Interpretation Of Results - DRAMINSKI 4QMAST Manual De Instrucciones

INTERPRETATION OF RESULTS

THE RESULTS SHOULD BE EVALUATED ACCORDING TO THE
FOLLOWING CRITERIA:
1. What is the numeric value of examined quarter and jaką it a
typical value for a particular cow (each cow should be evaluated
taking into account its age)?
2. How big are the differences between the quarters of a particular
cow?
Ref. 1:
Readings below 250 units:
This is a clear indication of a rapid increase in the severity of infection
as subclinical mastitis progresses to clinical states or the high risk of
passing to subclinical states of mastitis.
Readings above 300 units:
The milk sample is of high quality and is healthy. Usually the read-
outs are placed in the range 330-360 units. The incidence of
subclinical mastitis is very low. Among young milk cows (1-2
lactations) the most common readings approach the vicinity of 370-
400 units whereas the old cows will show readings at lower level of
300-320.
Readings between 300 and 250 units:
A progressively increasing incidence of subclinical infection as
readings decrease. Due to physiological differences it is extremely
difficult to define border between healthy and sick quarter.
The readings at the level of 250-300 units can be taken as normal
readings and quarters as healthy, especially when results in a
particular cow does not show higher values. However, if the sudden
drop is noticed down to 250-300 units whereas all the previous
examinations gave much higher results, i.e. over 300 units, it means
that this particular cow may be at risk of having subclinical masittis.
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Ref. 2:
The difference higher than 40-50 units between the highest
and the lowest result in milk quarters indicates the beginning
of subclinical mastitis. It is necessary to examine the cow
before each squirting systematically to see whether the non-
healthy state is progressing (i.e. whether the readings drop).
Additionally it is necessary to follow the hygienic regulations
and undertake special care before and after squirting.
EXAMPLES OF RESULT INTERPRETATION:
young cow, 2nd lactation
all quarters gave readings over 300 units, but the difference between
quarter C and A suggest that that the former may be at risk of
subclinical mastitis. It is necessary to continue examining the cow.
quarter A = 370
quarter B = 380
quarter C = 310 (the difference is 70 between maximum (qrt. B)
quarter D = 370
middle-aged cow, 5th lactation
the results suggest that one of the quarters (D) may be endangered
by the subclinical mastitis. Preventive actions should be undertaken
promptly and the cow put under vigilance.
quarter A = 340
quarter B = 350
quarter C = 350
quarter D = 260 (result below 300, the difference 90 units to the
maximum (qrt. B and C)
old cow, 9th lactation
one of the quarters (B) the reading was below 300 units, but it is
common among the cows of that age.
quarter A = 310
quarter B =290 (result below 300 but the maximum difference
only 20 units)
quarter C = 300
quarter D = 300
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