Effect Of Different Iron On Sources On The Growth And Compensation Of Genetically Improved Farmed Tilapin

The study was conducted to investigate the effects of growth performance, apparent digestibility and iron concentration in the tissue, organ and iron compensation effect from different sources of iron in GIFT （Genetically Improved Farmed Tilapin） whose initial weight was about6.79g). GIFTs were fed with diet contain casein, dextrin and the different kind iron source for70days by circulating water. The iron sources were ferrisulphas, ferric chloride, ferrous chloride, ferrous citrate, FeTPP. respectively contained100mg/kg Fe. The main results are as follows:1. In the entire breeding cycle. rate of weight gain （RWG） of ferric chloride in basic diet significantly higher than the other4groups. Take this point as a reference, the ferrous chloride additives are suitable for the basal diet of GIFT under the same conditions of feed ingredients.2. Iron valence plays a key role in iron digestion for fish. In apparent digestibility Fe2+is much more easily digested and absorbed than Fe³⁺ does.3. In the five groups, the accumulation of iron in the spine, Gill, muscle, spleen, liver, intestines and blood has no significant effect （P>0.05）.4. The dynamic change of iron content in tissues and organs was slight during the whole process of the experiment, but the iron content was different. Iron distribution indicates as follows:spleen> intestinal> liver> Gill, muscle> spine.5. Diet content appropriate amount of iron has beneficial effect on growth in tilapia. Complement iron to tilapia When it suffered with iron deficiency can make it obtain certain compensatory growth, recover weight gain rate.