studying the effects of replacement cow skin hydrolyze with fish meal on blood indexes in flower horn fishes

the present study was designed to evaluate blood factors in the flower horn fishes that were fed with different levels of hydrolyzed cow skin. 216 fishes with average weight and length, respectively, 0.95 ± 0.2 (g) and 3.7 ± 0.2 (cm) during the 100-days period of experiment were fed. results showed that in the treatments fed diets containing 40% hydrolyzed cow skin, number of rbc with mean  (2.5 ± 0.33) ×106 , percent of htc (25 ±1.72) and hemoglobin (8.5 ±1.66) grams per deciliter, was increased compared to controls (p<0.05). the maximum of wbc (18.1 ± 1.82) ×103 was related to diet containing 40% hydrolyzed cow skin too that had non-significant increase compared to the control diet (p>0.05). the highest values of mcv factor with average (1.04 ±0.32) was related to treatment %100 (p< 0.05) and the lowest values of it with average (0.96 ±0.52) was related to treatment 60% (p< 0.05). but in mch, the highest measured values with average (3.45 ±0.72), was related to the control diet and the lowest values of it with average (3.36 ±0.24) was related to treatment 20% (p<0.05). in mchc factor, the highest measured values with average (35.00 ±3.81), was related to the treatment 20% and the lowest values of it with average (28.39 ±3.78) was related to treatment 60% (p< 0.05). so, the best level of cow skin hydrolysis to add to the diet of ornamental fish flower horn was 40%.