Exigências de triptofano e padrão de recuperação do desempenho de poedeiras comerciais após alimentação com rações deficientes em triptofano

Deponti, Bruno José; Faria, Douglas Emygdio de; Filho, Daniel Emygdio de Faria; Rombola, Luiz Gustavo; Araujo, Lúcio Francelino; Junqueira, Otto Mack

doi:10.1590/s1516-35982007000600014

Cited by 5 publications

(2 citation statements)

References 14 publications

(32 reference statements)

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“…Similar responses were reported by Deponti et al (2007), who found no effect on feed intake and feed efficiency with increased levels of tryptophan (0.13 to 0.21) for laying hen diets. The authors concluded that the lowest level (0.13%) was not low enough to suppress feed intake.…”

Section: Resultssupporting

confidence: 87%

Digestible tryptophan requirements of meat quails in the growth phase

Ton¹,

Furlan²,

Martins³

et al. 2012

R. Bras. Zootec.

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-The objective of this experiment was to estimate the digestible tryptophan (DTrp) requirements for growing meat quails. In the first experiment (1-14 days of age), 1,950 quails were distributed in a completely randomized design, with six levels of DTrp (0.27; 0.30; 0.33; 0.36; 0.39 and 0.42% of diet), five replications and 65 quails per experimental unit.There was a linear increase of feed intake, tryptophan intake, weight gain and body weight with the DTrp levels increase. In the second experiment (15-35 days of age), 1,350 quails were distributed in a completely randomized design, with six levels of DTrp (0.22; 0.25; 0.28; 0.31; 0.34 and 0.37% of diet), five replications and 45 quails per experimental unit. There was a linear increase for tryptophan intake, carcass yield, ash levels and protein deposition rate with the DTrp levels increase.In the third experiment (28-35 days of age), conducted to determine the nitrogen balance, 150 males were housed in galvanized wire cages featuring drinker, feeder and individual metal tray lined with plastic to collect the excreta. The design was completely randomized, with six levels of DTrp (0.22; 0.25; 0.28; 0.31; 0.34 and 0.37% of diet), five replicates and five quails per experimental unit. Linear decrease was observed on the nitrogen balance and metabolization coefficient with the DTrp levels increase. The nutritional requirement of digestible tryptophan for maximum growing of meat quail, in the period from 1 to 14 days of age, is higher or equal to 0.42%; in the period from 15 to 35 days, it is 0.22%.

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Section: Resultssupporting

confidence: 87%

Digestible tryptophan requirements of meat quails in the growth phase

Ton¹,

Furlan²,

Martins³

et al. 2012

R. Bras. Zootec.

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“…Tryptophan is considered the third limiting amino acid in diets based on corn and soybean meal for laying hens (Russell & Harms, 1999;Harms & Russell, 2000;Peganova et al, 2003;Deponti et al, 2007). However, few studies have been conducted to determine the requirement of digestible tryptophan and especially its ideal ratio with digestible lysine in diets for laying hens.…”

Section: Introductionmentioning

confidence: 99%

Digestible tryptophan:digestible lysine ratio in diets for laying hens from 24 to 40 weeks of age

Calderano¹,

Gomes²,

Donzele³

et al. 2012

R. Bras. Zootec.

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-The objective of this study was to determine the ideal digestible tryptophan:digestible lysine ratio in diets for laying hens from 24 to 40 weeks of age. Two hundred and forty Hy-Line W-36 laying hens at 24 weeks of age were distributed in a completely randomized design, with five treatments, eight replicates and six birds per experimental unit. The digestible tryptophan levels in the experimental diets were 1.57; 1.68; 1.79; 1.90 and 2.01 g/kg, providing ratios of digestible tryptophan:digestible lysine of 0.215; 0.230; 0.245; 0.260 and 0.275. The increase in the levels of digestible tryptophan in the diet linearly improved the feed intake, digestible tryptophan intake, digestible lysine intake, egg production, egg mass, feed conversion per egg mass and utilization efficiency of digestible lysine for eggs mass. There were quadratic effects from the digestible tryptophan levels on egg weight. For the efficiency of utilization of digestible lysine for egg mass, there was better adjustment of the data to the LRP model. The level of digestible tryptophan in the diet from which the plateau occurred was 0.184%. This level corresponded to the intake of 142 mg/bird/day of digestible tryptophan and digestible tryptophan:digestible lysine ratio of 0.252. The ideal digestible tryptophan:digestible lysine ratio recommended in diets for laying hens from 24 to 40 weeks of age is 0.252 (25.2%).

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Digestible tryptophan:lysine ratio for laying hens

et al. 2012

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-The objective of this study was to evaluate the requirement of digestible tryptophan for white laying hens in the production stage fed diets of different digestible tryptophan:digestible lysine ratios, as well as animal performance and histological alterations in their reproductive and digestive systems. A total of 280 white laying hens at 29 weeks of age were distributed in a completely randomized design with five treatments and seven replications with eight birds in each. The treatments consisted of a base feed, formulated with corn, soybean meal and corn gluten meal, and supplemented with the synthetic amino acids L-lysine, DL-methionine, L-threonine, L-isoleucine, L-arginine, and L-valine, so as to meet the nutritional requirements for laying hens, except for digestible tryptophan. The basal diet was supplemented with 0.00; 0.017; 0.035; 0.052; and 0.069 g/kg of L-tryptophan in substitution for corn starch with the objective of reaching the levels of 0.151; 0.167; 0.183; 0.199; and 0.215 g/kg of digestible tryptophan in the feed. For the ratio between digestible amino acids and lysine, the recommendation of Brazilian Tables for Poultry and Swine was followed, except for the digestible tryptophan: digestible lysine ratios, which were 19, 21, 23, 25 and 27 for each treatment. The variation in the digestible tryptophan: digestible lysine ratio promoted changes in performance and in the histological characteristics, improving the results. The digestible tryptophan:digestible lysine ratio of 24.5% in the feed of white laying hens in production stage promotes better animal performance and histological results.

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Exigências de triptofano e padrão de recuperação do desempenho de poedeiras comerciais após alimentação com rações deficientes em triptofano

Cited by 5 publications

References 14 publications

Digestible tryptophan requirements of meat quails in the growth phase

Digestible tryptophan requirements of meat quails in the growth phase

Digestible tryptophan:digestible lysine ratio in diets for laying hens from 24 to 40 weeks of age

Digestible tryptophan:lysine ratio for laying hens

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