Early Reproductive Characteristics of Leghorn Pullets Reared on Least-Cost Diets Formulated to Protein and/or Amino Acid Specifications

Leeson, S.; Summers, J. D.

doi:10.4141/cjas85-021

Cited by 3 publications

(1 citation statement)

References 6 publications

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“…Aumentar os níveis de aminoácidos sulfurados e de lisina nas fases iniciais e de recria é uma forma eficiente de antecipar a idade à maturidade sexual e elevar a produção de ovos (Leeson & Summers, 1985;Leeson & Caston, 1991). Nível bem próximo ao obtido neste ensaio foi observado por Kwakkel et al (1991), que verificaram que a oferta de dietas com 0,31% de lisina digestível para frangas com 7 a 18 semanas de idade promoveu redução da produção de ovos de 19 a 32 semanas de idade.…”

Section: Methodsunclassified

Níveis de lisina digestível para poedeiras Lohmann LSL na fase de 16 a 25 semanas de idade

et al. 2011

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RESUMO -Neste experimento foram avaliados os efeitos de níveis de lisina digestível no desempenho, no balanço de nitrogênio e na digestibilidade de extrato etéreo em poedeiras Lohmann LSL entre 16 e 25 semanas de idade. Foram avaliados quatro níveis de lisina digestível (0,6; 0,7; 0,8 e 0,9% da ração) utilizando-se 160 poedeiras durante o período de 16 até 25 semanas de idade. As dietas foram isonutritivas, com 17% de PB e 2.800 (pré-postura) e 2.750 kcal (pré-pico) EM/kg. O delineamento inteiramente casualizado foi adotado com quatro níveis de lisina digestível avaliados em quatro repetições. Os níveis de lisina digestível não influenciaram o ganho de peso, os consumos de ração e de proteína e energia, a idade ao primeiro ovo, a produção e o peso dos ovos, os índices de conversão alimentar, a massa do ovo e os balanços de nitrogênio e extrato etéreo. Houve aumento linear positivo do consumo de lisina de acordo com os níveis dietéticos de lisina digestível. Os níveis de lisina utilizados não interferem no desempenho nem no balanço de nutrientes. Sugere-se o uso de 0,6% de lisina por quilograma de ração. Palavras-chave: aminoácido essencial, consumo, frangas, produção de ovos Digestible lysine levels for Lohmann LSL hens 16 to 25 weeks of ageABSTRACT -In this experiment, the effects of digestible lysine levels on performance, nitrogen balance and fat digestibility in Lohmann LSL hens 16 to 25 weeks of age were evaluated. Four levels of digestible lysine (0.6, 0.7, 0.8 and 0.9% in ration) were assessed by utilizing 160 16-year-old laying hens 16 to 25 weeks of age. The diets were isonutritive with 17% CP and 2800 (pre laying) and 2750 (pre peak) kcal/kg. A completely randomized design was used with four lysine levels assessed in four replicates. The lysine levels did not influence weight gain, feed intake, protein and energy intake, age at first egg laying, egg production, egg weight, feed conversion indexes, egg mass, nitrogen balance or crude fat. There was positive linear increase on lysine intake according to the dietary levels of digestible lysine. Lysine levels do not influence the performance or the nutrients balance, and 0.6% of lysine per kilogram of feed is recommended.

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Section: Methodsunclassified

Níveis de lisina digestível para poedeiras Lohmann LSL na fase de 16 a 25 semanas de idade

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Response of Immature Leghorn Pullets to Low-Protein Amino Acid Fortified Diets at 18 or 30°C

Leeson

Caston

1996

Journal of Applied Poultry Research

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Response of Leghorn Pullets to Protein and Energy in the Diet when Reared in Regular or Hot-Cyclic Environments

Leeson

Summers

1989

Poultry Science

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Four experiments were conducted to determine the growing pullet's response to graded levels of dietary ME (2.650 to 3,150 kcal ME/kg) or CP (15 to 20% CP) when reared in conventional (constant 22 C) or hot-cyclic temperatures (22 to 32 C). Each diet was tested with six replicate groups of eight caged birds from 1 day to 140 days of age. Body weight and feed intake were monitored periodically.Increasing the energy concentration of the diet resulted in increased body weight, with this effect being most pronounced in the hot environment. At 140 days of age, birds fed diets providing 2,650 or 2,750 kcal ME/kg were smaller than birds fed diets providing 2,950 or more kcal ME/kg. Increasing the dietary energy concentration resulted in reduced feed intake and a general tendency to increase energy intake. In other experiments, increasing the dietary protein level had an initial effect of increasing body weights, although by 140 days of age, differential dietary protein levels of 15 to 20% had no effect on body weight. Increasing the protein level of the diet resulted in increased protein intake but had no effect on energy intake.It is concluded that given adequate protein intake, pullet growth is most responsive to energy intake. Pullet growth to 140 days of age will be maximized with cumulative nutrient intakes of 21 Meal ME and 1,200 g CP. It appears that such intakes can be achieved with mean dietary specifications during rearing of 2,900 kcal ME/kg and 18% CP. However, with multidiet programs, as commonly used in the industry, it appears that pullet growth is initially most sensitive to dietary protein level, whereas energy intake becomes more critical as the bird approaches maturity. (Key words: pullet, energy, protein) 1989 Poultry Science 68:546-557 546 at Michigan State University on March 31, 2015 http://ps.oxfordjournals.org/ Downloaded from * IillIS NO r-^r NO en O <-> --© ,-. CM CM CM CM CM CM CM M? m © © CM r-© © O o ON r-CM CM CM CM «--• iWW;

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Early Reproductive Characteristics of Leghorn Pullets Reared on Least-Cost Diets Formulated to Protein and/or Amino Acid Specifications

Cited by 3 publications

References 6 publications

Níveis de lisina digestível para poedeiras Lohmann LSL na fase de 16 a 25 semanas de idade

Níveis de lisina digestível para poedeiras Lohmann LSL na fase de 16 a 25 semanas de idade

Response of Immature Leghorn Pullets to Low-Protein Amino Acid Fortified Diets at 18 or 30°C

Response of Leghorn Pullets to Protein and Energy in the Diet when Reared in Regular or Hot-Cyclic Environments

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