Article ; Online: Dietary crude protein reductions in wheat-based diets with two energy densities compromised performance of broiler chickens from 15 to 36 days post-hatch
Poultry Science 2023 July 16, v. 102, no. 10, p. 102932
2023 , Page(s) 102932
Abstract: This study was designed to investigate the impacts of 2 energy densities (13.0 and 12.5 MJ/kg ME) in wheat-based diets with 3 tiers of CP concentrations (210, 190, and 170 g/kg) on the performance of broiler chickens. The parameters assessed included ... ...
Abstract | This study was designed to investigate the impacts of 2 energy densities (13.0 and 12.5 MJ/kg ME) in wheat-based diets with 3 tiers of CP concentrations (210, 190, and 170 g/kg) on the performance of broiler chickens. The parameters assessed included growth performance (15–36 d posthatch), carcass traits, nutrient utilization, starch–protein digestive dynamics, apparent ileal amino acid digestibility coefficients, and the free amino acid and ammonia (NH₃) concentrations in systemic plasma. Also, the feasibility of substituting soybean meal with canola meal in 190 g/kg CP diets was investigated. The dietary CP reduction from 210 to 170 g/kg significantly compromised weight gain by 12.4% (1,890 vs. 2158 g/bird) and FCR by 5.33% (1.501 vs. 1.425). The 0.5 MJ energy density reduction compromised FCR by 3.25% (1.525 vs. 1.477; P = 0.013) in birds offered 170 g/kg CP diets. Reducing dietary CP and energy densities interactively influenced (P = 0.027) apparent metabolizable energy (AME) and nitrogen corrected metabolizable energy (AMEn) (P = 0.022) such that reducing dietary CP increased these parameters but reducing dietary energy densities decreased AME and AMEn. The 150 g/kg canola meal inclusion with the elimination of soybean meal displayed some promise. Dietary CP reductions (and increased nonbound amino acid inclusions) linearly associated with increased plasma ammonia (NH₃) concentrations (r = −0.607; P = 0.010) and plasma NH₃ was linearly related to depressed weight gains (r = −0.565; P = 0.018). The association of dietary non–protein-bound amino acid (NPBAA) inclusions and elevated plasma NH₃ concentrations have profound implications for the successful development of reduced-CP, wheat-based broiler diets. |
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Keywords | amino acids ; ammonia ; birds ; canola meal ; crude protein ; digestible amino acids ; energy ; energy density ; free amino acids ; growth performance ; ileum ; metabolizable energy ; nitrogen ; nutrient utilization ; poultry science ; soybean meal ; weight gain ; broiler ; protein ; wheat |
Language | English |
Dates of publication | 2023-0716 |
Size | p. 102932 |
Publishing place | Elsevier Inc. |
Document type | Article ; Online |
Note | Pre-press version |
ZDB-ID | 242586-5 |
ISSN | 1525-3171 ; 0032-5791 |
ISSN (online) | 1525-3171 |
ISSN | 0032-5791 |
DOI | 10.1016/j.psj.2023.102932 |
Database | NAL-Catalogue (AGRICOLA) |
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