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169965

PHENOTYPIC CHARACTERIZATION AND MOLECULAR IDENTIFICATION OF SOME LACTIC ACID PRODUCING BACTERIA IN RAW MILK OF DIFFERENT ANIMAL SPECIES

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Last updated: 23 Jan 2023

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Abstract

A total number of 228 apparently healthy milk samples were collected from individual and bulk tank milk of cows (100 and 86 samples, respectively), goats (30) and she camel (12) for isolation of some lactic acid bacteria (LAB) especially that have coccal form. The preliminary screening LAB community at the genus level depending on the basis of morphological characteristics showed that, the isolates were differentiated into 4 groups; Enterococci, Leuconostocs, Pediococci and Streptococci with a total percentage of 61%. The highest % of LAB was recorded for Enterococcus species in the different animal species especially in camel milk (41.7%). Antibacterial activity of selected 75 LAB strains against S. aureus, S. uberis, E. coli and Yersinia enterocolotica as bovine mastitis pathogens were detected. 53 out of 75 of the selected strains showed antibacterial effect against the tested pathogens. Eighteen Enterococcus isolates have inhibitory effects on all of the tested bacteria with inhibition zone diameter ranged between 10-25 mm. Sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) was used as an aid step for identification of LAB strains. Thus the SDS-PAGE results confirmed the biochemical identification of the isolated cultures for Leuconostoc mesenteroides with a percentage of similarity (90.8%), for Pediococcus acidilactici (92.5%), for Enterococcus hirae (99.84%) and for Streptococcus thermophilus (99.89%). Representative strains of genus Enterococci that had higher antibacterial activity against mastitis pathogens were subjected to sequence-based identification. The obtained sequences of these isolates were submitted to the Gen Bank database with accession numbers KU847974 and KU847975 for E. faecium and E. hirae, respectively and showed 99% 16S rRNA sequence homology. It was concluded that raw animal milk may be a po­tential source for the isolation of probiotic LAB with antibacterial properties against mastitis pathogens that may be presented as an interesting alternative to antibiotic drugs to overcome the antibiotic resistance of mastitis pathogens as well as antibiotic residues in milk.

DOI

10.21608/avmj.2016.169965

Keywords

Key words: LAB, Raw milk, isolation, identification, Antibacterial activity, mastitis pathogens

Authors

First Name

HANAA

Last Name

ASFOUR

MiddleName

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Affiliation

Mastitis and Neonatal Diseases Department, Animal Reproduction Research Institute (ARRI), Giza, Egypt

Email

hanaaasfour@yahoo.com

City

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Orcid

0000-0001-7915-8393

First Name

INAS

Last Name

GAMAL

MiddleName

-

Affiliation

Immunobiology and Immunopharmacology Unit, Animal Reproduction Research Institute (ARRI), Giza, Egypt

Email

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Orcid

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First Name

SAMAH

Last Name

DARWISH

MiddleName

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Affiliation

Biotechnology Research Unit, Animal Reproduction Research Institute (ARRI), Giza, Egypt

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Orcid

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Volume

62

Article Issue

149

Related Issue

24319

Issue Date

2016-04-01

Receive Date

2016-03-23

Publish Date

2016-04-01

Page Start

47

Page End

59

Print ISSN

1012-5973

Online ISSN

2314-5226

Link

https://avmj.journals.ekb.eg/article_169965.html

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https://avmj.journals.ekb.eg/service?article_code=169965

Order

7

Type

Research article

Type Code

1,840

Publication Type

Journal

Publication Title

Assiut Veterinary Medical Journal

Publication Link

https://avmj.journals.ekb.eg/

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Article

Created At

23 Jan 2023