Abstract
Simple SummaryVariations in phosphorous (P) digestibility as a function of methodology, phosphate source, physicochemical characteristics and commercial source were evaluated in broilers. Three methodologies and two phosphates (monocalcium phosphate, MCP, and dicalcium phosphate, DCP) from three different commercial sources were used in two experiments. In the first experiment, MCP and DCP were incorporated into a P-deficient diet at two levels of inclusion and P digestibility was evaluated using three methodologies of the regression method (total excreta, marker in excreta and prececal digestibility). In the second experiment, variations in P digestibility of six phosphate sources (three MCP and three DCP) were evaluated using the total collection method. The P digestibility of MCP ranged from 75.2 to 87.4% and from 80.5 to 86.6% for DCP amongst methodologies (p > 0.05). Particle size, surface area, degree of crystallinity and impurities varied amongst commercial sources. The P digestibility of the three tested commercial sources of MCP was 79.6% (MCP1), 70.2% (MCP2) and 65.6% (MCP3); p > 0.05. The P digestibility of the three tested commercial sources of DCP was 80.1% (DCP1), 77.4% (DCP2) and 71.4% (DCP3); p > 0.05.The objective of this study was to compare the total tract (total excreta and marker) and prececal methodologies to determine phosphorus (P) digestibility and to evaluate its variation as a function of the physicochemical characteristics of the inorganic phosphate used (monocalcium, MCP and dicalcium, DCP) from different commercial sources. A total of 176 1-day-old male broilers were used in two digestibility experiments. In Experiment 1, one MCP and one DCP were incorporated in the basal diet at two levels. In Experiment 2, MCP and DCP from three commercial sources were incorporated to the basal diet at one level. Physicochemical characteristics of inorganic phosphates were examined, as well. Additionally, bone mineralization and growth performance traits were investigated in both trials. The digestibility of MCP ranged from 75.2 to 87.4% and from 80.5 to 86.6% for DCP amongst methodologies, but differences between total tract and preceal methodologies were not statistically significant. Particle size, surface area, degree of crystallinity and impurities varied amongst commercial sources. The P digestibility of the three tested commercial sources of MCP was 79.6% (MCP1), 70.2% (MCP2) and 65.6% (MCP3); p > 0.05. The P digestibility of the 3 tested commercial sources of DCP was 80.1% (DCP1), 77.4% (DCP2) and 71.4% (DCP3); p > 0.05.
Highlights
In poultry diets, inorganic phosphorus (P) is added to meet P requirements, as it is an essential mineral for skeletal development and bone mineralization [1]
The objective of this study was to compare ATTD of P (ATTDP)-tc, ATTDP-m and pc-DP methodologies to determine P digestibility calculated using the regression method proposed by WPSA [6] and to evaluate variation in P digestibility as a function of the physicochemical characteristics of the inorganic phosphate used (MCP and Di-calcium phosphate (DCP)) from different commercial sources
Bone mineralization and growth performance traits were investigated in both trials
Summary
Inorganic phosphorus (P) is added to meet P requirements, as it is an essential mineral for skeletal development and bone mineralization [1]. Inorganic P sources, show variability in P digestibility in poultry Mono-di-calcium phosphate (MDCP) are the most commonly used forms of inorganic feed phosphates in poultry feed [2]. Matching the nutrient supply precisely with the nutrient requirements of animals is the basis of precision feeding. This is necessary in the interest of safe, high quality and efficient production, while ensuring the lowest possible load on the environment [3]. Precise knowledge on the P availability of mineral sources is required to adjust diets to animal’s requirements and to obtain the consequent economic and environmental advantages [4]
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