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Twenty buffalo calves of 10-month of age and an average initial live body weight (LBW) 235 kg were chosen and divided into five similar groups (4 animals in each), based on their LBW. Animals were used in 220days randomized complete block design for feeding trial. This study aimed to evaluate the effect of feeding rations contained different levels from iodine (I) on productive performance of fattening buffalo calves. Concentrate feed mixture (CFM), berseem hay (BH) and rice straw (RS) were given to animals as a control ration (I0) without supplementation, while the other groups I1 , I2, I3 and I4, received the control ration supplemented with iodine at the levels of 0.5, 1.00, 1.50 and 2.00 mg I per kg DM intake/h/d, respectively. Five digestibility trials were carried out to determine the digestibility coefficient and nutritive values of experimental rations. Blood samples were collected from all animals at 4 hrs post feeding to measure some blood parameters. Results obtained could be summarized as follows: 1Supplementing buffaloes ration with different levels of I improved the digestibility coefficient of all nutrients shown the adding 2 mg I was the best. TDN were 62.22, 64.99, 67.68, 69.71 and 72.64% for I0, I1, I2, I3 and I4 respectively; the respective values of DCP were 7.01, 7.99, 8.59, 9.25 and 10.00% at the same treatments. 2Average daily gain were 960, 1045, 1105, 1156 and 1270 gm/h for animals feed I0, I1, I2, I3 and I4 respectively, showing the best daily gain with animals feed 2 mg I/kg DMI (I4). 3Animals fed ration I4 were the best feed conversion expressed as kg DM, TDN and DCP per kg gain, being 4.96, 3.61, and 0. 50 kg, respectively. 4Also, animals fed I4 appeared to the best economical efficiency (1.91) with the lowest feed cost/kg gain (12.02 LE). 5Iodine supplementation significant improved the blood contents of RBC, WBC, Hb, PCV, total protein, globulin, glucose, triiodothyronine (T3) and thyroxin (T4). Generally, it could be concluded that I supplementation for ration of growing Egyptian buffalo calves considerably improved nutrients digestibilities, nutritive values and economic efficiencies, showing the level with 2 mg I/kg DMI was the best treatment.

journal of animal and poultry production

NUTRITIONAL STUDIES ON SOME DIFFERENT SOURCES AND LEVELS OF IODINE ON PRODUCTIVE PERFORMANCE, RUMINAL FERMENTATION AND BLOOD CONSTITUENTS OF BUFFALO. 3-EFFECT OF DIFFERENT LEVELS OF IODINE ON PRODUCTIVE PERFORMANCE OF BUFFALO CALVES.