Exigências de treonina para frangos de corte machos nas fases de 1 a 20, 24 a 38 e 44 a 56 dias de idade

Atencio, A.; Albino, Luiz Fernando Teixeira; Rostagno, Horácio Santiago; Oliveira, J. E. de; Vieites, Flávio Medeiros; Donzele, Juarez Lopes

doi:10.1590/s1516-35982004000400008

Cited by 9 publications

(2 citation statements)

References 11 publications

(20 reference statements)

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“…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). Formular dietas de custo mínimo para frangos de corte e que atendam às exigências em treonina é essencial para expressão do máximo potencial genético das aves e para redução do desequilíbrio entre os aminoácidos.…”

Section: Introductionunclassified

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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“…In a study conducted with 1 to 20-day-old broilers fed different levels of dietary threonine (6.84 to 8.70 g/kg), Atêncio et al (2004) observed a quadratic effect on weight gain and feed intake, whose best performances were obtained with 7.96 g/kg of digestible threonine and threonine:lysine ratio of 68.6.…”

Section: Resultsmentioning

confidence: 99%

Nutritional requirements of digestible threonine for growing meat-type quails

et al. 2013

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-The objective of this study was to estimate the nutrient requirements of digestible threonine for meat-type quails (Coturnix coturnix sp) in the growth phase. A total of 1350 not sexed meat-type quails were distributed in a completely randomized design with six threonine levels (10.80, 11.50, 12.20, 12.90, 13.60 and 14.30 g/kg as fed), five replications and 45 quails per experimental unit, from 1 to 14 days of age. The threonine levels in the diet had a quadratic effect on body weight, feed intake and weight gain. Estimates for highest body weight (79.41 g), feed intake (128.96 g/bird) and weight gain (70.73 g) were observed with diets containing 12.60 g/kg of digestible threonine. According to the LRP model, the threonine intake was estimated at 13.40 g/kg of digestible threonine. Protein deposition rate and energy retained in the carcass showed quadratic effect, with estimated digestible threonine levels of 11.80 and 12.00 g/kg in the diet for maximum protein deposition rate (2.00 g/bird) and retained energy in the carcass (15.88 kcal/g), respectively. There was a linear effect on feed cost per kg of live weight gain as threonine levels were increased. Nutritional requirement of digestible threonine for meat-type quails for maximum growth is 12.60 g/kg, corresponding to a digestible threonine:digestible lysine ratio of 67.02.

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Functional interactions of manno-oligosaccharides with dietary threonine in chicken gastrointestinal tract. II. Mucosal development, mucin dynamics and nutrient utilisation

Chee

Iji

Choct

et al. 2010

British Poultry Science

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1. A 3 × 2 factorial experimental design was used to investigate the interaction between threonine concentration (0.7, 1.0 and 1.3 of National Research Council (NRC), 1994, recommendations) and manno-oligosaccharides (MOS) supplemented at 0 and 2 g/kg on growth performance in relation to intestinal flow of crude mucins, mucosal development and nutrient utilisation. 2. There was no interaction between MOS and dietary threonine in any performance variable analysed, except for body weight gain during the period to 14 d of age, where body weight gain was significantly lower in birds fed excess threonine in the absence of MOS. Dietary MOS was also observed to significantly increase the body weight gain at deficient and adequate concentrations of threonine. 3. Dietary treatments had no significant effect on either the ileal external muscularis thickness or crypt depth. However, there was a MOS and threonine interaction in the ileal villus to crypt ratio and ileal crude mucin output with both being increased only at the adequate threonine concentration. 4. Dietary MOS tended to interact with threonine to increase the ileal uptake of D-glucose and L-threonine, but the effect was only apparent in birds fed on the deficient or excess threonine diet. There was no significant interaction between MOS and threonine on ileal digestibility of amino acids. Supplementation of MOS or increased dietary threonine significantly increased the apparent and standardised ileal digestibility of threonine. 5. Results from the current study indicate the possible link between the modulating effects of these supplements on intestinal mucosal development and mucin dynamics. This, in turn, may suggest a relatively higher proportion of mature enterocytes and absorptive area, which would be expected to improve the capacity for digestion and mucosal nutrient absorption.

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Exigências de treonina para frangos de corte machos nas fases de 1 a 20, 24 a 38 e 44 a 56 dias de idade

Cited by 9 publications

References 11 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

Nutritional requirements of digestible threonine for growing meat-type quails

Functional interactions of manno-oligosaccharides with dietary threonine in chicken gastrointestinal tract. II. Mucosal development, mucin dynamics and nutrient utilisation

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