Exigência de triptofano para frangos de corte de 1 a 21 dias de idade

Castro, Altivo José de; Gomes, Paulo Cézar; Pupa, Júlio Maria Ribeiro; Rostagno, Horácio Santiago; Albino, Luiz Fernando Teixeira; Nascimento, Adriana Helena

doi:10.1590/s1516-35982000000600021

Cited by 7 publications

(6 citation statements)

References 15 publications

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“…Castro et al (2000), evaluating broilers performance of broilers from 1 to 21 days of age fed different levels of total tryptophan (0.18 to 0.24%) and observed a quadratic effect on weight gain and feed conversion ratio, estimating the requirements on 0.212 and 0.208% of total tryptophan.…”

Section: Resultsmentioning

confidence: 99%

“…In order to evaluate the performance of broilers (1-21 days) fed different levels of total tryptophan, Castro et al (2000) reported that deficiency or excess of tryptophan negatively affect weight gain of broilers of both sexes. According to the authors, the difference observed in body weight gain of males compared with females makes it feasible to work with separate sexes, since males had higher weight gain.…”

Section: Resultsmentioning

confidence: 99%

“…Working with 49-day-old broilers fed different dietary levels of DTrp (0.14 to 0.20%), Castro et al (2000) reported a quadratic effect on the weight of eviscerated carcass, thigh and drumstick weight and boneless breast weight, with estimates of 0.170, 0.173 and 0.167% of total tryptophan.…”

Section: Resultsmentioning

confidence: 99%

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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: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Digestible tryptophan requirements of meat quails in the growth phase

Ton¹,

Furlan²,

Martins³

et al. 2012

R. Bras. Zootec.

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“…Superior results were verified by Castro et al (2000), who obtained, by quadratic regression, a minimum requirement for tryptophan broilers from 1 to 21 days of age of 0.212%. Hsia et al (2005) at the end of a series of experiments, found that the best performance was obtained by one whose tryptophan level was 0.198%.…”

Section: Resultsmentioning

confidence: 86%

Digestible tryptophan levels for male broilers in pre-starter and starter diets

Borges

Nunes

Strighini

et al. 2016

SCA

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The objective was to determine the digestible tryptophan requirements for male broilers in pre-starter and starter phases. Two experiments using 400 Cobb broilers were performed 200 males in the first experiment for the pre-starter phase (one to seven days old), and 200 males in the second experiment for the starter phase (eight to 21 days old). Chicks were housed in batter boxes made of galvanized steel as an experimental shed. The experiments were performed in a completely randomized design, with four treatments and five replicates, with ten birds each. In both experiments, the tryptophan requirement was determined using diets with different levels of digestible tryptophan. A tryptophan-deficient diet was formulated, as a basal diet, which was supplemented with increased levels of L-tryptophan in order to achieve the desirable digestible tryptophan levels. Treatments consisted of 0.209% (basal diet); 0.223%; 0.235% and 0.248% digestible tryptophan for the pre-starter phase (experiment 1) and 0.187% (basal diet); 0.200%, 0.211% and 0.223% digestible tryptophan for the starter phase (experiment 2). We evaluated feed intake, weight gain and feed conversion, as well as the metabolizability of feed nutrients. The performance and metabolic data were subjected to analysis of variance, and estimates of digestible tryptophan levels were made through polynomial regression models at 5% probability. There was no significant difference between the digestible tryptophan levels in the diet over performance and digestibility in both treatments. It is possible to conclude that the basal diet with 0.209% digestible tryptophan for the pre-starter phase and 0.187% for the starter phase, at a tryptophan: lysine ratio of 16%, as sufficient to meet the broilers requirements. Key words: Animal nutrition. Chickens. Digestible amino acid. Digestibility. Performance. ResumoObjetivou-se determinar as exigências de triptofano digestível para frangos de corte machos nas fases pré-inicial e inicial. Foram realizados dois experimentos utilizando 400 frangos de corte da linhagem Cobb, sendo o experimento 1 com 200 machos para a fase pré-inicial (um a sete dias de idade), e o 1 M.e em Ciência Animal, Escola de Medicina Veterinária e Zootecnia, EVZ, Universidade Federal de Goiás, UFG, Goiânia, GO,Brasil. E-mail: brunozootecnia22@hotmail.com 2 Profs., Pós-Graduação em Zootecnia, EVZ/UFG, Goiânia, GO, Brasil. E-mail: romaocnunes@hotmail.com; jhstring@uol.com. br; alegimenez09@hotmail.com; heloisamello@gmail.com 3 Discentes do Curso de Doutorado em Zootecnia, EVZ/UFG, Goiânia, GO, Brasil. E-mail: julyanamachado_zoo@hotmail.com; raianazoo@hotmail.com; mary_zoo@hotmail.com * Author for correspondence experimento 2 com 200 machos para a fase inicial (oito a 21 dias de idade), alojados em baterias, contendo gaiolas de arame galvanizado, em um galpão experimental. Os experimentos foram realizados em delineamento inteiramente casualizado, divididos em quatro tratamentos, com cinco repetições e dez aves por repetição, sendo que cada repetição com...

