Mastitis make changes in the antioxidant enzymes capacity of raw milk from dairy cows in early lactation

Nakov, Dimitar and Kuzelov, Aco and Hristov, Slavča and Belichovska, Katerina and Stankovic, Branislav and Miočinović, Jelena (2023) Mastitis make changes in the antioxidant enzymes capacity of raw milk from dairy cows in early lactation. In: 3rd international meeting agriscience & practice (ASP 2023), 19-20th April 2023, Stip, Republic of North Macedonia.

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Abstract

Early postpartum is the period when cows experience a significant increase in physiological stress levels followed by increased susceptibility to mastitis. The aim of this study was the evaluation of enzymatic antioxidant status through the activity of superoxide dismutase (SOD) and glutathione peroxidase (GPX) in milk collected from cows with mastitis in comparison with healthy cows. The two years prospective study was carried out to assess the changes occurring in the activity of antioxidant enzymes SOD and GPX in milk in two physiological periods: the period from the beginning of lactation until 21st day in lactation and the period from 22nd to 42nd day in lactation. The cows were allocated in groups regarding the season years of calving. The enzyme activity was determined in milk serum using spectrophotometric methods. The average test day milk yield of the dairy cows included in the survey ranged from 28.15±0.485 to 28.79±0.472 kg. There was a statistically significant positive correlation between the activity of SOD and GPx in milk serum. Health disorders of the mammary gland showed a statistically significant influence on GPx activity in milk serum (p<0.05), but there wasn’t a statistically significant influence on SOD activity in milk serum. The milk yield on test days had a statistically significant influence on GPx activity in milk serum. The GPx activity in milk serum can be used as a predictive biomarker for the determination of mammary gland health status in early lactation.
Keywords: glutathione peroxidase, superoxide dismutase, mastitis

Item Type:	Conference or Workshop Item (Speech)
Subjects:	Agricultural Sciences > Animal and dairy science Agricultural Sciences > Veterinary science
Divisions:	Faculty of Agriculture
Depositing User:	Dimitar Nakov
Date Deposited:	17 Nov 2023 10:23
Last Modified:	17 Nov 2023 10:23
URI:	https://eprints.ugd.edu.mk/id/eprint/32565

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