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Hormonal status and regulation of glycemia in neonatal calves during the first hours of postnatal life

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Author(s): Kirovski Danijela | Lazarević M. | Stojić V. | Šamanc H. | Vujanac I. | Nedić Olgica | Masnikosa Romana

Journal: Acta Veterinaria
ISSN 0567-8315

Volume: 61;
Issue: 4;
Start page: 349;
Date: 2011;
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Keywords: glycemia | hormonal status | IGF system | neonatal calves

ABSTRACT
The aim of this study was to examine changes in some hormones concentrations in calves during the first 32 hours of neonatal life and to estimate their association with glycemia. Thyrty two Holstein breed calves were selected for the study. Blood samples were taken at 30, 60 and 90 minutes postnatal. Calves received pooled colostrum: primary colostum (1.5 L, 2 hours after birth), secondary colostrum (2 L, 14 hours after birth) and tertiary colostrum (2 L, 26 hours after birth). Blood samples were taken at hours 5, 20 and 32 of neonatal life. Concentrations of glucose, insulin, cortisol, thyroid hormones and IGF-I and abundance of IGFBP-1, IGFBP-2 and IGFBP-3 were determined in the blood serum. The T3/T4 ratio was also calculated. Calves were born hypoglycemic (glycemia was 2.56±1.05 mmol/L at birth). Thereafter, glycemia significantly increased (p
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