The Effect of Varying Calcium and Phosphorus Levels on the Performance of Starting Broiler Chicks in the Tropics

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Okorie, A. U.
Anungwa, F.O.I.
Njoku, E. O.
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An experiment .involving seven hundred and twenty day~old broiler chio~s was oonduoted tu investigate the effeot of different levels of calcium to phosphorus rart'~os on ,~he performance of broiler birds in the trop~cs. The experiment employed a completely randomized design of six different calcium ~o phoS'phorus dietary Itreatments. Each 'treatment was replicated four times wi,th !thirty birds per rep,licate. The levels of calcium and phosphorus ranged from 0.4 to 1.6 pf'rcent and 1.25-0.6 percent resp'ectively, resul'ting ~n calcium (Ca): phosphorus (P) ratios of 1: 2.5, 1: 2.1, 1: 1, 1.5: 1, 1.8: 1 and 2.7: 1 in the six treatments. While feed consumption was significantly poorer at the three lowest levels of phosphorus concentration, live weight ga,in though non-significant among treatments, was least at the lowest calcium level. Based on feed conversion ratios and percent mortality. rthe diiets conta:ining 1.3, 1.4 and 1.6 percent calcium with a co'rrespond. jng 0.85, 0.80 and 0.6 percent phosphorus respectively resulted in the best overall performance. 13
East African Agricultural and Forestry Journal, XLVIII (No 1-4), p. 10-14