Title: | Using crystalline amino acids to supplement broiler chicken requirements in reduced protein diets |
Contributor(s): | Hilliar, M (author) ; Hargreave, G (author); Girish, C K (author); Barekatain, R (author); Wu, S-B (author) ; Swick, R A (author) |
Publication Date: | 2020-03 |
Early Online Version: | 2020-01-30 |
Open Access: | Yes |
DOI: | 10.1016/j.psj.2019.12.005 |
Handle Link: | https://hdl.handle.net/1959.11/29318 |
Abstract: | | Reducing dietary CP can reduce N pollution. Much research has been reported in corn-based diets; however, the amino acid (AA) profiles of wheat-based diets differ. Poor performance as a result of reduced protein (RP) has been overcome in corn-based diets with essential AA and glycine (Gly) supplementation. The current study examined RP levels and Gly in wheat-based diets. An industry standard protein (SP) diet plus 3 RP diets with and without Gly supplementation, to match the SP treatment at 0.713 and 0.648% digestible Gly for the grower and finisher periods respectively, were fed to male broilers from day 10 of age. Grower CP included 22.5, 20.6, 18.3, and 17.7% (days 10-21) and finisher CP included 19.7, 17.8, 16.2, and 15.5% (days 21-35). Performance, meat yield, N efficiency, water intake, and apparent ileal digestibility of N and AA were measured. No difference in body weight gain (BWG), feed intake, or feed conversion ratio (FCR) were observed at 20% CP compared to the SP treatment. However, further reducing protein reduced BWG (P < 0.001), feed intake (P < 0.001), and increased FCR (P < 0.001). Supplementation of 0.713% Gly in the grower period increased BWG (P < 0.001) and reduced FCR (P < 0.001). Relative meat yield was not affected by dietary protein, however reducing CP increased relative fat pad weight (P < 0.001). Nitrogen efficiency increased with decreased CP in both grower (R2 = 0.69) and finisher (R2 = 0.80) treatments. Water intake decreased (R2 = 0.83) with decreasing CP intake. Apparent ileal digestibility of AA and N were higher in RP diets (P < 0.05). The benefits of reduced water intake and increased N efficiency and the disadvantages of poor performance and increased body fat in RP corn-based diets have been identified in RP wheat-based diets. Furthermore, at 18.5% CP the supplementation of crystalline AA and Gly can maintain BWG and FCR observed in SP diets.
Publication Type: | Journal Article |
Source of Publication: | Poultry Science, 99(3), p. 1551-1563 |
Publisher: | Elsevier BV |
Place of Publication: | Netherlands |
ISSN: | 1525-3171 0032-5791 |
Fields of Research (FoR) 2008: | 070204 Animal Nutrition |
Fields of Research (FoR) 2020: | 300303 Animal nutrition |
Socio-Economic Objective (SEO) 2008: | 830309 Poultry |
Socio-Economic Objective (SEO) 2020: | 100411 Poultry |
Peer Reviewed: | Yes |
HERDC Category Description: | C1 Refereed Article in a Scholarly Journal |
Appears in Collections: | Journal Article School of Environmental and Rural Science
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