Biotechnology in Animal Husbandry 2015 Volume 31, Issue 4, Pages: 533-541
https://doi.org/10.2298/BAH1504533G
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Electrical conductivity of milk and bacteriological findings in cows with subclinical mastitis
Galfi A. (Faculty of Agriculture, Department of Veterinary Medicine, Novi Sad)
Radinović M. (Faculty of Agriculture, Department of Veterinary Medicine, Novi Sad)
Milanov D. (Scientific Veterinary Institute „Novi Sad“, Novi Sad)
Boboš S. (Faculty of Agriculture, Department of Veterinary Medicine, Novi Sad)
Pajić M. (Faculty of Agriculture, Department of Veterinary Medicine, Novi Sad)
Savić S. (Scientific Veterinary Institute „Novi Sad“, Novi Sad)
Davidov I. (Faculty of Agriculture, Department of Veterinary Medicine, Novi Sad)
Intramammary infections change the composition of milk and increase
electrical conductivity of milk and decrease milk electrical resistance.
Electrical conductivity has been used to detect mastitis during last four
decades. The aim of this research was to examine the reliability of the milk
electrical conductivity measuring in detection of subclinical mastitis. The
experiment was conducted on a dairy farm of Holstein-Friesian breed. A total
of 113 quarter milk samples were examined, 55 samples from cows in first
stage of lactation and 58 from cows in third stage of lactation. Electrical
conductivity (EC) of milk samples was detected by Hand-held EC meter
(Draminski mastitis detector). Quarter milk samples for bacteriological
analysis were taken aseptically during the morning milking in sterile test
tubes. Bacteria growth was not detected in 60 quarter milk samples (53.1%),
while in the other 53 samples bacteria was found (46.9%). The most common
isolated bacteria in first and third stage of lactation was Corynebacterium
spp. (38.9%) and coagulase - negative staphylococci (3.54%). High quality and
healthy milk with Draminski mastitis detector was observed in 59.29% of the
samples (67/113). Cows with mastitis may not always show an increased EC of
milk from the infected quarter. Electrical conductivity of milk can give
useful informations about udder health status, but hand-held EC meters, such
as Draminski mastitis detector, cannot be used alone in diagnosis of
subclinical mastitis.
Keywords: electrical conductivity, Draminski mastitis detector, subclinical mastitis, cow
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