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Assessment of Lactate Dehydrogenase, Alkaline Phosphatase and Aspartate Aminotransferase Activities in Cow’s Milk as an Indicator of Subclinical Mastitis

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Abstract

This study examined the activities of lactate dehydrogenase (LDH), alkaline phosphatase (ALP) and aspartate aminotransferase (AST) in the milk of lactating Holstein cows in association with subclinical mastitis (SCM). A total of 94 milk samples were collected from 58 lactating dairy cows representing stages of lactation from the second to the tenth week after calving. Those which were classified as positive by California mastitis test (CMT) were deemed to have subclinical mastitis. All the milk samples were skimmed by centrifugation at 10 000g at 0°C and were used for enzyme activities estimations. The mean activities of LDH and ALP were higher in the milk from udders with SCM than in the milk from healthy udders p < 0.05). There were no significant differences in AST values. The maximum agreement rates between the CMT results and LDH and ALP values were seen at thresholds of >180 IU/L and >40 IU/L respectively (κ values 0.65 and 0.79, respectively). However, the sensitivity of the tests for identifying SCM at these thresholds was higher for ALP (96.4%) than for LDH (68.5%). In this study, LDH and ALP tests were standardized for cow's milk and results showed that only the ALP test was reliable in the early diagnosis of subclinical mastitis.

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Abbreviations

LDH:

lactate dehydrogenase

ALP:

alkaline phosphatase

AST:

aspartate aminotransferase

SCM:

subclinical mastitis

CMT:

California mastitis test

SCC:

somatic cell count

PPV:

positive predictive value

NPV:

negative predictive value

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Correspondence to H. Babaei.

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Babaei, H., Mansouri-Najand, L., Molaei, M.M. et al. Assessment of Lactate Dehydrogenase, Alkaline Phosphatase and Aspartate Aminotransferase Activities in Cow’s Milk as an Indicator of Subclinical Mastitis. Vet Res Commun 31, 419–425 (2007). https://doi.org/10.1007/s11259-007-3539-x

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