Effect of dietary phosphorus, phytase, and 25-hydroxycholecalciferol on broiler chicken bone mineralization, litter phosphorus, and processing yields

Abstract

Three floor pen experiments (Exp) were conducted to evaluate low nonphytin P (NPP) concentrations and the NPP sparing effect of phytase (PHY) and 25-hydroxycholecalciferol (25D) on bone mineralization, bone breaking during commercial processing, litter P, and water-soluble P (WSP) concentrations. Tested treatments (TRT) were control, National Research Council NPP; University of Maryland (UMD) NPP; UMD + PHY, UMD NPP reduced by 0.064% NPP + 600 U of PHY/kg; UMD + PHY + 25D, UMD NPP reduced by 0.090% NPP + 600 U of PHY and 70 microg of 25D/kg; control + PHY mimicked the industry practice of diets by 0.1% when PHY is added; and negative control with 90% UMD NPP concentrations. UMD + PHY and control + PHY diets contained 600 U of PHY/kg, and UMD + PHY + 25D contained 600 U of PHY + 70 microg of 25D/kg. Performance results were presented separately. After each Exp, litter P and WSP were determined, and bone measurements were obtained on 8 or 10 broilers per pen. Tested TRT did not affect broiler BW. Femur ash weight of broilers fed the UMD and UMD + PHY + 25D was lower in all Exp compared with that of broilers fed the control diet. Femur ash was similar for control and UMD + PHY broilers, yet averaged over all Exp, UMD + PHY broilers consumed 39% less NPP and required less NPP per gram of femur ash than those on the control (4.87 and 7.77 g of NPP/g of ash, Exp 3). At the end of Exp 3, broilers were processed in a commercial facility. Despite reductions in NPP intake and bone mineralization, no differences were observed in measurements of economic importance (parts lost, carcass yield, and incidence of broken bones). The P excretion per bird was lowest for birds fed the UMD + PHY + 25D diet followed by those fed the UMD + PHY and negative control diets (10.44, 12.00, and 13.78 g of P/bird, respectively) and were highest for those fed the control diet (19.55 g of P/bird). These results suggest that feeding diets low in P together with PHY and 25D will not affect performance or increase losses at processing while resulting in improved P retention and reductions in P and WSP excreted.

Bone Characteristics of Broilers Supplemented With Vitamin D

“…The carcass yield obtained in the present trial did not differ from a previous study (Angel et al, 2006) using different dietary P levels of P and supplemental vitamin D sources, including the 25-hydroxycholecalciferol. Brito et al (2010) obtained higher carcass yield (p<0.05) with the dietary addition of 25-hydroxycholecalciferol compared with cholecalciferol.…”

Efeito da vitamina D3 e 25-hidroxi-colecalciferol sobre o desempenho, o rendimento de carcaça e a morfologia intestinal de frangos de corte¹

“…Esses resultados corroboram aqueles observados por Korver (2005), porém, diferem dos encontrados por Angel et al (2006). O estudo sobre os efeitos de diferentes fontes de vitamina D sobre características de carcaça ganhou força nos últimos anos e há relatos de redução nas perdas e de condenações das carcaças nos abatedouros, em decorrência da melhoria na qualidade ou densidade óssea.…”

Effect of dietary phytase suplementation on the performance, bone densitometry, and phosphorus and nitrogen excretion of broilers

“…However, in literature, phytase nutritional matrix results were not considered in the formulation of the experimental diets, and therefore Using low available phosphorus levels and phytase inclusion, Persia & Saylor (2006) showed that phytase improved the performance of 8-to 22-day-old broilers, as opposed to Angel et al (2006), who did not find any broiler performance differences during the starter phase when adding phytase to low available phosphorus diets. Table 5 shows performance parameter means for the phase of 22-42 days of age.…”