Milk microbiota of clinical mastitic cows: an etiological approach

Autor: Simone Baldini Lucheis, Anelise Salina, Sâmea Fernandes Joaquim, Simony Trevizan Guerra, Felipe Freitas Guimarães, Márcio Garcia Ribeiro, Vera Lúcia Mores Rall, Rodrigo Tavanelli Hernandes, Domingos da Silva Leite, Vera Cláudia Magalhães Curci, Gabriel Augusto Marques Rossi, Helio Langoni
Jazyk: English<br />Portuguese
Rok vydání: 2024
Předmět:
Zdroj: Ciência Rural, Vol 55, Iss 2 (2024)
Druh dokumentu: article
ISSN: 1678-4596
0103-8478
DOI: 10.1590/0103-8478cr20230555
Popis: ABSTRACT: Bovine mastitis is the most impacting disease of dairy industry, and it is characterized by a complexity of causal agents, which have revealed a geographical variation among regions and countries. The mastitis-related pathogens have been traditionally classified as contagious or environmental, based on habits of the microorganisms and transmission routes. Besides, the severity of mammary infections has been associated with the virulence of the pathogens, and immune and nutritional status of the hosts. Considering this scenario, we investigated the etiological pattern, clinical severity scores, and days in milk (DIM) data in 4,273 clinical cases of bovine mastitis among ten large-dairy farms located in Brazil. Streptococcus dysgalactiae (283/4,273 = 6.6%), Escherichia coli (190/4,273 = 4.4%), Prototheca spp. (112/4,273 = 2.6%), and Streptococcus uberis (95/4,273 = 2.2%) were the predominant pathogens isolated. Among 4,273 clinical cases, clinical severity score was available in 43.8% (1,871/4,273) animals. From these, 69.8% (1,306/1,871), 27.3% (510/1,871), and 2.9% (55/1,871) were scored as mild, moderate, and severe, respectively. Pathogens were observed mainly in samples obtained during the first 100 days in milk, and clinical severity scored mainly as mild. Our results contributed to the etiological identification, clinical severity scoring, and milking aspects of mastitic cows in dairy farms with a history of clinical mammary infections.
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