and/or deaths

2

What are the natural defences against mastitis?

Teat End Defences

  • Teat skin
  • Teat canal barrier
  • Teat canal closure (takes up to 30 mins post-milking)
  • Genetic factors

Intrinsic defence Mechanisms

  • Lactoferrin (dry period)
  • Lactoperoxidase

Inducible Defence Mechanisms

  • Inflammatory Response

Influence of Management

3

How do bacteria enter an udder?

Grown in - contagious pathogens

Forced/propelled in via milking machine, antibiotic tube, capillary action, surgical/cannula

4

What are the contagious pathogens that cause mastitis?

Staph aureus

Strep agalactiae

STrep dysgalactiae

Mycoplasma

C. bovis

5

What are the environmental pathogens that cause mastitis?

E. coli

Strep uberis

Pseudomonas aeruinosa

Bacillus cereus

Teasts and moulds

6

Why is Staph aureus so difficult to treat successfully?

  • Poor antibiotic penetration
  • Production of B-lactamase
  • Persistence of bacteria within the cell
  • Bacteria insensitive to antibiotic therapy
  • Insufficient duration of therapy

7

When do most cows get mastitis from E. coli?

Infection during dry period

8

Why is pathognomonic of mastitis caused by mycoplasma?

Hard udder with water/sandy/thick secretions 

9

What is mastitis from strep uberis associated with?

Straw yards and infection during the dry period

10

How do you determine clinical mastitis? subclincial?

Clinical - milk, udder, cow

Subclinical - Somatic cell count and bacteria

11

What are the effects of mastitis on milk constituents?

Decrease

  • Protein (including casein)
  • Lactose
  • Butterfat
  • Calcium, phosphorous
  • Stability and keeping quality
  • Taste deteriorates

Increase

  • RBC
  • WBC
  • Bacteria
  • Plasmin (degrades casein)
  • Lipase (degrades fat)
  • Sodium, chloride, pH (make bitter)

12

How do you detect mastitis?

Clinical Mastitis:

  1. Foremilking
  2. Palpation of udder
  3. Systemic illness in cow
  4. In-line mastitis detectors
  5. Milk sock/filter

Sub-clinical Mastitis:

  1. SCC
  2. Bactoscan
  3. Increases in milk conductivity
  4. Measurement of acute phase proteins in milk

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