Abstract

CORTES-CUEVAS, Arturo; ARCE-MENOCAL, José; AVILA-GONZALEZ, Ernesto  and  LOPEZ-COELLO, Carlos. Phosphorus bioavailability, amino acid digestibility and metabolizable energy of broiler chick diets supplemented with low-oil distiller’s dried grains with solubles. Veterinaria México OA [online]. 2019, vol.6, n.3, 00004.  Epub Apr 14, 2020. ISSN 2448-6760.  https://doi.org/10.22201/fmvz.24486760e.2019.3.543.

Phosphorus (P) bioavailability, crude protein (CP), amino acid (AA) digestibility, and apparent metabolizable energy (AMEn) were determined in broiler chick diets, supplemented with one of two low-oil distiller’s dried grains with solubles (oil contents 6.54% and 5.35% for DDGS A and B, respectively). Diets were provided ad libitum in a mash form, from days 8 to 21 of age. In Experiment 1, one day old male broiler chicks (n=210) were assigned to one of 7 treatments, with 3 replicates of 10 birds each. Animals in treatment 1 (T1) were fed a basal diet formulated to be deficient in nonphytate P (0.14%). Birds in T2 and T3 received the basal diet supplemented with 0.05% or 0.10% of P from monodicalcium phosphate (MCP), respectively. Phosphorus from DDGS was added to diets in T4 (0.05% from DDGS A), T5 (0.1% from DDGS A), T6 (0.05% from DDGS B) and T7 (0.1% from DDGS B). Percent of inclusion of DDGS was dictated by total P content as determined by chemical analyses. Growth performance and P intake were assessed in all birds. Phosphorus bioavailability was determined using the slope ratio assay, with tibia ash as the response variable. For Experiment 2, one-day-old male broiler chicks (n=200), were assigned to 5 treatments with 4 replicates of 10 birds each. A sorghum-soya control diet was given to animals in T1. Treatments 2 and 3 included this same diet supplemented with either 5% or 10% of DDGS A. Birds in T4 and 5 received the control diet with either- 5% or 10% of DDGS B. Amino acid digestibility was measured from ileal contents in 7 euthanized birds from each group at day 21. Apparent metabolizable energy was determined in oven dried feces from all animals during the last 3 days of the experiment. Weight gain and feed consumption increased (P < 0.001) with larger inclusion of dietary P in birds from experiment 1. Relative P bioavailability for DDGS A and B was 72% and 86% respectively, from a P total content of 0.85% and 0.94%. Growth performance was similar for all treatment groups in experiment 2 (P > 0.05). The average apparent ileal amino acid digestibility coefficient for DDGS A 76.5% and B was 76.4%. No differences were found for essential AA coefficients between the two DDGS (P > 0.05). The AMEn values on a dry matter basis were 2828 and 2854 kcal/kg for DDGS A and B, respectively.

Keywords : Amino acids; Ileal digestibility; Apparent metabolizable energy; Available phosphorus; Low-oil DDGS.

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