EFFECT OF PHYTASE SUPPLEMENTATION TO ENERGY· DEFICIENT DIETS ON THE GROWTH PERFORMANCE OF BROILER CHICKS | ||||
| Journal of Animal and Poultry Production | ||||
| Article 5, Volume 30, Issue 7, July 2005, Page 3599-3609 PDF (1.59 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jappmu.2005.238019 | ||||
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| Authors | ||||
| A. H. Abd El-Gawad,1; A. A. Hemid2; M. M.A. El-Moniary1 | ||||
| 1Department of AnImal Production, National Research Centre, Dokkl, Cairo, Egypt. | ||||
| 2Department of Poultry Production, Faculty of Agriculture, Aln Shams University, Cairo, Egypt. | ||||
| Abstract | ||||
| A total number of 175. day-old unsexed "Arbor Acres" broiler chicks were conducted to study the effects of phytase supplementation on growth performance. efficiency at energ,y utilization, carcass characteristics, and tibia measurements ot broiler chicks fed energy-deficient diets. Chicks were divided into five experimental groups, each of 35 cttieks (7 replicates of each group) to receive one of the five experimental diets (control, 75 kcal ME less than control, 150 kcal ME less than control, 75 kcal ME less than control + phytase, 150 kcal ME less than control + phytase). The feeding period was extended tor 49 days. The results obtained are summarized as follows: t-Broiler chicks fed energy-deficient diets recorded lower values (P<O.05) at live body weight; weight gain and depressed feed conversion ratio and relative energy efficiency compared to control diet. 2-Addition of phytase to the energy-deficient diets significantly increased live body weight (LBW). body weight gain (8WG) and improved feed conversion ratio and relative energy efficiency. 3-No significant effects were found on percenlages of dressing, liver, gizzard, heart, abdominal fat, total edible parts, breast meat, and thighs meat. 4- Tibia measurements (OTW, Tl, TW, TBS and tibia content of ash, Ca and P) of birds ted the control diet refonmulated with phytase did not differ from those of birds fed energy-deficient or control diets. In general, it could be recommended that reformulation enerqy-defcient diets by phytase supplementation could restore body weight gain and improve feed conversion ratio. | ||||
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