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Dr. Ameer Ahmed Abd-Elhameed Megahed :: Publications:

Title:
Clinical Utility of Plasma Fructosamine Concentration as a Hypoglycemic Biomarker during Early Lactation in Dairy Cattle: Fructosamine in Dairy Cattle
Authors: Ameer Megahed; Mark W H Hiew; Peter D Constable
Year: 2018
Keywords: glycated protein; hyperketonemia; hypoglycemia.
Journal: Journal of Veterinary Internal Medicine
Volume: Not Available
Issue: Not Available
Pages: Not Available
Publisher: Not Available
Local/International: International
Paper Link:
Full paper Ameer Ahmed Abd-Elhameed Megahed_Clinical Utility of Plasma Fructosamine Concentration as a.pdf
Supplementary materials Not Available
Abstract:

Background: Plasma fructosamine concentration ([FRA]) is a widely used long term hyperglycemic biomarker in humans and dogs, but its clinical usefulness as a hypoglycemic biomarker in dairy cattle is uncertain. Objectives: To evaluate the relationship between plasma [FRA] and glucose concentration ([gluc]) as well as indices of energy balance during early lactation in dairy cattle, and to characterize the influence of plasma total protein concentration ([TP]) and albumin concentration ([albumin]) on [FRA]. Animals: Convenience sample comprising 103 periparturient Holstein-Friesian cattle. Methods: Plasma [gluc], [TP], [albumin], and other clinicopathologic indices of energy status were determined periodically from Day 4 postpartum. Body condition score (BCS) was assessed, and backfat thickness (BFT) and longissimus dorsi muscle thickness (LDT) were measured ultrasonographically. Plasma [FRA] was measured at approximately 28 days postpartum. Associations between plasma [FRA] and study variables were evaluated using Spearman's rho and stepwise forward linear regression. Statistical significance was declared at P < 0.05. Results: A positive association was detected between plasma [FRA] and mean plasma [gluc] from Days 4-28 postpartum (rs = +0.36, P < 0.001), and between plasma [FRA] and LDT (rs = +0.28, P = 0.007), BCS (rs = +0.23, P = 0.029), and BFT (rs = +0.21, P = 0.043). Multivariable regression identified a positive association between plasma [FRA] and mean plasma [gluc] and [albumin] from Days 4-28 postpartum. Correcting plasma [FRA] for [albumin] improved the association (rs = +0.46, P < 0.001) between plasma [FRA] and mean plasma [gluc]. Conclusions and clinical importance: Plasma [FRA] does not provide a clinically useful method for quantifying the magnitude of hypoglycemia or negative energy balance in dairy cows during early lactation.

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