Dietary Cassava Single Cell Protein and Their Interaction in Broiler Chicks.

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Kamal Abdel Bagi Mohamed., Mohamed
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Three experiments were run to study effects of feeding cassava root meal (CRM), single cell protein (SCP) and their interaction on some biochemical haematological and histopathological changes beside performance, carcass yield and quality in broiler chicks. A total of 195 unsexed Hydro broiler chicks were reared for one week adaptation period and then randomly allotted to three treatments in 4 groups x 3 replications x 5 heads, 4 x 3 x 5 and 5 x 3 x 5. Group 1 in each experiment served as the control group. The rations for the 3 experiments were formulated to be isocaloric (3.00 Mcal ME/kg) and isonitrogenous (22%). CRM in experiment 1 replaced sorghum (60% of the ration) in the ratios 0, 20, 40 and 60% in groups 1, 2, 3 and 4, respectively. SCP in experiment 2 replaced conventional proteins groundnut cake, sesame cake and wheat bran (33% of the ration) in the ratios 0, 25, 50 and 75% in groups 1, 2, 3 and 4, respectively. In experiment 3, the highest level of CRM (60%) was varied with maximum SCP (75%) in group 2 and minimum SCP (25%) in group 3. The lowest level of cassava (20%) was also varied with the maximum and minimum SCP in groups 4 and 5, respectively. The feeding period continued for 6 weeks when half of the experimental chicks were slaughtered for carcass analysis. The remaining chicks in all experiments continued feeding on the control diet for a two-week recovery period. Health parameters of the birds were closely observed. Feed intake and liveweight were taken during the feeding period on slaughter; blood was taken for serum analysis and cellular counts. Slaughter and carcass data as well as subjective and objective meat quality and chemical parameters of lean were recorded. Tissue samples from vital organs liver, heart, spleen and slaughter intestines were collected at both slaughters. No significant changes were observed in the level of total plasma proteins, albumins, globulins, uric acid, alkaline phosphates and GOT in the three experiments. Similar results were recorded in haematological parameters in the three experiments during the feeding and recovery periods except for Hb values of CRM fed chicks where treatment effect was significant (P < 0.05) and the value of group 2 (7.45±0.43g%) was the lowest of treatment groups during the feeding period. For CRM and SCP dietary interaction, there were also significant treatment effects on PCV and Hb during the feeding period with group 3 recording the highest values (33.50±0.70%, 9.03.±0.09g%), respectively, but elevated values were still within normal physiological limits. No apparent digestive or ill health effects were observed on CRM, SCP and their interaction at all feeding levels of replacement. Treatment effect was not significant (P > 0.05) on liveweight gain, feed intake, feed conversion ratio, hot or cold dressing percentages, non-carcass yield, commercial cuts, meat and bone percentages of selected cuts (thigh, drumstick and breast), subjective or objective meat quality attributes or chemical composition of lean at all levels of either dietary CRM, SCP or their interaction. No fishy smell or odd flavours were recorded with subjective meat quality.
Dietary Cassava Single Cell Protein and Their Interaction in Broiler Chicks