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English :
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Nutritional manipulations to alleviate the effect of heat stress on broiler chicks
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Arabic :
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تقليل اثر الاجهاد الحرارى على دجاج اللحم عن طريق المعاملات الغذائية
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| Abstract |
Two experiments were conducted to alleviate the adverse effects of heat stres28-35.9Cº; 49-56 relative humidity" on broiler performance through two different dietary modifications. In the 1st experiment, 540 Arbor Acres broiler chicks were used in a 3 x 3 x 2 factorial design to investigate the response of broiler chicks reared under heat stress conditions. Three protein levels were used, 23 (as a control), 20 and 18 %CP in the starting period (0 - 4 weeks of age), then switched to 20 (as a control), 18 and 16 %CP in the finishing period (4 - 7 weeks), respectively. Three amino acid levels to serve as 100, 110 or 120% of NRC (1994) recommendation were administered either through feed or drinking water. Results indicated that Body weight gains of broiler chicks fed low-protein diets (20 or 18 %CP during 0-4 weeks and 18 or 16%CP during 4 -7weeks of age) supplemented with amino acids (Met, Lys and Thr) were not significantly different from those fed the 23/20 % CP-control diets. Increasing amino acid level from 100 to 110 or 120 % of the NRC (1994) requirements administered either in the feed or in the drinking water did not improve body weight gain or feed conversion of chicks. Economical efficiency (feed cost /Kg dressed weight) was better with feeding low-protein diets supplemented with amino acids in feed.
In the 2nd experiment, a total number of 330" Arbor Acres broiler chicks,(from 1-6 weeks of age) were distributed among 11 experimental treatments. The experimental treatments included feeding diet without supplementation (control) or supplemented with 1% sodium bicarbonate, 200mg/kg vitamin C, 750 mg/kg commercial electrolyte, 0.5% or 1.0010 acetic acid, and commercial enzyme mixture (1gm/kgdiet) either separately or in combinations with each others. The highest BWG and feed intake were recorded with supplementing the diet with mixture of Na HC03 +Vit C. +electrolyte +1% acetic acid +enzyme mixture compared with the other treatments and the control. Percentages of dressing, giblets, total edible parts, and abdominal fat were not significantly affected by dietary treatments. However, the least feed cost values were recorded with commercial electrolytes and 1 %acetic acid compared to control diet with no supplementation.
It is concluded that feeding low-protein diet supplemented with amino acids 100 % of the requirements (Met, Lys, and Thr) administered in the feed gave similar performance and better economical efficiency than those obtained from the control diet. Supplementing heat stressed broiler diets with a mixture of sodium bicarbonate +Vit C. +electrolyte +1% acetic acid +enzyme mixture gave highest BWG and feed intake but increased feed cost /kg dressed weight by 14.3%of the control but the least feed cost values were for electrolyte or 1 % acetic acid.
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| Publication year |
2006
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| Pages |
PP. 78
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| Availability location |
مكتبة معهد بحوث الانتاج الحيوانى-شارع نادى الصيد- الدقى- الجيزة
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| Availability number |
994
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| Organization Name |
Animal Production Research Institute (APRI)
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| Country |
Egypt
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| Author(s) from ARC |
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| Agris Categories |
Animal feeding
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AGROVOC
TERMS |
Amino acids.
Broiler chickens.
Economic analysis.
Heat stress.
Lysine.
Methionine.
Performance testing.
Protein restricted diets.
Proteins.
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| Publication Type |
PhD Thesis
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