Date of Graduation
5-2024
Document Type
Thesis
Degree Name
Master of Science in Poultry Science (MS)
Degree Level
Graduate
Department
Poultry Science
Advisor/Mentor
Rochell, Samuel J.
Committee Member
Kidd, Michael T.
Second Committee Member
Owens, Casey M.
Keywords
standardized ileal digestibility; apparent ileal digestibility; dietary P values
Abstract
Concerns around the economic and environmental consequences of suboptimal or excess dietary P levels in broiler diets has led to increased interest in determining ileal P digestibility values for feed ingredients. Therefore, two experiments (EXP) were conducted to determine the apparent (AID) and standardized ileal digestibility (SID) of P in various inorganic phosphates and meat and bone meals (MBM) using the direct method. In both EXP 1 and 2, ileal samples were collected at 22 d post-hatch from birds fed semi-purified diets based on dextrose and corn starch containing test ingredients and one N and P free (NPF) diet for determination of ileal endogenous P losses (IEL). In EXP 1, diets containing monocalcium phosphate (MCP), dicalcium phosphate (DCP), monodicalcium phosphate (MDCP), defluorinated phosphate (DFP), bovine meat and bone meal (B-MBM), and porcine meat and bone meal (P-MBM) were formulated to 0.31% total P and balanced to 0.65% total Ca with limestone. Monosodium phosphate (MSP) was included at 3 levels to provide 0.13, 0.23, and 0.33% total P. Apparent ileal digestibility of P values were separated on two levels of statistical significance (P<0.01) with all dietary concentrations of MSP (92.57, 91.44, and 88.53%), MCP (89.55%), DCP (90.04%), and B-MBM (92.24%) having similar and higher values than DFP (73.59%), MDCP (76.58%), and P-MBM (77.31%). Endogenous P flow was determined to be 0.075 g/kg DMI. Experiment 2 determined AID and SID of P for MSP and 5 MBM of varying physical characteristics. The MSP diets were formulated to contain 0.31% total P and 0.67% total Ca with limestone and the MBM diets were formulated to 0.31% total P and contained no added limestone. The AID of P was highest (P<0.05) for MSP (87.49%), B-MBM 2 (86.34%), B-MBM 3 (86.88%), intermediate for B-MBM 1 (83.65%) and P-MBM (83.22%), and lowest for B-MBM 4 (75.60%). Endogenous P losses were determined to be 0.042 g/kg DMI. Although all sources were highly digestible (all >73%), no P source, including MSP, was totally available. Additional work is needed to establish the factors that influence ileal P digestibility among inorganic and animal protein sources.
Citation
Hampton, J. (2024). Determination of Ileal Digestible Phosphorous Values in Various Inorganic Sources Meat and Bone Meal Sources. Graduate Theses and Dissertations Retrieved from https://scholarworks.uark.edu/etd/5285