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 T_2, T₃ and T₅ (74.50) than T₀ (62.16), T₁ (73.15) and T₄ (70.16%). The true absorption of P for supplemented diets (T_1, 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