Effects of zinc and vitamin A supplements on plasma levels of thyroid hormones, cholesterol, glucose and egg yolk cholesterol of laying hens
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Date
2001
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier Sci Ltd
Access Rights
info:eu-repo/semantics/closedAccess
Abstract
The effects of zinc and vitamin A supplementation to the diet on some blood metabolites were evaluated in Hisex brown laying hens from 56 weeks to 68 weeks of age. A total of 130 birds were divided into two main groups according to vitamin A treatment (0 and 3.44 mg retinyl acetate kg(-1) feed, respectively). each consisting of 65 hens. Hens in both of the main groups were then, divided into five zinc treatment groups (0, 25, 50, 100 and 200 mg zinc kg diet(-1) respectively) of 13 hens each. It was observed that plasma T-4.T-3 and total cholesterol levels were affected by only zinc supplementation. While 100 and 200 mg Zn kg(-1) decreased plasma T-4 level compared to control value. plasma T-3 level was reduced by 100 mg Zn kg(-1) compared to groups fed less Zn. Adding 50 and 200 mg Zn kg(-1) to the diet increased plasma total cholesterol level in the birds compared to other groups. Vitamin A, zinc. and their interaction did not influence the concentration of plasma high-density lipoprotein (HDL)-cholesterol, glucose and egg yolk cholesterol in laying hens. (C) 2001 Harcourt Publishers Ltd.
Description
Keywords
Density-Lipoprotein-Cholesterol, Lipid-Metabolism, Copper, Performance
Journal or Series
Research in Veterinary Science
WoS Q Value
Q1
Scopus Q Value
Q1
Volume
71
Issue
2
