|
|
Response of broilers to phytase supplementation
|
|
Abstract: This study was carried out at Poultry Research Station and Laboratories of Poultry Nutritional Department, Agricultural Research Center, Ministry of Agriculture, Under supervision of Animal Production Department (Nutrition), Faculty of Agriculture, Cairo University. Two experiments were conducted to investigate the effect of microbial phytase levels either with different levels of dietary protein (Expt. 1) or dietary ME (Expt. 2) on growth performance, nutrients digestibility, carcass traits, some blood constituents, tibia analysis and economical efficiency of broiler chicks.
In Expt. 1, at a constant ME level, three levels of dietary crude protein (high, medium, low) were used with four levels of supplemental phytase (0, 5OO, 750, 1000 FTU/Kg) in 3x4 factorial design. Accordingly, a total of 12 treatments were formulated either in starter (0-3 weeks), grower (4-5 weeks), and finisher (6-7 weeks) periods. Therefore, a total number of 360 one-day old Arbor Acres broiler chicks were assigned into 12 groups, each in 3 replicates.
Ia Expt. 2, at a constant CP level, two levels of dietary protein (high, low) were used with four levels of supplemental phytase (0, 500, 750, 1000 FTU/Kg) in 2x4 factorial design. Therefore, a total of 8 treatments were formulated either in starter (0-3 weeks), grower (4-5 weeks), and finisher (6-7 weeks) periods. In such experiment, a total of 240 old-day old Arbor Acres broiler chicks were assigned into 8 groups, each in 3 replicates. In both treatments, chicks were randomly allocated in wire mesh floor batteries and kept under similar managerial and hygienic conditions. Artificial lighting was provided 24 hours daily during the whole experimental period which lasted for 49 days of age. Under the present experimental conditions, phytase supplementation at levels ranged between 500-1000 FTU/Kg diets were more effective when added to low protein diets than being supplemented to low energy diets for broilers. Therefore, based on the concept that poultry tend to eat to meet their energy needs, assuming that the diet is adequate in essential nutrients, so, it is possible to recommend: (1) Not to use microbial phytase as a supplement to low ME broiler diets. (1) Microbial phytase could be effective in lowering dietary CP by about 2 % than the recommended level. This would be economically valuable, since protein is the most expensive feed nutrient in poultry diets.
|
| Publication year |
2006
|
| Pages |
PP.220
|
| Availability location |
مكتبة معهد بحوث الانتاج الحيوانى-شارع نادى الصيد- الدقى- الجيزة
|
| Availability number |
993
|
| Organization Name |
|
| Country |
Egypt
|
| Author(s) from ARC |
|
| Agris Categories |
Animal feeding
|
AGROVOC
TERMS |
Blood composition.
Broiler chickens.
Economic analysis.
Energy value.
Phytase.
Proteins.
|
| Proposed Agrovoc |
growth performance;nutrients digestibility;carcass traits;tibia analysis;
|
| Publication Type |
PhD Thesis
|