Effects of dietary combination of chromium and biotin on egg production, serum metabolites, and egg yolk mineral and cholesterol concentrations in heat-distressed laying quails |
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Authors: | K Sahin M Onderci N Sahin M F Gursu J Vijaya O Kucuk |
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Institution: | (1) Department of Animal Nutrition, Faculty of Veterinary Science, Firat University, Elazig, Turkey;(2) Veterinary Control and Research Institute, Firat University, Elazig, Turkey;(3) Department of Biochemistry, School of Medicine, Firat University, Elazig, Turkey;(4) Nutrition 21, Inc, 4 Manhattanville Road, Suite 202, Purchase, NY;(5) Karmanos Cancer Institute, Wayne State University, Detroit, MI |
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Abstract: | Chromium picolinate is used in the poultry diet because of its antistress effects in addition to the fact that the requirement
for it is increased during stress. This study was conducted to determine if the negative effects of high ambient temperature
(34°C) on egg production, egg quality, antioxidant status, and cholesterol and mineral content of egg yolk could be alleviated
by combination of chromium picolinate and biotin (0.6/2.0; Diachrome™, as formulated by Nutrition 21 Inc.), in laying Japanese quails (Coturnix coturnix japanica), Quails (n=240; 50 d old) were divided into 8 groups, 30 birds per group. The quails were fed either a basal diet or the basal diet
supplemented with 2, 4, or 8 mg of Diachrome/kg diet. Birds were kept at 22°C and 53% relative humidity (RH). At 14 wk of
age, the thermoneutral (TN) group remained in the same temperature as at the beginning of experiment, whereas the heat stress
(HS) group was kept in an environment-controlled room (34°C and 41% RH) for 3 wk. Heat exposure decreased performance when
the basal diet was fed (p=0.001). Diachrome supplementation at 4 and 8 mg/kg diet, increased feed intake (p=0.05), egg production (p=0.05), feed efficiency (p=0.01), egg weight (p=0.05), and Haugh unit (p=0.01) in quails reared under heat stress conditions. Heat exposure increased concentrations of serum malondialdehyde (MDA)
(p=0.001), glucose, and cholesterol (p=0.01), which were elevated by supplemental Diachrome (p≤0.05). Egg yolk Cr, Zn, and Fe (p=0.01) concentrations increased linearly, whereas MDA and cholesterol concentrations decreased (p=0.05) as dietary Diachrome supplementation increased in HS groups. Similar effects of supplementation on serum levels of
glucose and cholesterol (p=0.05) and egg yolk concentrations of cholesterol (p=0.05) and Cr (p=0.01) were observed in TN groups. No significant differences in other values were observed in the TN groups. Results of the
present study suggest that supplementation with Diachrome protects the quail by reducing the negative effects of heat stress. |
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Keywords: | Chromium biotin heat stress egg cholesterol MDA quails |
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