Respostas de frangos de corte a aumentos graduais na relação entre treonina e lisina

Berres, Josemar; Vieira, S. L.; Coneglian, Jorge Luis Bernardon; Olmos, Alexandra Reali; Freitas, Dimitri Moreira de; Bortolini, Tatsi Carolina Kowal; Silva, Guilherme Xavier da

doi:10.1590/s0103-84782007000200033

Cited by 15 publications

(8 citation statements)

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“…Esses valores estão de acordo com os observados por Kidd & Kerr (1996) e Dionizio et al (2003), mas foram superiores aos 67% sugeridos por Baker & Han (1994), aos 63% encontrados por Soares et al (1999), aos 57% e 65% sugeridos por Rostagno et al (2000) e Rostagno et al (2005), respectivamente, e aos 68,5% obtidos por Emmert & Baker (1997) indicaram a relação de 60% como ideal para atender às exigências das aves. Berres et al (2007) recomendaram a relação treonina:lisina de 68,5% para frangos de corte de 15 a 37 dias de idade. Webel et al (1996), utilizando rações com 20% de proteína bruta, encontraram o valor de 0,70% de treonina total para máximo desempenho de frangos de corte machos no período de 22 a 42 dias de idade.…”

Section: Resultsunclassified

“…Em dietas basais, é tipicamente o terceiro aminoácido limitante para frangos de corte, após metionina + cistina e lisina e seu nível nutricional mínimo pode estabelecer o nível de proteína bruta da dieta se não for utilizada a forma sintética (Berres et al, 2007). Deficiência em treonina em rações para frangos de corte pode diminuir a eficiência de utilização da metionina + cistina e da lisina (Atencio et al, 2004).…”

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Exigências em treonina para frangos de corte de 22 a 42 dias de idade

et al. 2012

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Um experimento foi realizado com o objetivo de estabelecer critérios de avaliação das exigências de treonina 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). Foram utilizados 1.920 frangos de corte machos com 22 dias de idade, distribuídos em delineamento inteiramente ao acaso, com seis tratamentos (seis níveis de treonina digestível: 0,5904; 0,6441; 0,6977; 0,7514; 0,8051 e 0,8588%) e oito repetições de 40 aves. Utilizou-se como padrão o nível de 0,6977% de treonina digestível. Foram avaliados dados de desempenho e características de carcaça. Com base nos dados, o nível de 0,7642% de treonina digestível, correspondente às relação treonina:lisina digestível de 71,19%, promoveu o melhor resultado de conversão alimentar de acordo com o modelo Linear Response Plateau.

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Section: Introductionunclassified

Exigências em treonina para frangos de corte de 22 a 42 dias de idade

et al. 2012

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“…Threonine is the third limiting amino acid for broilers after methionine and lysine in diets based on corn and soybean meal (Fernandez et al, 1994;Berres et al, 2007). It is a critical factor in least-cost formulations, and its supplementation allows reducing dietary crude protein levels, Digestible Threonine Levels in the Starter Diet of Broilers Derived from Breeders of Different Ages thereby contributing to reduce uric acid and water excretion, which consequently decreases nitrogen excretion in the environment (Kidd et al, 2002;Kidd et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Digestible Threonine Levels in the Starter Diet of Broilers Derived from Breeders of Different Ages

Tanure

Santos

Oliveira

et al. 2015

Rev. Bras. Cienc. Avic.

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The aim of this study was to evaluate the effect of digestible threonine supplementation in the starter diet on the performance, intestinal parameters, and nutrient metabolism of broilers derived from breeders of different ages. In total, 480 one-day-old Cobb chicks, derived from 38-or 49-week-oldbreeders, were housed in experimental battery cages until 21 days of age and fed four different threonine levels (800, 900, 1,000, or 1,100 mg/kg) in the starter feed. A completely randomized experimental design in a 2x4 factorial arrangement (breeder age x threonine levels) was applied, totaling eight treatments with five replicates of 12 birds each. Broilers from older breeders fed 800 mg digestible threonine/kg of diet presented higher weight gain, with a positive linear effect. There was also an interaction between breeder age and threonine levels for the weight gain of 21-d-old broilers supplemented at maximum level of 1,003 mg Thr/kg diet during the starter phase. There was no effect of breeder age or threonine levels on nutrient metabolism during the period of 17-21 days. There was no influence of breeder age or threonine levels in the starter diet on intestinal morphometric measurements, absorption area, or percentage of goblet cells.

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“…All vegetable feeds based on corn and soybeans present methionine, lysine and threonine as the first three limiting AA (Berres et al, 2007). These are the only commercially available AA to be supplemented in broiler feeds to date (Vieira et al, 2006).…”

Section: Resultsmentioning

confidence: 99%

Responses of fast and slow growth broilers fed all vegetable diets with variable ideal protein profiles

et al. 2010

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-One thousand eight hundred and ninety male broilers of two strain crosses (fast and slow initial growth) were fed different ideal protein profiles in four-phase feed programs: 1 to 7, 8 to 21, 22 to 34 and 35 to 40 days of age. All vegetable, corn-soybean meal feeds were formulated to maintain the Met+Cys:Lys and Thr:Lys relationships at 75 and 65%, respectively, on true digestible basis. Three ideal protein profiles were used: low, medium and high. From 1 to 21 days of age, half of the birds fed low and high diets were changed to high and low diets, respectively. Birds on the medium diet were kept on the same diet until the end of the study. A 3 × 2 (ideal protein profile x strain cross) factorial design was used for the period from 1 to 21 days and a 5 × 2 design thereafter. Carcass and commercial cuts were performed at 34 and 40 days of age to determine corresponding live weight and carcass yields. In general, the fast strain growth was superior in comparison to the low one when live performance and carcass and commercial cuts were evaluated. Live performance was positively affected by the increases in the dietary protein profiles; however, processing yield parameters could not be related with the dietary parameters. The low diets, which have similar protein contents to those used in some integrations, were shown to produce poor responses and, therefore are not recommended for broilers from 1 to 40 days of age. Alternating low and high ideal protein profiles at 21 days could result in similar feed conversions, and therefore, can lead to production cost reduction.

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Respostas de frangos de corte a aumentos graduais na relação entre treonina e lisina

Cited by 15 publications

References 14 publications

Exigências em treonina para frangos de corte de 22 a 42 dias de idade

Exigências em treonina para frangos de corte de 22 a 42 dias de idade

Digestible Threonine Levels in the Starter Diet of Broilers Derived from Breeders of Different Ages

Responses of fast and slow growth broilers fed all vegetable diets with variable ideal protein profiles

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