Exigência nutricional de lisina digestível para poedeiras semipesadas no segundo ciclo de produção

Schmidt, Marlene; Gomes, Paulo Cézar; Rostagno, Horácio Santiago; Albino, Luiz Fernando Teixeira; Nunes, Ricardo Vianna; Cupertino, Edwiney Sebastião

doi:10.1590/s1516-35982009001000014

Cited by 6 publications

(2 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the results of the present study are different from the findings of Schmidt et al (2009), who did not find any influence of the supply of Silva et al (2000) also fed different digestible lysine and sulfur amino acid levels to commercial layers and did not find any differences in performance parameters.…”

Section: Lysine and Methionine + Cystine For Laying Hens During The Pcontrasting

confidence: 99%

Lysine and methionine + cystine for laying hens during the post-molting phase

Domingues¹,

Sgavioli²,

Praes³

et al. 2012

Rev. Bras. Cienc. Avic.

View full text Add to dashboard Cite

One experiment was conducted to evaluate the effect of using different lysine and methionine + cystine levels on body weight recovery, performance, and egg quality of laying hens during the post-molting period. In this trial, 432 Isa Brown layers, with 72 weeks of age, were distributed in 54 cages according to a completely randomized design with six treatments and nine replicates of eight birds each. During the resting period, six diets with different digestible lysine and methionine + cystine levels were used, as follows: 0.48% digestible lysine and 0.43% methionine + cystine; 0.48% digestible lysine and 0.47% methionine + cystine; 0.48% digestible lysine and 0.52% methionine + cystine; 0.56% digestible lysine and 0.50% methionine + cystine; 0.56% digestible lysine and 0.56% methionine + cystine; 0.56% digestible lysine and 0.62% methionine + cystine. Data were submitted to analysis of variance and means were compared at by Tukey’s test at 5% probability level. The different lysine and methionine + cystine levels in the diets fed during the resting period significantly influenced layer performance. The diet containing 0.56% lysine and 0.56% methionine + cystine promoted higher egg weight eggs during the second production cycle

show abstract

Section: Lysine and Methionine + Cystine For Laying Hens During The Pcontrasting

confidence: 99%

Lysine and methionine + cystine for laying hens during the post-molting phase

Domingues¹,

Sgavioli²,

Praes³

et al. 2012

Rev. Bras. Cienc. Avic.

View full text Add to dashboard Cite

show abstract

“…A total of 2300 records (23 treatments × five replicates × 20 weeks) were added during the fieldwork. The EAA ranges in the experimental design were established to include the levels for second-cycle hens in commercial genetic lines available in the literature (Schmidt et al, 2009a(Schmidt et al, , 2009b(Schmidt et al, , 2010Schneider, 2011;Polese et al, 2012;Agustini et al, 2014;Hy-Line, 2014) and levels recommended by Rostagno et al (2011) and Rostagno et al (2017) for laying-hen brown eggs with medium-superior performance in the first production cycle.…”

Section: Experimental Designmentioning

confidence: 99%

Multivariate modeling strategies to predict nutritional requirements of essential amino acids in semiheavy second-cycle hens

Morales-Suárez¹,

Ospina-Rojas²,

Méndez-Arteaga³

et al. 2021

Revista Brasileira De Zootecnia

View full text Add to dashboard Cite

Non-ruminantsFull-length research article Multivariate modeling strategies to predict nutritional requirements of essential amino acids in semiheavy second-cycle hens ABSTRACT -An experiment with 23 diets was performed to evaluate the effect of digestible lysine (Lys), digestible methionine + cysteine (Met+Cys), and digestible threonine (Thr) on egg production of H&N Brown second-cycle laying hens (SCLH) for 20 weeks (92-111 weeks of age) in cages under environmental conditions. Body weight (BW), feed intake (FI), feed conversion ratio (FCR), egg weight (EW), number of hen-housed eggs, and livability were also evaluated during the experiment. Diets were formulated from a central composite design that combined five levels of Lys, Met+Cys, and Thr ranging from 727 to 1159, 662 to 1055, and 552 to 882 mg/kg, respectively. Egg production (EP) data were evaluated through three different modeling strategies: egg production models, multivariate polynomial models, and artificial neural networks (ANN). A cascade-forward neural network with logsigmoid transfer function was selected as the best model according to goodness-offit statistics in both identification and validation data. One of the best scenarios for EP of H&N Brown SCLH under specific outdoor conditions was established at Lys, Met+Cys, and Thr levels of 1138, 1031, and 717 mg/hen• day, respectively. The ANN model may be an appropriate tool to study and predict EP of H&N Brown SCLH based on the combination of three different levels of essential digestible amino acids. The strategies included in this work may contribute to improving poultry performance based on modeling techniques to study other production parameters in terms of different nutritional requirements and productive conditions.

show abstract