Rearing Early Maturing Pullets

Summers, J. D.; Leeson, S.; Spratt, D.

doi:10.3382/ps.0661750

Cited by 24 publications

(16 citation statements)

References 23 publications

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“…Além disso, diversos autores já afirmaram previamente que a composição do corpo é o fator mais importante que o peso corporal como indicador do preparo do organismo da poedeira para a produção de ovos (13) .…”

Section: Resultsunclassified

Exigência De Metionina + Cistina Para Frangas De Reposição Na Fase Inicial (1 a 6 Semanas De Idade)

et al. 2017

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ResumoObjetivou-se determinar a exigência de metionina + cistina total para frangas na fase inicial e verificar seu efeito sobre a fase de postura. Na primeira fase experimental, 720 aves (50% Lohmann LSL e 50% Lohmann Brown) com uma semana de idade foram distribuídas em delineamento experimental inteiramente casualizado, em esquema fatorial 5 x 2 (níveis de met + cis e linhagens), com quatro repetições e 18 aves por repetição. Os níveis de met + cis total estudados foram 0,536; 0,616; 0,696; 0,776; e 0,856 %. Ao atingirem 22 semanas de idade, iniciou-se a segunda fase experimental, sendo utilizadas 240 aves (50% Lohmann LSL e 50% Lohmann Brown) provenientes da primeira fase experimental. A ração fornecida às aves nesta fase foi igual para todos os tratamentos. Na fase de produção avaliaram-se os efeitos residuais das dietas fornecidas no período inicial sobre os parâmetros produtivos. As exigências de metionina + cistina recomendadas para aves leves e semipesadas, no período de 1 a 6 semanas de idade, são de 0,778% de met + cis total (correspondendo a 0,700% de met + cis digestível) e 0,739% de met + cis total (correspondendo a 0,665% de met + cis digestível), respectivamente.Palavras-chave: aminoácidos; maturidade sexual; ovos; poedeiras; requerimentos. AbstractAn experiment was carried out to evaluate the requirement of methionine +cystine for growing pullets at starter phase (1 to 6 weeks old) and its effect on the laying phase. In the first experiment, 720 birds (50% Lohmann LSL and 50% Lohmann Brown) at one week of age were distributed on a completely randomized design, 5 x 2 factorial arrangement (levels of met + cys and strain), with four replications

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Section: Resultsunclassified

Exigência De Metionina + Cistina Para Frangas De Reposição Na Fase Inicial (1 a 6 Semanas De Idade)

et al. 2017

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“…In this respect, Summers et al (1987) and Renema et al (1999b) reported a positive relation between BW of the hens and the maturation of the reproductive traits and the onset of egg production. In the current research, hens that received crumbles during the rearing phase were heavier at 17 wk of age and started egg production sooner (data not shown) and laid more eggs (0.913 vs. 0.898) that were heavier (56.2 vs. 55.4 g) from 17 to 22 wk of age than hens that were fed mash, although the differences did not reach significance.…”

Section: Rearing Phase Dietsmentioning

confidence: 99%

Influence of feed form and energy concentration of the rearing phase diets on productivity, digestive tract development and body measurements of brown-egg laying hens fed diets varying in energy concentration from 17 to 46 wk of age

Saldaña

Gewehr

Guzmán

et al. 2016

Animal Feed Science and Technology

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a b s t r a c tThe influence of feed form and energy content of the rearing phase diets on hen productivity, gastrointestinal tract (GIT) traits and body measurements was studied in brown-egg laying hens fed diets differing in energy concentration from 17 to 46 wk of age. The experiment was completely randomized with 12 treatments arranged as a (2 × 3) × 2 factorial with two feed forms (mash vs. crumbles) and three AME n concentrations of the rearing phase diets (low, medium and high) and two AME n concentrations (11.10 vs. 11.52 MJ/kg) of the laying phase diets. The AME n of the rearing phase diets differed in 0.42 MJ/kg in all three periods (1-5 wk, 5-10 wk and 10-17 wk of age). Hen productivity was determined from 17 to 46 wk and GIT and body traits were measured at 46 wk of age. The characteristics of the rearing phase diets did not affect any of the production, GIT traits or body measurements studied during the laying phase, except body weight gain (BWG) from 17 to 46 wk of age that was higher (P < 0.01) in hens that were fed mash during the rearing phase than in hens that were fed crumbles. An increase in the energy content of the laying phase diet from 11.10 to 11.52 MJ AME n /kg reduced feed intake (P < 0.001) and improved feed conversion ratio (P < 0.001) from 17 to 46 wk and reduced gizzard contents (P < 0.01) at 46 wk of age but did not affect any of the other production trait studied. The characteristics of the rearing and laying hen diets did not affect any of the GIT traits or body measurements at 46 wk of age. Body weight of the hens was positively (P < 0.001) related with body length, body mass index, tarsus length and tarsus diameter at this age. The data indicate that neither feed form nor energy concentration of the rearing phase diets affected subsequent hen performance. An increase in the AME n content of the layer diet from 11.10 to 11.52 MJ/kg decreased feed intake and improved feed conversion ratio but did not affect hen production or egg quality.

