CALCIUM, PHOSPHORUS AND MANGANESE CONTENT AND AVAILABILITY IN POULTRY FEEDS
Keywords:Broiler, minerals availability, spectroscopic methods, poultry feeds
The calcium (Ca), phosphorus (P) and Manganeese (Mn) contents of common tropical poultry feeds were determined by spectroscopic methods. Mn content ranged from 9.1 mg/kg in maize to 145. mg/kg in oyster shell; Ca ranged from 0.03% in maize to 37.5% in oyster shell; and P ranged from 0.01% in palm Oil to 14.12% in bone meal. The commonly used energy. protein and mineral sources contained low, medium and high mineral contents respectively.
One hundred and eight (108) four-week old broiler chicks were used to estimate the biological availability of Ca- P and Mn in maize, groundnut cake (GNC), fish meal (FM), bone meal (BM), oyster shell (OS) aid manganese sulphate (Mn. S04). The availability from maize. CINC, FM, BM and OS were found to be 53.9, 71.1, 89.4, 94.6 and 96.5% for Ca; 40.8, 59.1, 90.4, 88.1 and 90.6% for P; 64.2, 61.4, 93.7, 81.3 and 99.3% for Mn. Availability of Mn from MnSO4 was 90% The biological availability of Ca, P and Mn in the feeds tested differed (P<0.05) from each other, and P availability from feeds of plant origin was higher than the value of 33% conventionally reported.