Mastitis pathogens and their antimicrobial susceptibility in early lactating dairy cows

Trajchev, Metodija and Nakov, Dimitar and Petrovska, Milena and Jankoska, Gordana (2017) Mastitis pathogens and their antimicrobial susceptibility in early lactating dairy cows. The Journal "Agriculture and Forestry", 63 (1). ISSN 0554-5579

Text 32. 20170330-05 Trajchev et al..pdf - Published Version Download (408kB)

Abstract

A two years cross-sectional longitudinal survey was carried out for determination of udder pathogens prevalence and their antimicrobial profile in one commercial dairy farm. Dairy cows were selected in relation to date of calving and period of early lactation in order to minimize environmental impact.A udder quarters milk samples were obtained from totally 211 black-white dairy cows. The quarter milk-samples were screening using the California Mastitis Test (CMT) for detection of abnormal milk secretion (AMS) and from quarters
with AMS were obtained milk-samples for microbiological examination in order to detect intramammary infections (IMI). The milk-samples were obtained in two periods: period from beginning of lactation until 21st day in lactation and period from 22nd to 42nd day in lactation. The prevalence of IMI in period from beginning of lactation until 21st day in lactation and period from 22nd to 42nd day in lactation was 4.03% and 4.38%, respectively. Based on CMT, there was found
totally 162 udder quarters with AMS. From these quarters, the overall proportion of microbiological negative quarters was 56.17% and mastitis pathogens were isolated from 43.83% of udder quarters, from which the dominant mastitis
pathogens were: Streptococcus agalactiae (19.14%), Enterococcus spp. (8.02%), Candida non-albicans (6.79%), Staphylococcus aureus (6.17%), Escherichia coli(1.85%), Aspergilus niger (1.23%) and Pseudomonas aeruginosa (0.62%). The results indicated that contagious pathogens were the most common patogens of IMI in early lactation. There was significant difference in the prevalence of
intramammary infection (χ2=35.136, df=1, p<0.001) when comparing the front and rear udder quarters. The isolated bacteria were examined for determination of
susceptibility to 27 most used antimicrobial agents for mastitis treatment. The most resistant strain was Staphylococcus aureus.
Keywords: dairy cow, intramammary infection, lactation

Item Type:	Article
Impact Factor Value:	0.654
Subjects:	Agricultural Sciences > Veterinary science
Divisions:	Faculty of Agriculture
Depositing User:	Dimitar Nakov
Date Deposited:	18 Nov 2022 11:21
Last Modified:	18 Nov 2022 11:33
URI:	https://eprints.ugd.edu.mk/id/eprint/30137

Actions (login required)

View Item