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Evaluation of different digestible lysine levels for male broilers during the period of 18 to 40 days of age

Brazilian Journal of Poultry Science. 2014;16(1):83-87 DOI 10.1590/S1516-635X2014000100012


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Journal Title: Brazilian Journal of Poultry Science

ISSN: 1516-635X (Print); 1806-9061 (Online)

Publisher: Fundação APINCO de Ciência e Tecnologia Avícolas

LCC Subject Category: Agriculture: Animal culture: Veterinary medicine | Science: Zoology

Country of publisher: Brazil

Language of fulltext: English

Full-text formats available: PDF, HTML, XML



TCF Carlos (Universidade de São Paulo)

CT Marino (Universidade de São Paulo)

NVP da Silva (Universidade de São Paulo)

LCGS Barbosa (Universidade de São Paulo)

RN Reis (IBR Foods)

K Muramatsu (IBR Foods)

CS da S Araújo (Universidade de São Paulo)

LF Araújo (Universidade de São Paulo)


Blind peer review

Editorial Board

Instructions for authors

Time From Submission to Publication: 32 weeks


Abstract | Full Text

A total of 1.500 male Cobb 500 broilers were used to determine the optimal digestible lysine level for 18 to 40-day-old broilers. The experimental period started when broilers were 18 days old and had an initial average weight of 737 ± 20 g. A completely randomized experimental design was applied, with five lysine levels, totaling five treatments with 10 replicates of 30 birds each. The experimental diets contained equal energy and protein levels, and 0.86, 0.95, 1.04, 1.13, and 1.22% digestible lysine. The following parameters were evaluated: average body weight at 40 days of age, daily weight gain, daily feed intake, feed conversion ratio, carcass yield and parts yield, and abdominal fat percentage. There was a quadratic effect (p<0.05) of digestible lysine levels on average body weight at 40 days of age, daily weight gain, and breast yield, and a cubic effect on feed conversion ratio and abdominal fat. There was no influence of lysine levels of daily feed intake, carcass yield, leg, or wing yields. It was concluded that digestible lysine requirements for male broilers during the evaluated period was 1.22% for performance and 1.04% for carcass yield.