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Cow factors and udder health indicators
Transcript of Cow factors and udder health indicators
Karin Persson Waller
Torben Werner Bennedsgaard
Financial support from the Swedish Farmer’s Foundation for Agricultural Research (Stockholm, Sweden)
All investigated inflammatory indicators are affected by cow factors
It does not seem necessary to adjust the SCC for cow factors
SCC seems the best indicator to use to find cows with subclinical mastitis
Associations between IMI and SCC, LDH, NAGase and AP
Parity and urea in milk was associated with all inflammatory indicators
Breed was associated with SCC and AP
Days in milk (DIM) was associated with LDH, NAGase and AP
Season was associated with LDH and NAGase
Lowest in October-November compared to January-April
Milk yield was associated with SCC and NAGase
Percentage of fat in milk was associated with SCC and AP
Increasing SCC and AP with increasing percentage of fat
Percentage of protein was associated with LDH
Increasing LDH with increasing percentage of protein
To investigate associations between the inflammatory indicators and
cow factors (of bacteriological negative cows )
intra-mammary infections (IMI)
To investigate the ability of the inflammatory indicators to predict IMI
In Sweden we have used a adjusted SCC:
Stage of lactation
The adjusted SCC has been used to predict the probability that a cow has infectious subclinical mastitis in one or more udder quarters – “the udder health classes”
Can increase/decrease due to other factors than infection, e.g. parity, stage of lactation, stress etc.
How does this affect the ability to find cows with an infection?
Somatic cell count (SCC)
At IMI the proportion of neutrophils can increase ≥ 90%
Lactate dehydrogenase (LDH)
Alkaline phosphatase (AP)
Where do we start?
What do we want to achieve?
Prevent spread of infectious subclinical mastitis
We have to find the cows that have infectious subclinical mastitis
How do we find them?
By bacteriological culturing/ PCR assay
By measuring inflammatory indicators to help us select cows for sampling
Ann Nyman, MSc, PhD, National Veterinary Institute
Effects of cow factors and intra-mammary infection on udder-health indicators
How does cow factors affect SCC, LDH, NAGase and AP in healthy cows?
Approximately 970 cows from 25 herds
3 consecutive samplings
Bacteriological culturing of all quarters on all occasions
One whole udder milk sample - SCC, LDH, NAGase and AP
Distribution of predicted values