Ideal Ratios of Isoleucine, Methionine, Methionine Plus Cystine, Threonine, Tryptophan, and Valine Relative to Lysine for White Leghorn-Type Laying Hens of Twenty-Eight to Thirty-Four Weeks of Age

Bregendahl, Kristjan; Roberts, Stacey; Kerr, B. J.; Hoehler, D.

doi:10.3382/ps.2007-00412

Cited by 76 publications

(77 citation statements)

References 30 publications

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“…The ratio between digestible tryptophan and digestible lysine estimated in this study was also higher than the 0.223 estimated by Bregendahl et al (2008) for optimal production of egg mass of hens from 28 to 34 weeks of age. However, these authors used increasing levels of digestible lysine in the experimental diets, which can also make the estimation of the digestible tryptophan:digestible lysine ratio subjective.…”

Section: Resultscontrasting

confidence: 74%

“…However, the ratios between them are much less influenced (Bregendahl et al, 2008), so it is more important to determine the ideal ratios between amino acids rather than the absolute requirement of the birds for each amino acid. Furthermore, the ideal profile of amino acids for commercial laying hens is not well established in the literature.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultscontrasting

confidence: 74%

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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“…Basal diet was formulated based on corn and soybean meal to contain 149.58 g CP/kg diet and 2,900 kcal AMEn/kg diet). Ideal digestible ratios of Met + Cys, Thr, Trp, Val, Arg, Ile and Phe + Tyr relative to SID Lys were 103,81,28,96,103,80, and 121%, which corresponded to 3.0 perceptual point above the ratios recommended by Brumano et al (2010), Rocha et al (2013a), Calderano et al (2012), Rostagno et al (2011), Bregendahl et al (2008, Rocha et al (2013b) and Rostagno et al (2011), respectively. Throughout the study, hens were provided mash feed and water ad libitum.…”

Section: Husbandry Diets and Experimental Designmentioning

confidence: 71%

Standardized ileal digestible lysine requirement of white commercial layers in peak egg production

Pastore¹,

Gomes²,

Viana³

et al. 2018

Biosci. J.

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This study was conducted to determine the standardized ileal digestible lysine (SID Lys) requirements for white commercial layers in peak egg production phase. A total of two hundred eighty-eight 24 week-old Hy-Line W-36 layers were randomly assigned to one of six treatments groups, with eight replicates of six hens each. A basal diet, SID Lys-deficient, was graded supplemented with L-Lysine HCl (78.4%) in order to produce experimental treatments (6.0, 6.6, 7.2, 7.8, 8.4 and 9.0 g SID Lys/kg diet). Throughout the 16-week-feeding trial (24 to 40 weeks of age) hens had free access to water and mash feed. Data were analyzed as one-way ANOVA and optimum SID Lys level for each dependent variable assessed were estimated using polynomial and linear broken-line regression model. Feed intake and SID Lys intake were both linearly enhanced by graded SID Lys levels. According to linear broken-line regression model, the breakpoint for egg production, egg weight, and egg mass occurred at 8.14, 8.56 and 8.35 g SID Lys/kg diet, respectively. The breakpoint for feed conversion per egg mass (kg/kg) and per dozen of eggs (kg/dozen) occurred at 8.48 and 7.80 g SID Lys/kg diet, respectively. Eggshell weight and albumen weight were unaffected by dietary SID Lys supply. Weight gain and yolk weight reached optimum values at 8.33 and 8.03 g SID Lys/kg diet, respectively, according to linear broken-line regression model. In conclusion, SID Lys requirement for white commercial layers in peak egg production phase is 8.48 g/kg diet, which corresponds to an average daily SID Lys intake of 813 mg/hen.

