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- W3013648174 abstract "The objective of this study was to evaluate the association between ketonemia and serum paraoxonase-1 (PON1), malondialdehyde (MDA), and other blood components in tail and mammary veins of dairy cows. Forty-two Holstein dairy cows with decreased feed intake were divided into HIGH (≥ 1.2 mM; n = 31) and LOW (< 1.2 mM; n = 11) groups based on the β-hydroxybutyrate concentration in plasma collected from the tail vein. The HIGH group had a significantly greater plasma non-esterified fatty acid (NEFA) concentration, but significantly lower serum PON1 activity and phospholipid concentration, and a tendency to have a lower cholesterol ester concentration than the LOW group. Serum PON1 activity was not correlated with the MDA concentration but was positively correlated with serum concentrations of cholesterol esters and phospholipids, and negatively correlated with the plasma NEFA concentration. These results suggest that serum PON1 activity is reduced by hyperketonemia and the relevance of PON1 to MDA seems to not be direct, though it is involved.L’objectif de la présente étude était d’évaluer l’association entre l’acétonémie et la paraoxonase-1 (PON1), le malondialdéhyde (MDA), et d’autres composés du sang dans les veines caudale et mammaire de vaches laitières. Quarante-deux vaches laitières de race Holstein présentant une diminution de l’ingestion d’aliments furent divisées en groupes ÉLEVÉ (≥ 1,2 mM; n = 31) et BAS (< 1,2 mM; n = 11) basés sur la concentration de β-hydroxybutyrate de plasma prélevé de la veine caudale. Le groupe ÉLEVÉ avait une concentration plasmatique significativement plus grande d’acides gras non-estérifiés (NEFA), mais le sérum présentait une activité PON1 et une concentration de phospholipides significativement réduite, et une tendance à avoir une concentration d’esters de cholestérol plus faible que le groupe BAS. L’activité de PON1 sérique n’était pas corrélée avec la concentration de MDA mais était corrélée positivement avec les concentrations sériques d’esters de cholestérol et de phospholipides, et corrélée négativement avec la concentration plasmatique de NEFA. Ces résultats suggèrent que l’activité de PON1 sérique est réduite par l’hypercétonémie et la pertinence de PON1 envers MDA ne semble pas être directe, bien qu’elle semble impliquée.(Traduit par Docteur Serge Messier)." @default.
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- W3013648174 date "2020-01-01" @default.
- W3013648174 modified "2023-09-27" @default.
- W3013648174 title "Serum paraoxonase-1 activity in tail and mammary veins of ketotic dairy cows." @default.
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