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Antioxidants supplementation to diet of Egyptian chicken under different environmental conditions 1- egg production during hot summer stress
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Abstract: The present study were performed to comparison the bio-antioxidants (bio-vitamins E, C, A and capsaicin) supplied by hot red pepper, mineral-antioxidants supplied by selenium and zinc and its combinations on performance, some physiological aspects and immune response of Egyptian laying hens (Dandarawi) exposed to a high ambient temperature (38oC) during summer months "between" May to August. Three hundred and sixty laying hens (24-wks-old) were divided into six groups, 60 birds per group. Birds were fed a basal diet (control), or the basal diet supplemented with either with 0.5 ppm selenium / kg of diet, 100 ppm zinc /kg of diet, 5 gm spice red hot pepper / kg of diet, combination of 5 gm red hot pepper plus 0.5 ppm selenium / kg of diet or combination of 5 gm red hot pepper plus 100 ppm zinc / kg of diet.
Separately or as combination, supplemental antioxidants significantly increased live weight, viability of birds, feed conversion, egg number, egg weight, egg mass and egg production% (P<0.05). Separately or combination, dietary supplementation antioxidants improved the egg quality (P<0.05) in egg weight, shell thickness and albumen %. However, egg shape index, egg shell weight %, yolk weight % and yolk index were not affected by adding antioxidants. Besides, dietary supplementations of hot pepper improved yolk colour (P<0.05) and decreased (P<0.05) Haugh unit value. Separately or as combination, supplemental antioxidants were not affected on serum concentration of plasma T3, total protein, albumin, urea, creatinine, AST and ALT. However, the globulin was increased (P<0.05) and A/G ratio was decreased (P<0.05). Supplemental red hot pepper also decreased total cholesterol, total lipids and glucose (P<0.05). In the contrarily, singly supplemental selenium increased (P<0.05) total cholesterol and total lipids. Separately or as combination, supplemental antioxidants significantly (P<0.05) increased blood indices (hemoglobin and hematocrit) as well as blood hematological parameters in RBC’s, WBC’s and WBC’s types (Heterophil (H) and Lymphocytes (L)) counts. Separately or as combination treatments improved significantly the immune status in higher HI titter of Newcastle disease (humoral immunity) or the lymphoid organs relative weights such as thymus and spleen (P<0.05). An apparent improvement of harmful bacteria (Streptococci, Salmonella and E. coli.) was decreased (P<0.05) by antioxidants supplementation. The greatest reduction was observed with diets containing hot pepper. Results of the present study show that dietary supplemental antioxidants, either separately or as combination, improved the performance, some egg quality, blood biochemical and immune status of laying hens exposed to heat stress. Such a combination of supplement can offer a potential protective management practice in preventing heat stress related losses in performance and immunity of Egyptian laying hens. It could be advisable to give more attention for importance of bio-antioxidants or their mixture on diets under hot summer stress condition.
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| Publication year |
2007
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| Pages |
703-725
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| Availability location |
معهد بحوث الانتاج الحيوانى- شارع نادى الصيد- الدقى - الجيزة
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| Availability number |
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| Organization Name |
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| City |
الاسكندرية
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| serial title |
Egyptian Poultry Science
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| Author(s) from ARC |
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| Agris Categories |
Animal physiology - Nutrition
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AGROVOC
TERMS |
Antioxidants.
Egg production.
Environmental factors.
Heat stress.
Performance testing.
Poultry.
Rations.
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| Publication Type |
Journal
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