Vet Med - Czech, 2002, 47(4):110-116 | DOI: 10.17221/5813-VETMED

Optimal dietary concentration of vitamin E for alleviating the effect of heat stress on performance, thyroid status, ACTH and some serum metabolite and mineral concentrations in broilers

K. Sahin, O. Kucuk, N. Sahin, M. F Gursu
1 Department of Animal Nutrition, Veterinary Faculty, University of Firat, Elazig, Turkey
2 Veterinary Control and Research Institute of Ministry of Agriculture, Elazig, Turkey
3 Department of Biochemistry, Scholl of Medicine, University of Firat, Elazig, Turkey

An experiment utilizing Cobb-500 male broilers was conducted to evaluate the effects of vitamin E (d1--to- copheryl acetate) supplementation at various concentrations (0, 62.5, 125, 250, or 500 mg/kg of diet) on performance and serum concentrations of Triiodothyronine (T3), Thyroxin (T4), Adrenocorticotropine Hormone (ACTH), and some metabolites and minerals in broilers reared under heat stress (32°C). One day-old 150 male broilers were randomly assigned to 5 treatment groups, 3 replicates of 10 birds each. The birds received either a basal diet or basal diet supplemented with vitamin E at 62.5, 125, 250, or 500 mg/kg of diet. Increased supplemental vitamin E linearly increased feed intake (P = 0.01), live weight gain (P = 0.01), and improved feed efficiency linearly (P = 0.001). Increasing dietary vitamin E supplementation also resulted in linear increases in serum T3 and T4 concentrations (P = 0.01) but, linear decreases in ACTH concentration (P = 0.01). Serum glucose, uric acid, triglycerides, and cholesterol concentrations decreased linearly (P = 0.001) while, protein and albumin concentrations increased linearly (P = 0.001) when dietary vitamin E supplementation increased. Serum activities of Serum Glutamic Oxalate Transaminase (SGOT) and Serum Glutamic Pyruvate Transaminase (SGPT) were not influenced by dietary vitamin E supplementation (P > 0.10). However, serum activity of Alkaline Phosphatase (AP) increased linearly (P = 0.001) with increasing dietary vitamin E supplementation. Increasing dietary vitamin E supplementation also caused linear increases (P = 0.001) in serum concentrations of Ca and P. Results of the present study conclude that a 250 mg/kg of vitamin E provides an optimal performance in broiler chicks reared under heat stress, and vitamin E supplementation at such a level can be considered as a protective management practice in a broiler diet, reducing the negative effects of heat stress.

Keywords: thyroxin; triiodothyronine; chicken, vitamin E; nutrition; heat stress

Published: April 30, 2002  Show citation

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Sahin K, Kucuk O, Sahin N, Gursu MF. Optimal dietary concentration of vitamin E for alleviating the effect of heat stress on performance, thyroid status, ACTH and some serum metabolite and mineral concentrations in broilers. Vet Med - Czech. 2002;47(4):110-116. doi: 10.17221/5813-VETMED.
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