| Titles |
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English :
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Effect of dietary crude protein level and sources and phytase addition on productive performance, carcass characteristics, meat quality and plasma constituents of Rosters
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Arabic :
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تأثير مستوى و مصدر البروتين و اضافة انزيم الفيتيز على الأداء الإنتاجي و صفات الذبيحة و نوعية اللحوم ومكونات بلازما الدم للشمورت
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| Abstract |
Nienty six unsexed day-old roaster type chicks were randomly distributed into four experimental diets with three replicates each, containing eight chicks per replicate. Diets were formulated to contain the high level of crude protein based on soybean meal (SBM) as main source of protein in the growing/finishing periods (20/18% CP SB; positive control) or based on a mixed protein source (MPS) including sesame meal (SSM), rapeseed meal (RSM) and poultry by product meal (PBPM) to replace 35.5/50.6% of SBM protein in the growing/finishing diets (20/18% CP MPS) or low protein, diet containing MPS of SSM, RSM and PBPM to replace 35.5/50.6% of SBM protein in the growing/ finishing diet ( 18/16% CP). The low protein (18/16% CP MPS) was fed without or with 600 FTU phytase/ kg to study the impact of phytase on protein utilization. Thereby, there were four experimental diets of which two levels of crude protein (20/18 vs. a mixture of 18/16% CP with similar ingredients), two sources of dietary protein (SBM vs.SBM+SSM+RSM+PBPM), and two levels of phyase (0 and 600 FTU) were studied. Productive performance, carcass characteristics, meat quality and plasma constituents of roasters were the studied criteria.
Body weight and economic efficiency of birds fed diet containing 20/18% CP MPS or phytase supplemented low protein diet were better than those fed 20/18% CP SB and the unsupplemented low protein diet. Results indicated that phytase supplementation to low protein diet improved feed conversion ratio (FCR) to the level of high protein levels. Carcass yield, and internal organs were not significantly affected by dietary CP level or inclusion of either different protein sources or phytase addition to low- protein diet. Similar trends were observed in physical characteristics and chemical composition of meat except for CP of meat, which was restored to the level of the high CP upon phytase addition to low CP diet. Phytase addition to low protein diet restored plasma protein and its fraction, Ca and inorganic phosphorus to the level of the positive control.
It could be concluded that SSM, RSM, or PBPM can replace 35.5/50.6% of SBM protein in the growing/finishing diets for local hybrid chicks used for roaster production in Egypt and yield better productive performance and economic efficiency than that based on SBM as a sole protein supplement. Also, phytase addition to low CP diet improved productive performance and economic efficiency to the level of the high protein level which permits a reduction of 2%CP in the diets for roaster type chicks.
Keywords: chickens, phytase, intake, gain, performance, economic efficiency.
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| Publication year |
2003
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| Pages |
61-75
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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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| serial title |
Egyptian Journal Nutrition and Feed
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| Author(s) from ARC |
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| External authors (outside ARC) |
يوسف عطية
جامعة الاسكندرية
هيام ابو المعاطى
جامعة المنصورة
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| Agris Categories |
Animal physiology - Nutrition
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AGROVOC
TERMS |
Carcass composition.
Chickens.
Crude protein.
Meat.
Performance testing.
Phytase.
Production.
Quality.
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| Proposed Agrovoc |
intake;gain;economic efficiency;
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| Publication Type |
Journal
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