Digestible tryptophan requirements for broilers from 22 to 42 days old

Duarte, Karina Ferreira; Junqueira, Otto Mack; Filardi, Rosemeire da Silva; Siqueira, Jefferson Costa de; Puzotti, Maíra Mangili; Garcia, Edivaldo Antônio; Molino, Andréa de Britto; Laurentiz, Antônio Carlos de

doi:10.1590/s1516-35982013001000006

Cited by 20 publications

(11 citation statements)

References 14 publications

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“…Similarly, no effect was noticed on carcass traits. These findings are supported by the previous studies (Duarte et al 2013;Mr & Azam, 2014) in which Trp supplementation had similar response. The similar result for feed intake (Rosebrough, 1996) reported that the feed intake was decreased when broiler chicken was fed by the diet containing low crude protein and excess level of Trp supplement.…”

Section: Discussionsupporting

confidence: 90%

“…The similar result for feed intake (Rosebrough, 1996) reported that the feed intake was decreased when broiler chicken was fed by the diet containing low crude protein and excess level of Trp supplement. Duarte et al (2013) also concluded that Trp had no effect on feed intake in broiler chicken. This result might be due to the crude protein (18.4%) in diet.…”

Section: Discussionmentioning

confidence: 99%

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Effect of dietary tryptophan supplementation on growth performance, immune response and anti‐oxidant status of broiler chickens from 7 to 21 days

Mund

Riaz

Mirza

et al. 2019

Veterinary Medicine & Sci

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Background This study was conducted to investigate the optimum dietary level of tryptophan (Trp) supplementation at which broiler chickens have better growth with efficient immune system and anti‐oxidant status. Method One hundred and twenty (n = 120) 1‐day‐old broiler chicks were fed a common commercial diet from days 1 to 7. On day 7, the chicks were randomly divided in three treatment groups, that is, Trp 0.2 [national research council (NRC) recommended level of tryptophan], Trp 0.3 (tryptophan supplemented at 0.3%) and Trp 0.5 (tryptophan supplemented at 0.5%). All the experimental diets were iso‐caloric (ME; 3,000 kcal/kg) and iso‐proteic (CP; 18.5%). Weekly data on feed intake and body weight gain (BWG) were recorded to calculate feed conversion ratio (FCR). On day 19, avian tuberculin was injected to note the cellular immunity. On day 21, two birds per replicate were killed to determine carcass and visceral organ weights. Blood serum samples were collected for analysis of humoral immune response against sheep red blood cells, total oxidant and anti‐oxidants by spectrophotometric method. Results Feed intake, carcass and visceral organ weights remained unaffected by dietary treatments while BWG and FCR tended to improve (p < .05) in broiler chicks fed the Trp 0.3 and the Trp 0.5 diets. Total oxidant status was also improved (p < .05) in broiler chicks fed the Trp 0.5 diet. Likewise, broiler chicks fed the Trp 0.3 and the Trp 0.5 diets tended to have better (p < .05) total anti‐oxidant status, catalase, glutathione peroxidase, glutathione reductase and arylesterase (ARE). The overall antibodies response and IgG improved (p < .05) by the Trp 0.3 and Trp 0.5 diets compared to control. However, IgM level remained similar across the treatment. The cellular immunity against avian tuberculin improved at 24 hr post‐injection but its effect disappeared at 48 hr. Conclusion The results of present study revealed that Trp above the NRC recommended level may give better growth, immune response and anti‐oxidant status in broiler chickens.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Effect of dietary tryptophan supplementation on growth performance, immune response and anti‐oxidant status of broiler chickens from 7 to 21 days

Mund

Riaz

Mirza

et al. 2019

Veterinary Medicine & Sci

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“…Also Corzo (2012) reported that Body weight gain, feed consumption, and feed conversion responses of Cobb 500 male broiler chicks fed increasing dietary ratios of Tryptophan: Lysine (19.5 and 19.7% %) from 0 to 18 d post hatch. ( Patil et al, 2013;Duarte, et al, 2013 andWong et al, 2014) who found that supplementation tryptophan level of broiler diet improvement in feed conversion ratio of birds. Emmanuel et al (2016) found that chicks fed 0.15% total dietary tryptophan had significantly higher (p<0.05) value for feed intake (1,789.90 g).…”

Section: Results Inmentioning

confidence: 99%

“…(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. Duarte et al (2013) noted that the level of 0.23% of digestible tryptophan numerically improves feed conversion.…”

mentioning

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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“…Treatments consisted of a isoleucine-deficient basal diet, formulated with digestible amino acids, according to the ideal protein concept, or rather, from 22 to 42 days of age, supplemented with five different digestible isoleucine levels, using 0.7642% of digestible threonine, 0.1919% of digestible tryptophan and 0.8802 of digestible valine, following Duarte et al (2014); Duarte et al (2012); Duarte et al (2013), respectively.…”

Section: Animals and Experimental Proceduresmentioning

confidence: 99%

<b>Digestible isoleucine requirements for 22- and 42-day-old broilers

Duarte

Junqueira

Filardi

et al. 2015

Acta Sci. Anim. Sci.

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ABSTRACT. Current experiment established different criteria to evaluate the requirements of digestible isoleucine for 22-and 42-day-old broilers by different regression models (quadratic, exponential and Linear Response Plateau) and, in the case of statistical significance, the comparison of means by Duncan's test at 5% probability. A total of 1,920 Cobb 500 male broilers were used in an entirely randomized experimental design, with 6 treatments (6 digestible isoleucine levels: 0.6118; 0.6655; 0.7192; 0.7729; 0.8265 and 0.8802%) and 8 replications, with 40 broilers each. Data on performance and carcass characteristics were evaluated. Level 0.7192% of digestible isoleucine was considered standard. The digestible isoleucine level recommended for 22-and 42-day-old broilers is 0.7729%, corresponding to a digestible isoleucine:lysine ratio of 72%.Keywords: digestible amino acids, ideal protein, performance, regression analyses.Exigências em isoleucina digestível para frangos de corte de 22 a 42 dias de idade RESUMO. Um experimento foi realizado com o objetivo de estabelecer critérios de avaliação das exigências de isoleucina digestível para frangos de corte de 22 a 42 dias de idade utilizando-se diferentes modelos de regressão (quadrático, exponencial e de retas segmentadas ou Linear Response Plateau) e em caso de significância estatística, as médias foram comparadas pelo teste de Duncan a 5 % de probabilidade. Foram utilizados 1.920 frangos de corte machos com 22 dias de idade, em delineamento inteiramente ao acaso, com seis tratamentos (seis níveis de isoleucina digestível: 0,6118; 0,6655; 0,7192; 0,7729; 0,8265 e 0,8802%) e oito repetições de 40 aves. Utilizou-se como padrão o nível de 0,7192% de isoleucina digestível. O nível de isoleucina digestível recomendado para frangos de corte de 22 a 42 dias de idade é 0,7729%, correspondente à relação isoleucina:lisina digestível de 72%.Palavras-chave: aminoácidos digestíveis, proteína ideal, desempenho, análises de regressão.

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Digestible tryptophan requirements for broilers from 22 to 42 days old

Cited by 20 publications

References 14 publications

Effect of dietary tryptophan supplementation on growth performance, immune response and anti‐oxidant status of broiler chickens from 7 to 21 days

Effect of dietary tryptophan supplementation on growth performance, immune response and anti‐oxidant status of broiler chickens from 7 to 21 days

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

<b>Digestible isoleucine requirements for 22- and 42-day-old broilers

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