Nutritional requirement of tryptophan for meat-type Japanese quails: Performance and carcass attributes

Mehri, Mehran; Pajouhanfar, Hadi; Sabaghi, Vahideh; Bazzi, Hossein

doi:10.1016/j.anifeedsci.2021.115136

Cited by 4 publications

(6 citation statements)

References 24 publications

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“…Increasing dietary Trp bene cially increased IgG, SRBC-antigen titer, the relative weight of BF, and WHC whereas decreased the levels of ALP, UA, and TG in blood and also decreased drip loss and MDA concentration in meat samples. The basic mechanism of the bene cial effects of dietary Trp may be related to the antioxidant property of this aromatic amino acid as previously indicated by Mehri, et al 13 and Khanipour, et al 5 in quail nutrition. These researchers postulated that Trp along with its metabolites may play an integrated role in antioxidant and immunity systems of the body through regulating cytochrome P450 in the liver.…”

Section: Discussionmentioning

confidence: 72%

“…Bird management and experimental diets. As described by Mehri, et al 13 , the basal diet consisting of wheat, soybean meal, corn, and corn gluten meal was mixed and formulated to provide an adequate concentration of all nutrients for growing Japanese quails, except Trp (Table 1), which was supplemented with 7 concentrations of L-Trp at the expense of cornstarch providing a range of dietary Trp from 2.12 to 2.90 g/kg of diet with 0.13 g/kg increments. Quail chicks were fed ad libitum throughout the trial and had free access to the water from 21 to 35 d of age.…”

Section: Discussionmentioning

confidence: 99%

“…The continuous data need to be tted by regression models either with linear or quadratic patterns. Among different mathematical models, broken line models are the most prevalent models for determination of nutrient requirements in mammals and poultry [6][7][8][9][10][11][12][13][14] . In general, the broken line models consisted of one or two slope sections and each section may follow the linear and/or quadratic manners in ascending and/or descending orders 6-8, 15 .…”

Section: Introductionmentioning

confidence: 99%

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Physiological and statistical aspects of immunoregulatory and antioxidant properties of tryptophan

Pajouhanfar

Ghazaghi

Mehri

2022

Preprint

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Tryptophan (Trp) is the third or fourth limiting amino acid for the most poultry species fed on corn-soybean meal-diets, playing an important role in the profile of the blood biochemical variables, humoral immunity, and antioxidant capacity. A dose-response assay was carried out to investigate the effects of graded levels of dietary Trp on blood variables, immunity and meat quality in quail chicks during the last two weeks of growing period. A total of 420, 21-day-old quail chicks were randomly distributed across the seven experimental groups (i.e., 2.12, 2.25, 2.38, 2.51, 2.64, 2.77, and 2.90 g Trp /kg of diet) with 4 pen replicates of 15 birds each. Blood variables including uric acid (UA), albumin (ALB), and triglycerides (TG) responded inversely to increasing dietary Trp (P < 0.001). Blood concentration of aspartate aminotransferase (AST), relative weight of bursa of Fabricius (BF), immunoglobulin G (IgG), water holding capacity (WHC), and antigen production against the sheep red blood cells (SRBC) increased with increases in dietary Trp (P < 0.001). In contrast, the concentration of malondialdehyde (MDA) and drip loss in meat samples decreased with increasing dietary Trp (P < 0.001). The best models for determination of optimal dietary Trp were selected based on a statistical merit called model accuracy index (δ). The optimal amounts of dietary Trp for optimizing ALP, UA, total protein (TP), TG, SRBC, IgG, BF, drip loss, WHC, and MDA were estimated at 2.347, 2.371, 2,372, 2.485, 2,691, 2.738, 2.306, 2.359, 2.247, and 2.500 g/kg of diet, respectively. Principal component analysis showed that UA, TG, IgG, and drip loss had the higher association with dietary Trp compared to the rest responses. Taking into account of high δ and eigenvalues for fitted bird responses, the more reliable estimation of optimal Trp for optimization of studied responses in quail chicks would be 2.738 g Trp/kg of diet, which was significantly higher than that recommended for the quail performance.

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Section: Discussionmentioning

confidence: 72%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Physiological and statistical aspects of immunoregulatory and antioxidant properties of tryptophan

Pajouhanfar

Ghazaghi

Mehri

2022

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…As described by Mehri et al [ 13 ], the basal diet consisting of wheat, soybean meal, corn, and corn gluten meal was mixed and formulated to provide an adequate concentration of all nutrients for growing Japanese quails, except Trp ( Table 1 ), which was supplemented with 7 concentrations of L-Trp at the expense of cornstarch providing a range of dietary Trp from 2.12 to 2.90 g/kg of diet with 0.13 g/kg increments. Quail chicks were fed ad libitum throughout the trial and had free access to the water from 21 to 35 d of age.…”

Section: Methodsmentioning

confidence: 99%

“…All data analyses including one-way ANOVA, one-sample t -test, spline regression analysis [ 13 ], and principal components analysis (PCA) were employed by GraphPad Prism software, version 9.3.1. The mean differences were analyzed by Tukey's multiple comparison tests at P < 0.05.…”

Section: Methodsmentioning

confidence: 99%