Quiz 2 Flashcards
To qualify for organic, cattle must have access to pasture for a minimum of?
120d/year (unless the growing season is longer…they should have access throughout the growing season)
Which type of cattle are not required to have >30% of the DMI come from pasture?
slaughter stock in last 1/5 of life (<120d)
In which type of organic cattle are parasiticides prohibited?
cattle that will become organic MEAT
Due to the increased grazing requirements, organic meat may contain higher concentrations of?
Phytoestrogens
1 reason for culling on dairy farms?
reproduction
Name the 4 inherent barriers to infection for the udder
1) teat sphincter
2) Furstenburg’s rosette
3) keratin plug
4) milk components (PMNs)
Name the 5 most common isolates from cow mastitis
1) Strep agalactia
2) Staph aureus
3) Strep uberis
4) Strep dysgalactia
5) E. coli
Of the common mastitis pathogens, which are considered CUPs
1) Strep agalactia
2) Staph aureus
*also C. bovis & Mycoplasma
Though most CUPs cause subclinical mastitis, which one is commonly assoc. with CLINICAL cases of mastitis?
Mycoplasma
Which CUP can be difficult to detect due to intermittent shedding of low bacterial numbers
Staph aureus
For which CUP are antibiotics ineffective? Why?
Mycoplasma–lack of cell wall
Which CUP is assoc. with the highest bacterial counts, making bulk tank culturing an effective diagnostic tool?
Strep agalactia
High coliform counts in the bulk tank correlate with?
wet milking
*NOT with coliform mastitis
What mastitis organism would you expect to find in cows with unhealthy/damaged teats
Coagulase negative Staph organisms
**can also be found on hands of milkers
Which soil-borne organism can cause gangrenous changes if it infects the udder?
Bacillus cereus
Coliform mastitis has a higher incidence in herds with a (LOW/HIGH) SCC (pick one)
LOW
lack of neutrophils could be predisposing?
What are the 3 areas tested for milk quality
1) SCC
2) bacterial counts
3) adulterants
What is the official test/gold standard for determination of BTSCC (as far as degrading a producer from market)
Direct microscopic cell count
A cow-side test that checks milk from each quarter for SCC by adding a reagent that clumps the DNA
California mastitis test
What is the main goal of monitoring SCC?
Prevention
Name the 2 most common reasons a bulk tank may have elevated SPC?
1) inadequately cleaned equipment
2) inadequate cooling
Though the regulatory limit for SPC is < 100,000 and reasonable on-farm goal would be much lower at about ______?
< 5,000 CFU/ml
If you culture a high PI count but your SPC was not high, what organism should you expect is contaminating the milk?
Why do we care?
Pseudomonas
elevated numbers are assoc. with decreased shelf-life (NOT a public health concern)
Which spp. of bacteria is most commonly assoc. with elevated LPS counts?
Bacillus