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“…Some previous studies have shown that dietary tryptophan levels could regulate feed intake, behavior, growth, immunity, protein synthesis and intestinal integrity of chicken (Corzo et al, 2005 andShen et al, 2012a, b). Castro et al (2000) observed that different levels of total tryptophan (0.18 to 0.24%) supplementation on diet of broilers from 1 to 21 days of age effect on weight gain and feed conversion ratio, estimating the requirements on 0.212 and 0.208% of total tryptophan. (Rosa and Pesti 2001, Fraiha 2002and Tabiri et al, 2002, reported that the level of 0.25% tryptophan supplementation is necessary to maximize feed intake.…”

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confidence: 99%

Effect of Different Levels of Tryptophan Supplementation on Growth Performance and Some Blood Constituents of Sinai Bedouin Chicks

Soltan

Hussein

2017

Egyptian Journal of Nutrition and Feeds

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total of one hundred and twenty, unsexed Sinai Bedouin chicks, one day old were used in this experiment. Chicks were allocated to four dietary treatments of thirty chicks which included three replicates of ten chicks. The experiment lasted for 16 weeks. Growth performance parameters, some blood parameters and economical efficiency were determined. The first group (T 1 , control basal diet content normal level of tryptophan supplementation, T 2, T 3 and T 4 contented the supplementation of tryptophan at the levels of 0.20,0.25 and 0.30%, respectively. Results were indicated that body weight and body weight gain were significantly (P ≤ 0.05) increased by increasing of tryptophan level. The best of feed conversion ratio was recorded for treatment four supplied with 0.30% tryptophan compared with other treatments. Chicks fed diet supplemented with tryptophan were significantly increased in plasma glucose, Total protein and globulin concentration. No significant differences were noted in transaminase enzymes (ALT and AST) plasma blood concentration between all treatments. Significant decrease was observed in plasma total lipids and total cholesterol with adding tryptophan levels (0.20, 0.25 and 0.30%) compared with the basal diets. Tryptophan supplementation at levels (0.20, 0.25 and 0.30%) to chick's diet improved economical efficiency. In conclusion, supplementing tryptophan to Beduin Sinai chick's (during growth period) diet had a positive effect on growth performance and some blood constituents, especially addition 0.30% tryptophan could be recommended for improving Sinai Bedouin chick's health and economic efficiency.

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Exigência de triptofano para frangos de corte de 1 a 21 dias de idade

Cited by 7 publications

References 15 publications

Digestible tryptophan requirements of meat quails in the growth phase

Digestible tryptophan requirements of meat quails in the growth phase

Digestible tryptophan levels for male broilers in pre-starter and starter diets

Effect of Different Levels of Tryptophan Supplementation on Growth Performance and Some Blood Constituents of Sinai Bedouin Chicks

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