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“…Diversos autores têm afirmado previamente que a composição do corpo é fator mais importante que o peso corporal como indicador do preparo do organismo da poedeira para a produção de ovos (WELLS, 1980, JONHSON et al, 1985, SUMMERS et al, 1987.…”

Section: Fase De Posturaunclassified

Exigência de lisina para aves de reposição de 0 a 6 semanas de idade

Silva

Albino²,

Rostagno³

et al. 2000

R. Bras. Zootec.

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RESUMO -Objetivando estimar as exigências de lisina de 0 a 6 semanas e avaliar seus efeitos na fase de produção de ovos, 300 poedeiras leves (PL) Lohmann Selected Leghorn e 300 poedeiras semipesadas (PSP) Isa Brown foram distribuídas em delineamento em blocos ao acaso e alimentadas com ração basal contendo 18,50% de proteína bruta (PB) e 2.900 kcal de energia metabolizável (EM) suplementada com L-lisina HCl para os níveis de 0,75; 0,80; 0,85; 0,90; e 0,95% de lisina total nas rações. Na fase de postura, 160 aves de cada linhagem foram alimentadas com ração de produção contendo 16,50% de PB, 2.900 kcal EM, 2,9% de Ca +2 e 0,755% de lisina. As estimativas das exigências de lisina obtidas pela conversão alimentar para a fase de 0 a 6 semanas de idade foram de 0,86% ou consumo de 254 mg diário para as PL e de 0,87% ou consumo de 238 mg diário para as PSP. Produção de ovos, consumo de ração e conversão por dúzia de ovos das PSP foram afetados de forma quadrática pelos níveis de lisina da fase de crescimento. Massa de ovos e conversão por massa de ovos das PSP e conversão por massa de ovos das PL foram afetadas de forma linear. Durante a fase de crescimento, as PL apresentaram pior conversão alimentar que as PSP. Durante a fase de produção, as PSP produziram ovos mais leves, mas as conversões por massa e por dúzia de ovos foram superiores às das PL.Palavras-chaves: aminoácido, crescimento, produção e massa de ovos Requirement of Lysine for Rearing Egg-Type Pullets from 0 to 6 Weeks of Age 1ABSTRACT -The objective of this work were to estimate the requirement of lysine from 0 to 6 weeks and to evaluate the posterior effect on the performance of two egg-type strains. Three hundred egg-white pullets from 0 to 6 week of age and three hundred egg-brown pullets from 0 to 6 week of age were allotted to a randomized block design with five treatments and four replicates. A basal diet with 18.50% of crude protein (CP) and 2900 kcal metabolizable energy (ME) was supplemented with L-lysine HCl to obtain 0.75, 0.80, 0.85, 0.90, and 0.95% of total lysine in the diet. During the laying period all hens received the same diet with 16.5 CP, 2822 kcal ME, 3.81% Ca +2 and 0.755% of lysine. The pullets requirement estimates of lysine based on feed: gain was 0.86% or a daily intake of 254 mg for white-egg and 0.87% or a daily intake of 238 mg for brown-egg. Egg production, feed intake and egg dozen and egg mass ratio were quadraticly affected. Egg mass and egg mass ratio of brown-egg, and egg mass ratio of white-egg were linearly affected. During the growing phase the white-egg pullets showed worse feed:gain ratio than brown-egg pullets. During the egg production phase the brown-egg pullets showed lighter eggs, but the egg mass and egg dozen ratio were higher than white-egg pullets.

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Rearing Early Maturing Pullets

Cited by 24 publications

References 23 publications

Exigência De Metionina + Cistina Para Frangas De Reposição Na Fase Inicial (1 a 6 Semanas De Idade)

Exigência De Metionina + Cistina Para Frangas De Reposição Na Fase Inicial (1 a 6 Semanas De Idade)

Influence of feed form and energy concentration of the rearing phase diets on productivity, digestive tract development and body measurements of brown-egg laying hens fed diets varying in energy concentration from 17 to 46 wk of age

Exigência de lisina para aves de reposição de 0 a 6 semanas de idade

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