1- Milk quality lec Flashcards
What 2 bacterium are still a problem in milk?
Salmonella and campylobacter
Describe the role of the farm vet in milk quality
Promote cow cleanliness
Monitor milking routines
Monitor bactoscan/TBC
Investigate antibiotic failures
What are bulk milk collections routinely tested for?
Antibiotic residues
Name 4 sources of bacteria in the milk
Cows environment
Mastitis infection (cows udder)
Plant wash up machine
Bulk tank & cooling
T/F The use of sand in cattle houses increases bacterial count
False = Use of sand lowers bacterial count
What bacteria builds up at pasture
S. uberis
What does total bacterial count (TBC) measure?
Live bacteria & is a count of colonies growing on a plate
What is Bactoscan?
Automated count of viable & non-viable bacteria as well as those that would not grow when using the TBC method
T/F bactoscan always gives a higher count than the TBC
True
What is a coliform count a marker for?
Poor teat preparation = Environmental contamination
What does a psychrotrophic count tell us?
Organisms that grow at low temps = Highlights poor bulk tank cleaning, inadequate cooling of milk or water contamination
What does a high thermoduric count in a herd mean?
Tell us about organisms that grow at high temps = Plant cleaning issue
Raw milk is kept in a silo under 5 degrees, what problems can this cause? & How can this be helped?
Bacterial growth = Psychrotrophs
Limit waiting time & thorough cleaning between batches
List some ways in which build up of Strep. uberis can be prevented
Minimise poaching of gateways around water troughs
use bark/wood chip
rotate access
What is the impact of pre-milking teat disinfection
associated with sig reduction in strep spp and enterococcus spp counts in bulk milk
