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- W4387394582 abstract "Mastitis is one of the most significant diseases in dairy cows and causes several economic losses. Somatic cell count (SCC) is often used as an indirect diagnostic tool for mastitis, especially for subclinical mastitis (SCM) where no symptoms or signs can be detected. Streptococcus agalactiae is one of the main causes of contagious mastitis, while Prototheca spp. is an alga inducing environmental mastitis that is not always correlated with increased milk SCC. The aim of this study was to evaluate the changes in the metabolomic profile of blood in relation to subclinical intramammary infection (sIMI) in dairy cows. In addition, differences due to the etiologic agent causing mastitis were also considered. Forty Holstein-Friesian dairy cows in mid and late lactation were enrolled in this study with a cross-sectional design. Based on the bacteriological examination of milk, the animals were divided into 3 groups: Group CTR (control group; n = 16); Group A (affected by SCM with IMI of Streptococcus agalactiae; n = 17); and Group P (affected by SCM with IMI of Prototheca spp.; n = 7). Blood samples were collected in tubes containing clot activator from jugular vein. The serum aliquot was stored until metabolomic analysis by 1H-NMR. Statistical analysis was conducted fitting a linear model with the group as fixed effect and SCC as covariate. Forty-two metabolites were identified and among them, 10 were significantly different among groups. Group A and P showed greater level of His and lactose, and lower level of acetate, Asn, and dimethylamine compared with Group CTR. Group A showed high level of Val, while the Group P showed also high level of Cit and methylguanidine, and lower level of 3-hydroxybutyrate, acetone, allantoin, carnitine, citrate, and ethanol. These metabolites were related to ruminal fermentations, energy metabolism, urea synthesis and metabolism, immune and inflammatory response, and mammary gland permeability. These results are suggestive of a systemic involvement of sIMI and that the metabolic profile of animals with SCM undergoes changes related to the etiological agent of mastitis." @default.
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- W4387394582 date "2023-10-01" @default.
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- W4387394582 title "Serum metabolome differences associated with subclinical intramammary infection caused by Streptococcus agalactiae and Prototheca spp. in multiparous dairy cows" @default.
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- W4387394582 doi "https://doi.org/10.3168/jds.2023-23851" @default.
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