Effects of Dietary Supplemental Vitamin E and Chromium on Egg Production, Egg Quality and Blood Parameters of Laying Hens under Thermoneutral or Heat Stressed Conditions


  • H. Mohammadi Department of Agriculture, Payame Noor University, Tehran, Iran
  • M. Karami Department of Animal Science, College of Agriculture and Natural Resources, Razi University, Kermanshah, Iran
  • M. Torki Department of Animal Science, College of Agriculture and Natural Resources, Razi University, Kermanshah, Iran
چکیده مقاله:

The effects of dietary supplemental vitamin E (VE) and chromium (Cr) on egg production (EP), egg quality, serum concentrations of Cr and insulin and activity of glutathione peroxidase (GSH-Px) were evaluated in Lohmann LSL-Lite laying hens reared under thermoneutral or heat stress (HS) conditions. A total of 144 laying hens were distributed in 24 cages and assigned to feed four diets including two levels (0 and 200 mg/kg) of VE and two levels (0 and 1200 μg/kg) of Cr in a 2 × 2 factorial arrangement with six replicates. The daily temperature in the house was maintained at 17 ˚C for 10 weeks (30-40 wks of age) and afterward (41-45 wks of age) increased instantly to 32 ˚C to simulate HS. Decreased feed intake was observed in hens fed the Cr-supplemented diet during HS (P0.05). Increased feed conversion ratio (FCR) and decreased yolk weight and shell thickness were detected in hens fed the VE-supplemental diet before HS (P

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عنوان ژورنال

دوره 8  شماره 2

صفحات  295- 303

تاریخ انتشار 2018-06-01

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