Nutritional requirement of digestible tryptophan for white-egg layers of 60 to 76 weeks of age

Cardoso, Anilma Sampaio; Costa, Fernando Guilherme Perazzo; Silva, José Humberto Vilar da; Saraiva, Edílson Paes; Nogueira, Eduardo Terra; Santos, Clariana Silva; Lima, Matheus Ramalho de; Vieira, Danilo Vargas Gonçalves

doi:10.3382/japr.2014-01012

Cited by 7 publications

(10 citation statements)

References 12 publications

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“…Although there were no statistical differences among diets of 148 mg/d and above, there was a 1.7 percentage point increase in egg production. These results are consistent with previous research ( Harms and Russell, 2000 ; Wen et al., 2019 ), whereas others found that egg production followed a quadratic pattern where egg production began to decrease at 0.19 and 0.20% or 210 mg/d and 181 mg/d, respectively ( Jensen et al., 1990 ; Cardoso et al., 2014 ). As expected, low digestible Trp diets had a 7.7 percentage point reduction in egg production compared with the diets with the highest dietary digestible Trp concentration.…”

Section: Resultssupporting

confidence: 93%

“…Egg mass and feed efficiency responded similarly as both increased until approximately the 162 mg/d Trp treatments with no additional improvements above that treatment. These results are generally consistent with egg mass and FE results from previous reports ( Bregendahl et al., 2008 ; Cardoso et al., 2014 ; Wen et al., 2019 ).…”

Section: Resultssupporting

confidence: 93%

“…Although Trp in the diet had a significant effect on the egg weight ( P ≤ 0.01), no clear pattern was observed, and the biological relevance of this response is questionable. The literature is also inconsistent regarding the effect of Trp on egg weights with reports of a dose response effect on egg weights ( Russell and Harms, 1999 ; Wen et al., 2019 ) and other reports ( Jensen et al., 1990 ; Cardoso et al., 2014 ) without differences in egg weights with various dietary Trp concentrations.…”

Section: Resultsmentioning

confidence: 99%

“…However, the issue that is faced with quadratic polynomial is that it lacks a clear plateau for determining requirements and after the maximum response is achieved, the response falls rapidly which is not consistent with biological data. Furthermore, there are differences in where the requirement should be estimated as some reports have used 95% of the maximum response ( Wen et al., 2019 ) whereas others ( Pesti et al., 2009 ; Cardoso et al., 2014 ) have used the maximum response. The quadratic polynomial resulted in estimates of 192, 183, and 173 mg/d of digestible Trp at 95% of the maximum response for HHEP, egg mass, and feed efficiency, respectively.…”

Section: Resultsmentioning

confidence: 99%

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Tryptophan requirement of first-cycle commercial laying hens in peak egg production

et al. 2021

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An experiment was conducted to evaluate the digestible tryptophan (Trp) requirement of laying hens from 22 to 34 wk of age. A total of 252 Hy-line W-36 laying hens were selected at 16 wk of age and allocated by weight ( P = 0.90) to 7 dietary treatments resulting in 12 replicate cages of 3 birds for each treatment. A Trp-deficient basal diet was formulated using corn, corn gluten meal, and soybean meal for each of the 3 dietary phases and supplemented with synthetic L-Trp to provide 105, 119, 133, 147, 162, 176, and 190 mg digestible Trp on a daily basis over the experimental period. To adapt the hens to experimental diets, pullets were fed complete diets that contained increasing amounts of corn gluten meal. Hens received a controlled amount of feed daily based on feed intake expected under commercial conditions. Linear and quadratic broken-line, and quadratic polynomial models were used to estimate digestible Trp requirements based on hen-housed egg production (HHEP), egg mass (EM), and feed efficiency (FE). FE was calculated using EM and feed intake. Digestible Trp requirements were estimated to be 137, 183, and 192 mg/d for HHEP; 133, 180, and 183 for EM and 133, 177, and 173 for FE using linear broken-line, quadratic broken-line, and quadratic polynomial analysis, respectively. The quadratic broken line model in this experiment resulted in the best fit (R 2 ) for all parameters measured. Linear broken line estimates resulted in lower estimates that the other models, and HHEP resulted in higher estimated digestible Trp requirement than EM and FE.

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Section: Resultssupporting

confidence: 93%

Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Tryptophan requirement of first-cycle commercial laying hens in peak egg production

et al. 2021

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“…However, the relative weight of quail eggs is higher, and may reach 10% of body weight. The weight of eggs of quails has a mean value of 12 g [17][18][19][20] and eggs of laying hens around 65 g [21][22][23][24].…”

Section: Peculiaritiesmentioning

confidence: 99%

Amino Acid for Japanese Quails: Methodologies and Nutritional Requirement

Vieira¹,

Costa²,

Lima³

et al. 2017

Amino Acid - New Insights and Roles in Plant and Animal

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The methodologies applied to chickens and laying hens, to determine the digestibility and requirement of protein and amino acids are used with quails, however, they need a more careful evaluation due to peculiarities inherent to the Coturnix genus, in order to provide consistent results. The nutritional requirements of the birds are determinate using the dose-response and the factorial method. Several mathematical models and techniques of diet formulation are allied to the dose-response method in determining nutritional requirements. The curvilinear (hyperbolic) models beter portray population behaviour in response to increasing nutrient doses in diets. The reading model, allow a beter estimation of the requirement, in relation to the mathematical models used in the dose-response method. The techniques of comparative slaughter and nitrogen balance are efective in determining the nutritional requirements of quails, however, the later need to be corrected by the loss of nitrogen in the feathers in determining the requirements of crude protein and amino acids for maintenance. The protein-free diet, coupled with the industrial amino acid supplementation, provides more robust digestibility values, since it more efectively predicts the endogenous excretion patern.

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Effects of dietary tryptophan levels on growth performance, serotonin metabolism, brain 5-HT and cannibalism activities in tiger puffer, Takifugu rubripes fingerlings

Wei,

Zhou,

Zhang

et al. 2024

Aquaculture

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Nutritional requirement of digestible tryptophan for white-egg layers of 60 to 76 weeks of age

Cited by 7 publications

References 12 publications

Tryptophan requirement of first-cycle commercial laying hens in peak egg production

Tryptophan requirement of first-cycle commercial laying hens in peak egg production

Amino Acid for Japanese Quails: Methodologies and Nutritional Requirement

Effects of dietary tryptophan levels on growth performance, serotonin metabolism, brain 5-HT and cannibalism activities in tiger puffer, Takifugu rubripes fingerlings

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