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Physilolgical and immunological studies on broilers fed diets supplemented with different levels of microbial phytase enzyme
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Abstract: The present experiment was conducted to evaluate the effect of adding different levels of microbial phytase and available phosphorus on some physiological and immunological parameters of broiler chicks. A total of 270 one-day-old chicks was divided into nine treatments of 30 birds each, which subsequently were subdivided into 3 replicates, 10 birds each. The nine treatments were 1- 0.45 AvP%+ 0 FU (control group), 2-0.45 AvP%+ 500FU, 3- 0.45 AvP% + 750 FU, 4- 0.30 AvP%+ 0 FU, 5- 0.30 AvP%+ 500 FU, 6- 0.30 AvP% + 750 FU, 7- 0.15 AvP% + 0 FU, 8- 0.15 AvP%+ 500 FU, 9- 0.15 AvP%+ 750 FU. The experiment was run for 6 weeks. Body weight, feed consumption and feed conversion were recorded weekly. At the end of experiment (6 weeks), three birds were randomly taken from each treatment and slaughtered. Plasma calcium, phosphorus, cholesterol, total lipids, total protein, acid, alkaline phosphates and some blood constituents (hematocrit %, hemoglobin %, Red blood cells, (106m3), M.C.H. (l015L), M.C.V. (1012g) and M.C.H.C. % were measured at 6 weeks of age.
The main results can be summarized as follows:
- The higher level of microbial phytase gave significantly the best live body weight and weight gain at 2 and 6 weeks of age in the group fed 750 FU phytase level, no significant difference between the two phytase levels (500-750 FU) was detected at 4 weeks of age.
- The low P diet (0.15%) significantly decreased feed consumption of broilers at 2, 4 & 6 weeks of age, while, the groups fed 500 & 750 FU phytase levels showed high feed consumption and better feed conversion compared with the control group at 0-6 weeks of age.
- The birds fed low P (0.15%) and high phytase (750 FU) diet has significant higher relative weight of thymus, however thyroid gland, spleen and bursa relative weights were not affected.
- The shank relative weight and tibia length were higher in the group fed (0 FU) phytase and high P diet (0.45 %) compared with other groups fed high phytase and low P diet, while, no significant differences in tibia weight and dry tibia weight were observed in all groups.
- At 6 weeks of age, the plasma calcium, total protein, alkaline phosphatase in the group fed 500 FU phytase were significantly higher than the control group (0 FU) phytase. The groups using 750 FU phytase gave significantly higher phosphorus and lower total lipids, in plasma cholesterol it was significantly lower, in plasma acid phosphates, it was significantly higher in control group (0 FU phytase) than the phytase treated groups.
- Some blood constituents (immunity traits) were significantly (p<0.05) affected by Phytase treatment, for example, hematocrit %, hemoglobin %, and M.C.V. (10-12g) were significantly higher with high level of 750 FU in broiler chicks fed different levels of available phosphorus compared with 500 and 0 FU of Phytase at 6 weeks of age.
- The addition of phytase in diets significantly improved the physiological, immunolgical and productive performance in broiler chicks.
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| Publication year |
2005
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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 |
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| serial title |
Egyptian Journal of Agricultural Research
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| Author(s) from ARC |
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| External authors (outside ARC) |
ابراهيم الوردانى السيد حسن
جامعة عين شمس
عبد المجيد مخيمر عبد المقصود
جامعة عين شمس
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| Agris Categories |
Animal physiology - Nutrition
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AGROVOC
TERMS |
Broiler chickens.
Immunological factors.
Phosphorus.
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| Proposed Agrovoc |
Physilolgical;microbial phytase enzyme;
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| Publication Type |
Journal
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