Effect of forced-molting methods and rearing temperatures on the performance and organ biometrics of laying hens

Sgavioli, Sarah; Filardi, Rosemeire da Silva; Praes, M. F. F. M.; Domingues, Carla Heloísa de Faria; Andrade, Pedro de; Pileggi, J; Boleli, Isabel Cristina; Junqueira, Otto Mack

doi:10.1590/s1516-635x2013000300011

Cited by 5 publications

(5 citation statements)

References 9 publications

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“…For all the treatments, FCR (in kilograms of feed per dozen eggs) was similar to that reported by Morales et al (2018b) (1.65-1.82 kg feed/dozen eggs) for the SCLH of the Isa Brown line for 17 weeks of production and Sgavioli et al (2013) (1.77 kg feed/dozen eggs) for 71-week-old Isa Brown hens during 112 days of postmolt production. Met+Cys allows an increase in crude protein in albumen and yolk and improves EP, FCR, egg size, and EW (Oliveira Filho, 2019).…”

Section: Production Parameterssupporting

confidence: 81%

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

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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.

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Section: Production Parameterssupporting

confidence: 81%

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

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“…On the first week, birds fed ground alfalfa showed much lower intakes than those on the other treatments. The consumption of ground alfalfa in the first week was 1.87 g/bird/day, similar to that found by Sgavioli et al (2013), who reported intake of 1.63 g/bird/day when working with a diet containing 90% ground alfalfa. That low intake level can be explained by the fact that inclusion of dietary fiber depresses feed intake in hens.…”

Section: Resultssupporting

confidence: 87%

“…Keshavarz and Quimby (2002) reported that chickens subjected to total feed restriction and to a diet of grape residue with addition of 10 ppm thyroxine stopped laying respectively on the third and fourth days. Sgavioli et al (2013) observed that birds given diets containing 90%, 70% and 50% of ground alfalfa or diet with the addition of 2800 ppm zinc or under feed restriction ceased laying in 3.67, 3.67, 4.22, 3.89 and 3.44 days respectively. Koelkebeck and Anderson (2007) mention that during fasting, domestic fowls tend to use all nutrients for body maintenance and do not divert them for production.…”

Section: Resultsmentioning

confidence: 99%

Feed type for induced molting of commercial layer hens

et al. 2014

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-An experiment employing three hundred and twenty 81-week-old Lohmann LSL commercial-breed hens was conducted to compare alternative induced-molting methods with the conventional method (fasting). Induced molting lasted 28 days at most, production and quality being monitored for four periods of 28 days thereafter. A completely randomized experimental design with five treatments, eight replicates of eight birds each per plot was adopted. The following experimental treatments were applied until a loss of 26% of body weight was reached: T1 -fasting, T2 -wheat bran ad libitum, T3 -rice bran ad libitum, T4 -cracked rice ad libitum, T5 -ground alfalfa ad libitum. Birds were then fed production diet ad libitum, except for those on treatment T1 (fasting) which received 30, 60 and 100 g/bird/day and then feed ad libitum. During induced molting the birds were exposed to a natural photoperiod and at day 28 that period was increased by 30 minutes/week until reaching 16 hours of light/day. The characteristics evaluated during induced molting were: feed intake, body weight changes and laying percentage. In the post-molt period, performance (feed intake, laying percentage, egg weight, egg mass, feed conversion ratio per dozen and per egg mass and percentage of broken eggs) and egg quality (specific gravity, eggshell breaking strength, percentages of eggshell, yolk, and albumen, eggshell thickness, yolk color and Haugh unit) were evaluated. Every 28 days one egg was collected from each repetition for three consecutive days for quality assessment. The use of rice bran and wheat bran is viable as molting inducers since the birds given those treatments display performance and egg quality similar to those fasted during the induced molting and also because these ingredients promote easier handling, eliminates the need for grinding and feed-mixing equipment and, being less aggressive, provide greater bird welfare.

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“…La producción de huevos en este estudio estuvo entre 61.98 y 68.64%, sin diferencia significativa entre tratamientos, e inferior al 72.74% registrada en aves de huevo color marrón Isa Brown de 72 semanas de edad sometidas a muda inducida (Sgavioli et al, 2013), al 78.08% en aves Hissex Brown de 100 semanas de edad sometidas a muda in-ducida durante 112 días de producción posmuda (Girardon, 2011) y al 71.4% en aves H&N de 95 semanas de edad sometidas a muda inducida y en 140 días de producción pos-muda (Gongruttananun et al, 2013). Estas diferencias podrían ser atribuidas a las diferencias genéticas, la calidad nutricional y bromatológica del alimento, el estatus sanitario de las granjas, planes vacunales, y calidad de las vellosidades intestinales (Hy-Line, 2016).…”

Section: Discussionunclassified

Parámetros productivos y económicos de gallinas ponedoras ISA Brown en segundo ciclo de producción suplementadas con aminoácidos no esenciales

Morales-Suárez¹,

Rodríguez²,

Verján³

2018

Rev. investig. vet. Perú

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El estudio buscó evaluar parámetros productivos y económicos en gallinas ponedoras de segundo ciclo Isa Brown suplementadas con glutamina + ácido glutámico (Aminogut®). Se evaluaron cuatro niveles del producto comercial (0, 0.8, 1.6 y 2.4%) en dietas para gallinas ponedoras de segundo ciclo durante trece semanas de producción (45-119 días). Se colectaron datos de desempeño productivo y se evaluaron parámetros económicos. La suplementación de la ración con Aminogut® al 1.6% mejoró el número de huevos por ave alojada y la conversión alimenticia (1.65 kg alimento por docena de huevos), aunque sin encontrar diferencias estadísticas para las variables consumo de alimento, tamaño del huevo, producción de huevos (%) y masa de huevo. Por otro lado, la suplementación con Aminogut® durante las primeras dos semanas pos-muda, no obstante, constituye una estrategia para incrementar la producción de las aves y disminuir los costos de encasetamiento de nuevos lotes

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Effect of forced-molting methods and rearing temperatures on the performance and organ biometrics of laying hens

Cited by 5 publications

References 9 publications

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

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

Feed type for induced molting of commercial layer hens

Parámetros productivos y económicos de gallinas ponedoras ISA Brown en segundo ciclo de producción suplementadas con aminoácidos no esenciales

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