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Effect of peripartum dietary energy supplementation on thyroid hormones, insulin-like growth factor-i and its binding proteins in early lactation dairy cows

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Author(s): Kirovski Danijela | Sladojević Ž. | Stojić V. | Vujanac I. | Lazarević M. | Radovanović Anita | Savić Đ. | Nedić Olgica

Journal: Acta Veterinaria
ISSN 0567-8315

Volume: 62;
Issue: 4;
Start page: 403;
Date: 2012;
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Keywords: dairy cows | energy supplementation | IGF-I | IGFBPs | thyroid hormones

ABSTRACT
The objective of this study was to examine the effect of dietary energy supplementation on hormones that are considered to be the main signals of a shift in energy balance around parturition. Sixty dry cows, 15 days before calving, were chosen and divided into two eaqual groups: control and experimental (GLY). Both groups were fed a standard ration balanced in accordance to the stage of the productivereproductive cycle. Additionally, each cow in the GLY group was given glycerol based dietary energy supplementation (250 mL daily during the dry and 300 mL daily during the lactation period), which provided additional 9.30 MJ NEL during the dry and 13.95 MJ NEL during the early lactation period. Milk production was measured on days 30 and 60 of lactation and milk production was significantly higher in GLY compared to control group at day 60 of lactation (p
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