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    Comparison of milk microbiota between healthy and mastitic cows
    (Tubitak Scientific & Technological Research Council Turkey, 2024) Kızıl, Sibel; Aydın, Fatma Esin; Önlen Güneri, Cansu; Ülker, Ufuk; Emekdaş, Gürol; Basmacı, İbrahim; Erat, Serkan
    Mammary gland infections occur due to bacterial changes in the mammary tissue. Studies conducted in recent years have reported variations in the most common bacteria differ according to geographical locations. California mastitis test (CMT), somatic cell count (SCC), and aerobic colony count (ACC) analyses were performed on approximately 50 mL of hygienically collected raw milk samples. Raw milk was also subjected to conventional bacteriological isolation and identification. Bacterial diversity and rates in raw milk were compared through metagenome analysis. Two samples, one from healthy milk and another from subclinical milk with mastitis, were independently tested to determine whether there were differences in the percentages (%) of bacterial phylum and genera detected as a result of metagenome analysis. As a result of the conventional isolation and identification of raw milk, EscherichiaShigella, Acinetobacter, Vibrio, Streptococcus, Pseudomonas, Lactococcus, Glutamicibacter and Bacillus genera, and Enterobacteriaceae family were frequently detected, respectively. As a result of metagenome analysis, the following phyla were detected in healthy raw milk: Firmicutes and Proteobacteria (7/7), Bacteroidota (6/7), and Actinobacteriota (4/7). In raw milk with subclinical mastitis, the detected phyla were Firmicutes and Proteobacteria (27/29), Actinobacteriota (11/29), and Bacteroidota (10/29). As a result of the statistical analysis, the frequency of Bacteriodata in healthy milk samples, as well as Enhydrobacter, Enterobacteriaceae, Paenibacillus, Macrococcus, Spingobacterium, and Others, were significantly higher than the incidence in milk samples with subclinical mastitis. The only exception was observed in Escherichia-Shigella genera, where the opposite situation was evident. As a result of metagenome studies conducted on the raw milk of animals with both healthy and subclinical mastitis, significant differences were detected in some phyla and genera. The findings of our study will shed light on mastitis treatment studies by improving the microbiota.
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    Öğe
    Molecular Diagnosis Of Clostridium piliforme, The Causative Agent Of Tyzzer’s Disease In Mice And Rats
    (2024) Ülker, Ufuk; Kızıl, Sibel; Çeçen, Efsun Melike; Aydın, Elif
    Tyzzer’s disease, caused by Clostridium piliforme (C. piliforme), occurs in many species of mammals mainly in rodents, rabbits and foals is an acute, epizootic bacterial disease that can result in mortality. In our study, C. piliforme was investigated in feces samples from mice and rats in a laboratory experimental animals center by PCR technique. C. piliforme was detected in 44 (83.01%) of a total of 53 mouse feces of different ages. Of the mice found positive, 28 (73.6%) were female and 16 (88.8%) were male. C. piliforme was detected in 40 (90.9%) of a total of 44 rats feces of different ages. Of the rats found positive, 25 (96.1%) were female and 15 (83.3%) were male. C. piliforme, the causative agent of Tyzzer's disease, was detected at a high rate in mice and rats examined by the classical PCR method. When evaluated in terms of gender, 28 (73.6%) of the 40 mice positive for Tyzerr's disease were female and 16 (88.8%) were male; While 25 (96.1%) of the rats were female, 15 (83.3%) were male. As a result, Tyzerr's disease caused by C. piliforme was detected at a high rate in mice and rats by classical PCR. When evaluated by age, the disease was detected to be higher in mice at the ages of 4, 5 and 8, and in rats at the ages of 4, 5, 6 and 7. Due to the reliability of the analyses and the high risk of transmission to other animals in centers where laboratory animals are raised, Tyzzer's disease should be checked and necessary precautions should be taken to prevent the disease.