Níveis de metionina + cistina digestíveis em rações para poedeiras no pico de produção

Geraldo, Adriano; Bertechini, Antônio Gilberto; Fassani, Édison José; Rodrigues, Paulo Borges

doi:10.1590/s0102-09352010000500026

Cited by 3 publications

(2 citation statements)

References 11 publications

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“…These results are similar to the findings of Geraldo et al (2010), Jardim Filho et al (2004) and Prochaska and Corey (1993), who reported no lysine level effects on egg solids yields. However, in contrast to the present result, Geraldo (2006) found effects of digestible threonine levels on albumen solids.…”

Section: Resultssupporting

confidence: 91%

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Performance and egg quality of laying hens fed with dietary levels of digestible lysine and threonine

Figueiredo¹,

Bertechini

Fassani

et al. 2012

Arq. Bras. Med. Vet. Zootec.

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The present study was developed using 864 Hy-Line W36 laying hens (42 to 58 weeks of age) with a randomized experimental design in a 4x3 factorial arrangement, with five replicates and 12 birds per experimental unit and 4 evaluation periods of 28 days each. The digestible lysine levels studied were 0.675%, 0.743%, 0.811% and 0.879%, and the digestible threonine levels were 0.542%, 0.596% and 0.650%. The performance and egg quality was evaluated. There were no significant effects on the egg production, specific gravity, albumen and yolk percentage and total solids in albumen and yolk for birds submitted to the different dietary digestible lysine and threonine levels. There was significant interaction between these amino acids on the egg shell percentage and Haugh unit in fresh eggs. There was a decreasing linear effect on the feed intake with increase of digestible lysine level. Egg weight, egg mass and feed conversion demonstrated a quadratic effect with the increase of the digestible lysine level with the best results in the diets with 0.754, 0.772 and 0.795% of digestible lysine, respectively. 0,754; 0,772 e 0,795%, poedeiras, proteína bruta, unidade Haugh

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Section: Resultssupporting

confidence: 91%

“…This behavior was also observed by Geraldo et al (2010), on evaluating hens subjected to different threonine levels in diets according to the Nutritional...…”

Section: Resultsmentioning

confidence: 54%

Performance and egg quality of laying hens fed with dietary levels of digestible lysine and threonine

Figueiredo¹,

Bertechini

Fassani

et al. 2012

Arq. Bras. Med. Vet. Zootec.

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Energia metabolizável e aminoácidos sulfurosos para poedeiras leves no primeiro ciclo de produção

Pinheiro

Costa

Guerra

et al. 2020

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Objetivou-se determinar o nível de energia metabolizável (EM) e de metionina + cistina digestível (M+C) para poedeiras leves de 24 a 44 semanas. O delineamento experimental foi o inteiramente casualizado distribuído em esquema fatorial 3 níveis de M+C digestível (0.603%; 0.670%; e 0.737%) x 3 níveis de EM (2755; 2900 e 3045 kcal/kg), totalizando 9 tratamentos, avaliados por cinco períodos de 28 dias cada. Foi observado interação (P<0,05) dos fatores estudados para as variáveis de consumo de ração, produção de ovos, e para as conversões por massa e por dúzia de ovos. Para qualidade dos ovos houve interação para porcentagem de casca e gema, e em todas as variáveis sorológicas. Nas variáveis histomorfométricas de intestino delgado e útero, só não houve interação para largura de vilosidades intestinais e de dobra uterínica. Recomenda-se a utilização de 0.603% de M+C digestível associado ao nível de 2.900 kcal/kg de EM na dieta de poedeiras leves de24 a 44 semanas.

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Digestible methionine+cysteine in the diet of commercial layers and its influence on the performance, quality, and amino acid profile of eggs and economic evaluation

et al. 2018

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This work aimed at evaluating the effects of 4 digestible Met+Cys levels on the diet of commercial layers and their influence on the productive performance, quality, and amino acid profile of eggs and economic viability of the activity. A total of 576 white Lohmann LSL-Lite layers was distributed into 6 replicates of 24 birds for each diet. The experimental design was completely randomized, with 4 treatments defined by levels evaluated in the feed (0.465, 0.540, 0.581, and 0.647%). The productive performance was measured for 30 weeks. The quality (34 and 50 wk old) and the amino acid profile of eggs (43 wk old) also were evaluated. A linear positive response was observed at higher Met+Cys levels for feed intake, number of eggs per housed bird, and digestible Met+Cys intake. Egg production, egg weight, egg mass, feed efficiency, and weight gain had their optimal values determined by the quadratic regression model at 0.638, 0.654, 0.647, 0.644, and 0.613% digestible Met+Cys, respectively. In the 34th wk, eggshell thickness decreased linearly at higher Met+Cys levels. In the 50th week, the optimal levels detected for eggshell thickness and percentage were 0.571 and 0.570% digestible Met+Cys, respectively. The percentages of proteins, branched-chain amino acids (leucine, isoleucine, and valine), histidine, and proline in eggs (albumen+yolk) showed a linear negative response in function of higher Met+Cys levels. Higher digestible Met+Cys levels (>0.630%) led to a good performance of layers, while lower Met+Cys levels improved the eggshell quality of layers in peak production. Optimal Met+Cys levels may change according to the price of the synthetic amino acid.

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Níveis de metionina + cistina digestíveis em rações para poedeiras no pico de produção

Cited by 3 publications

References 11 publications

Performance and egg quality of laying hens fed with dietary levels of digestible lysine and threonine

Performance and egg quality of laying hens fed with dietary levels of digestible lysine and threonine

Energia metabolizável e aminoácidos sulfurosos para poedeiras leves no primeiro ciclo de produção

Digestible methionine+cysteine in the diet of commercial layers and its influence on the performance, quality, and amino acid profile of eggs and economic evaluation

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