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Using some feed additives in broiler diets
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Abstract: This study was performed to investigate the effects of feeding low protein diets,with or without supplemental probiotic preparations on the performance of broiler chicks.
In addition, nutrients digestibility, carcass traits, some blood components, counts of intestinal bacteria and economic efficiency of treatments were evaluated. The study included two feeding experiments to investigate the efficiency of using some commercial probiotics either in a single form (Exp. I) or as mixtures (Exp.II) along with different levels of dietary crude protein. Three preparations of commercial probiotics were used. The first was BioTop (B) which is dried product contains Bacillus subtilis and zinc oxide, the second was Organic Green Culture (G) which is a dried product of live yeast blended with lactic acid bacteria, while the third one was Avi-Bac (A) which is a concentrate source of lactic acid bacteria and enzymes including amylase, beta-glucanase and hemicellulase.
In Exp.I, two iso-energetic basal diets were formulated to contain the recommended (22 and 20%) and low (20 and 18%) crude protein level for starter (7- 28 days) and grower (29-42 days) periods, respectively. Both starter and grower diets were either supplemented or Dot with each one of the tested probiotics at 0.15%, accordingly, this experiment was conducted in 2x4 factorial design in which a total of 240 unsexed one-week Arbor Acres broiler chicks were assigned to 8 treatments, each in 3 replicates. In Exp. II, the main objective was to investigate the synergistic effect of the tested probiotics when applied as mixtures. This experiment was conducted in 2x5 factorial design i.e. two dietary protein levels and 5 probiotic mixtures. Therefore, a total of 300 unsexed one-week Arbor Acres broiler chicks were used and distributed into 10 treatments, each in 3 replicates. The tested probiotics, under condition of this study, were effective in lowering dietary crude protein by 2% than the recommended. This would be economically valuable, since protein is the most expensive feed nutrient in poultry feeding. Moreover, addition of probiotics as mixtures reduced the loss in growth and feed utilization which resulted from the redaction in dietary protein level.
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| Publication year |
2006
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| Pages |
PP. 137
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| Availability location |
مكتبة معهد بحوث الانتاج الحيوانى-شارع نادى الصيد- الدقى- الجيزة
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| Availability number |
976
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| Organization Name |
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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 |
Blood composition.
Broiler chickens.
Carcass composition.
Digestibility.
Economic analysis.
Probiotics.
Protein restricted diets.
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| Proposed Agrovoc |
intestinal bacteria;
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| Publication Type |
PhD Thesis
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