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“…Bregendahl et al (2008) constataram relação de 99% entre os aminoácidos sulfurosos com a lisina para máxima produção de ovos em poedeiras leves de 28 a 34 semanas de idade. Cupertino et al (2009) De acordo com os dados de peso e massa de ovos nos níveis de 0,80 e de 0,85% de metionina+cistina digestível, apesar de o consumo desses aminoácidos ter aumentado de 710 para 742 mg/ave/dia, os valores absolutos destes parâmetros reduziram.…”

Section: Resultsunclassified

Níveis de metionina+cistina digestível em rações para poedeiras leves no período de 24 a 40 semanas de idade

et al. 2010

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RESUMO -Objetivou-se determinar os níveis de aminoácidos sulfurosos digestíveis para se estabelecer a relação ideal metionina+cistina:lisina em rações para poedeiras leves no período de 24 a 40 semanas de idade. Utilizaram-se 216 aves Hy-Line W36 em delineamento de blocos casualizados com seis níveis, cada um com seis repetições de seis aves por unidade experimental. Os níveis de aminoácidos sulfurosos digestíveis foram obtidos a partir de uma dieta basal com baixo nível de metionina+cistina digestível (0,65%) e suplementada com 0,00; 0,05; 0,10; 0,15; 0,20 e 0,25% de DL-metionina 99,2%, de forma a apresentar relações metionina + cistina:lisina de 84, 91, 97, 104, 110 e 117%. O período experimental teve duração de 16 semanas e foi subdividido em quatro subperíodos de coleta dos ovos, cada um com 28 dias de duração. Os níveis de metionina+cistina digestível influenciaram a produção de ovos e a eficiência de utilização de lisina por produção total de ovos, atingindo um platô em 0,811 e em 0,772% de metionina+cistina digestível, respectivamente. O nível de metionina+cistina digestível considerado exigência para poedeiras leves no período de 24 a 40 semanas de idade é de 0,772%, que corresponde a consumo de 682 mg/ave/dia de metionina+cistina digestível e a relação metionina+cistina:lisina de 100%. Palavras-chave: aminoácidos sulfurados, exigências nutricionais, proteína idealDigestible methionine + cystine level in meals for light-weight laying hens from 24 to 40 weeks of age ABSTRACT -The objective of this work was to determine digestible sulfurous amino acids levels to establish the ideal methionine+cystine:lysine relationships in meals of light-weight laying hens in the period from 24 to 40 weeks of age. It was used 216 Hy-Line W36 birds distributed in a randomized block design with 6 levels each one with 6 repetitions and 6 birds per experimental unit. The digestible sulfurous amino acids levels were obtained from a basal diet with low levels of digestible metionin+cistine (0.65%) supplemented with 0.00; 0.05; 0.10; 0.15; 0.20 and 0.25% of DL-methionine (99.2%) to provide a relationship methionine+cystine:lysine of 84, 91, 97, 104, 110 and 117%. The experimental period lasted 16 weeks and it was subdivided in 4 subperiods of collection of the eggs, each one corresponding to 28 days. Levels of digestible methionine+cistine affected egg production and lysine utilization efficiency per total egg production, reaching a plateau in 0.811 and 0.772% of digestible methionine+cistine, respectively. The digestible methionine+cystine level considered as a requirement for light-weight laying hens in the period from 24 to 40 weeks of age is of 0.772%, corresponding to digestible methionine+cystine consumption of 682 mg/hen/day, and the relationship methionine+cystine:lysine of 100%.Key Words: ideal protein, nutritional requirements, sulfur amino acid IntroduçãoAtualmente tem sido importante otimizar a utilização dos alimentos na dieta das aves, principalmente os componentes proteicos, por possuírem os mais elevados custos, ...

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Ideal Ratios of Isoleucine, Methionine, Methionine Plus Cystine, Threonine, Tryptophan, and Valine Relative to Lysine for White Leghorn-Type Laying Hens of Twenty-Eight to Thirty-Four Weeks of Age

Cited by 76 publications

References 30 publications

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

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

Standardized ileal digestible lysine requirement of white commercial layers in peak egg production

Níveis de metionina+cistina digestível em rações para poedeiras leves no período de 24 a 40 semanas de idade

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