EFFECTS OF DIETARY PHYTASE AND DICALCIUM PHOSPHATE ON PHOSPHORUS BIOAVAILABILITY WTmMLKTTLAPIAOREOCHROMIS NILOTICUS
Abou Zaid, M., Hellall, A., El-Sayed, A., Hasan, M., El-Samara, M. (2002). EFFECTS OF DIETARY PHYTASE AND DICALCIUM PHOSPHATE ON PHOSPHORUS BIOAVAILABILITY WTmMLKTTLAPIAOREOCHROMIS NILOTICUS. EKB Journal Management System, 6(1), 159-185. doi: 10.21608/ejabf.2002.1732
Mohamed Abou Zaid; Ahmed Hellall; Abd-Allah El-Sayed; Mohamed Hasan; Mohammed El-Samara. "EFFECTS OF DIETARY PHYTASE AND DICALCIUM PHOSPHATE ON PHOSPHORUS BIOAVAILABILITY WTmMLKTTLAPIAOREOCHROMIS NILOTICUS". EKB Journal Management System, 6, 1, 2002, 159-185. doi: 10.21608/ejabf.2002.1732
Abou Zaid, M., Hellall, A., El-Sayed, A., Hasan, M., El-Samara, M. (2002). 'EFFECTS OF DIETARY PHYTASE AND DICALCIUM PHOSPHATE ON PHOSPHORUS BIOAVAILABILITY WTmMLKTTLAPIAOREOCHROMIS NILOTICUS', EKB Journal Management System, 6(1), pp. 159-185. doi: 10.21608/ejabf.2002.1732
Abou Zaid, M., Hellall, A., El-Sayed, A., Hasan, M., El-Samara, M. EFFECTS OF DIETARY PHYTASE AND DICALCIUM PHOSPHATE ON PHOSPHORUS BIOAVAILABILITY WTmMLKTTLAPIAOREOCHROMIS NILOTICUS. EKB Journal Management System, 2002; 6(1): 159-185. doi: 10.21608/ejabf.2002.1732

EFFECTS OF DIETARY PHYTASE AND DICALCIUM PHOSPHATE ON PHOSPHORUS BIOAVAILABILITY WTmMLKTTLAPIAOREOCHROMIS NILOTICUS

Egyptian Journal of Aquatic Biology and Fisheries
Article 8, Volume 6, Issue 1, January 2002, Page 159-185  XML PDF (1.2 MB)
Document Type: Original Article
DOI: 10.21608/ejabf.2002.1732
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Authors
Mohamed Abou Zaid1; Ahmed Hellall1; Abd-Allah El-Sayed2; Mohamed Hasan3; Mohammed El-Samara3
1Marine Biology and Fish Science Section, Zoology Department, Faculty of Science, Al-Azhar University, Nasr City, Cairo, Egypt.
2Marine Science Department, Faculty of Science, Suez Canal University, Ismailia, Egypt.
3National Institute of Oceanography and Fisheries, Red Sea Branch, Suez, Egypt.
Abstract
The efficiency of supplemented diets with dicalcium phosphate' (DCP) and phytase (500 and 1000 units) replaced with dietary fish meal instead of soybean meal or full fat soybean at two replacing levels of 50% or 75% for Nile tilapia was investigated.The results of Nile tilapia (initial weight 12.10 ± 0.6 gm) revealed that the average growth performance of fish fed diet supplemented with phytase (500 and 10C0 units) had improved feed conversion ratio and specific growth rate. However, it was also shown that the replacing 50% of the fish meal with soybean meal or soybean full fat in tilapia diet were successful and had no adverse effect on growth.The diet supplemented with DCP or phytase (500 or 1000 units) significantly (PO.01) increased body protein content, body fat, body ash and calcium concentration in both vertebral column and the whole body than control. An inverse relationship between phytase dose and fat content was seen in the present results. However, fish fed the control diet or diet contained 50% of the protein from either soybean full fat or soybean meal gave the highest body protein content, crude ash and the lowest value of ether extract and gross energy content. Calcium content of whole body was higher in the fish fed the control diet than in fish fed any diet containing plant protein sources. The same trend was observed for calcium in the vertebral column.
Keywords
Nile tilapia; Oreochromis niloticus; phosphorus; phytase; dicalchim- phosphate; phosphorus utilization and phytic acid
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