Bioavailability Of Phosphorus And Its Effect On The Nutrient Utilization In Cattle

Abstract

Eighteen indigenous growing cattle of two years old having initial live weight of 100 ± 4.5 kg were used to investigate the bioavailability of phosphorus from different sources (Di-calcium phosphate, Bone meal, Sesame oil cake, Mustard oil cake and Poultry liter) and its effect on the nutrient utilization and phosphorus balance of cattle. The animals were divided into 6 groups having 3 animals in each to one of group and randomly allocated into six diets in a Completely Randomized Design (CRD). Six dietary treatments are : T0 (control diet), T1 (Control + DCP), T2 (Control + Bone meal), T3 (Control+ mustard oil cake), T4 (Control+ sesame oil cake) and T5 (Control + poultry litter). The controlled diet contained 0.20% P and DCP, Bone meal, mustard oil cake, sesame oil cake and poultry litter were added to diets T1, T2, T3, T4 and T5, respectively to elevate the dietary P level of 0.45% for meet up the deficiency. The lowest daily DM intake (g/d) was observed in animals fed on diet T0 and the highest value was recorded for diet T5 and significantly (P<0.05) differences were observed among the dietary treatments. The P supplementation either from DCP (T1), bone meal (T2), mustard oil cake (T3), sesame oil cake (T4) or poultry litter ((T5) had no significant effect on organic matter (OM) and CP intake. The apparent digestibility of DM and OM were significantly (P<0.05 and P<0.01) affected by the supplementation of P either from DCP, bone meal, mustard oil cake, sesame oil cake or from poultry litter. But the digestibility of CP, CF, NFE and EE was not significantly (P>0.05) affected by the supplementation of P from these sources. There was no significant (P>0.05) difference in DCP and DCF contents among the dietary treatments. The apparent absorption of P (g/100g) was significantly (P>0.05) higher for dietary groups T2, T3 and T5 (74.50) than T0 (62.16), T1 (73.15) and T4 (70.16%). The true absorption of P for supplemented diets (T1, T2, T3 and T5) was numerically higher than the diet T0, and T4. P balance was significantly (P<0.01) higher for diets T1 (9.11 g/d), T2 (10.87 g/d), T3 (9.65g/d), T4 (8.62g/d) and T5 (11.16g/d) compared to diet T0 (2.75 g/d). The bioavailability of P from control diet, DCP, bone meal, mustard oil cake, sesame oil cake and poultry litter were 62.16, 80.46, 81.97, 81.84.75.22 and 81.47%, respectively among the test materials. It may be concluded that bone meal, mustard oil cake and poultry litter may be used as phosphorus supplement in cattle ration. DOI: http://dx.doi.org/10.3329/bjas.v38i1-2.9910 BJAS 2009; 38(1-2): 33-41