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  • Title: Stability of plasma metabolites and hormones in lactating dairy cows.
    Author: Phillips RW, Athanasiou VN.
    Journal: Am J Vet Res; 1978 Jun; 39(6):949-52. PubMed ID: 666089.
    Abstract:
    Plasma concentration stability of glucose, free fatty acids, ketone bodies, growth hormone, insulin were determined in lactating dairy cows. Concentrations of these metabolites and hormones were measured during a 36- to 48-hour period in 3 normal, mature dairy cows in the 2nd month of lactation. Samples were taken at 30-minute intervals; also, intensive sampling (every 10 minutes) was done at varying times in relation to feeding and milking. Of the 5 components measured, glucose concentration was the most stable, easiest to assay, and most reliable for use as a diagnostic aid in assessing metabolic carbohydrate disturbances in dairy cattle.
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