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Swine Nutrition and Feed Technology
Asian-Australasian Journal of Animal Sciences 1992;5(2): 237-248.
DOI: https://doi.org/10.5713/ajas.1992.237    Published online June 1, 1992.
Effect of dietary protein and energy levels on growth and carcass yield performances of spent Starcross hens
M. Salah Uddin, A. M. M. Tareque, M. A. Rahman, M. A. R. Howlider, M. Jasimuddin Khan
The effect of 16 different dietary rations, computed by the combinations of 13, 16, 19 or 22% CP and 2600, 2800, 3000 or 3100 kcal ME/kg, on growth performances and carcass yield of Starcross layers were assessed in two similar experiments. In both experiments, the body weight, eviscerated carcass yield, edible carcass yield, length of digestive tract and shank length increased but the feed intake decreased linearly with the increase of dietary CP and ME levels. The liver and gizzard weights as percentages of live weight tended to be increased with the increase of dietary CP and ME levels. The carcass dry matter, crude protein, fat, ash and energy content were not influenced by the dietary CP and ME levels. Dietary CP levels had positive correlations with all the parameters (except feed and energy intake and carcass dry matter). However, the dietary ME levels were positively correlated with all the parameters (except feed and energy intake; carcass dry matter and ash) in both experiments. The higher values were noted for all the parameters (except gizzard and carcass fat percentages) studied in Experiment 1 compared to those observed in Experiment 2.
Keywords: Protein; Energy; Carcass; Performance

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