| Titles |
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English :
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Effects of microbial phytase without or with cell- wall splitting enzymes on the performance of broilers fed marginal levels of dietary protein and metabolizable energy
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Arabic :
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تأثير إضافة أنزيم الفيتيز الميكروبي بدون أو مع مخلوط أنزيمات محللة لجدار الخلايا على أداء كتاكيت اللحم المغذاة على علائق تحتوى على مستويات تحت مثالية من البروتين الخام و الطاقة الممثلة
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| Abstract |
A force feeding assay was employed in a preliminary trial to evaluate true amino acid availabilities ( TAAA), as well as nitrogen corrected apparent metabolizable energy (AMEn ) of yellow corn, soy bean meal (44%CP), sunflower meal and rice bran as affected by supplementation with microbiel phytase (Natuphos ® 10000 ) at 1000 FTU/kg. A six-wk feeding trail was also conducted, in which four experimental vegetable broiler diets were formulated to contain two crude protein (CP) levels (intermediate or low ). There were two levels of AMEn within each of these CP levels (high and low ). These diets were supplemented without or with 700 FTU phytase /kg. Also a combination of cell-wall degrading multienzyme mixture optizyme® (Opt) at 0.075% and phytase at 700 FTU/kg diet was added to the low level of energy of both intermediate and low protein levels. Therefore, there were 10 experimental groups, besides the positive control diet (high protein- high energy ) containing the practical level of protein and energy in broiler diets. Each diet was fed to four replicates of 10 broilers during 1-42 d of age. Results obtained could be summarized as follow: Phytase addition at 1000 FTU/kg improved TAAA of yellow corn, soybean meal and rice bran, as well as AMEn of corn, soyabean meal sunflower meal and rice bran. Nitrogen (N), ether extract (EE), crude fiber (CF) and ash contents of excreta of the phytase supplemented-groups decreased and their digestibilities were improved. Reducing dietary protein and energy level decreased growth performance and the severity of the reduction increased with decreasing both levels, whereas growth, feed conversion ratio (FCR) and economic efficiency were totally recovered by phytase addition at 700FTU/ kgdiet. Combination of 0.075% Opt and 700 FTU phytase to the intermediate protein-low energy diet improve FCR and economic efficiency compared to its respective control supplemented with phytase only as well as its negative control. Except for these cases, cell-wall splitting enzyme had insignificant enhancing effect over phytase on the performance of broilers fed diets containing low energy concentration.
Phytase supplementation at 700 FTU/kg diet without or with 0.075% Opt had no effect on chemical composition of meat and liver as well as physical characteristics of meat, which correlated significantly with dietary protein and energy concentration. Concentration of plasma calcium (Ca) was significantly increased when phytase was supplemented at 700 FTU /kg diet to intermediate protein level, while plasma inorganic phosphorus (Pi) showed only significant response upon phytase addition to low protein-low energy diet. Phytase supplementation at 700 FTU/kg diet to the intermediate protein-high energy level resulted in the best growth, FCR and economic efficiency of broiler.
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| Publication year |
2001
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| Pages |
521-547
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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 |
Animal Production Research Institute (APRI)
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| City |
الاسكندرية
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| serial title |
Egyptian Poultry Science
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| ISSN |
1110-5623
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| Author(s) from ARC |
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| External authors (outside ARC) |
يوسف عطية
جامعة الاسكندرية
سيد عبد الرحمن
جامعة المنوفية
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| Agris Categories |
Animal feeding
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AGROVOC
TERMS |
Amino acids.
Broiler chickens.
Energy value.
Enzymes.
Performance testing.
Phytase.
Proteins.
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| Publication Type |
Journal
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