Model to estimate lysine requirements of broilers

J.C. Siqueira; N.K. Sakomura; R.M. Gous; I.A.M.A. Teixeira; J.B.K. Fernandes; E.B. Malheiros

Model to estimate lysine requirements of broilers

In: Modelling nutrient digestion and utilisation in farm animals

Authors:

J.C. Siqueira

J.C. Siqueira ¹Universidade Estadual Paulista, UNESP, Via de Acesso Prof. Paulo Donato Castellane s/n, Jaboticabal 14 884-900, São Paulo, Brazil; sakomura@fcav.unesp.br

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N.K. Sakomura

N.K. Sakomura ¹Universidade Estadual Paulista, UNESP, Via de Acesso Prof. Paulo Donato Castellane s/n, Jaboticabal 14 884-900, São Paulo, Brazil; sakomura@fcav.unesp.br

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R.M. Gous

R.M. Gous ²University of KwaZulu-Natal, Private bag X01, Scottsville 3209, South Africa

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I.A.M.A. Teixeira

I.A.M.A. Teixeira ¹Universidade Estadual Paulista, UNESP, Via de Acesso Prof. Paulo Donato Castellane s/n, Jaboticabal 14 884-900, São Paulo, Brazil; sakomura@fcav.unesp.br

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J.B.K. Fernandes

J.B.K. Fernandes ¹Universidade Estadual Paulista, UNESP, Via de Acesso Prof. Paulo Donato Castellane s/n, Jaboticabal 14 884-900, São Paulo, Brazil; sakomura@fcav.unesp.br

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E.B. Malheiros

E.B. Malheiros ¹Universidade Estadual Paulista, UNESP, Via de Acesso Prof. Paulo Donato Castellane s/n, Jaboticabal 14 884-900, São Paulo, Brazil; sakomura@fcav.unesp.br

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Type:: Chapter

Pages:: 306–314

DOI:: https://doi.org/10.3920/9789086867127_035

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The purpose of this study is to describe the development of a model to predict the digestible lysine requirements of broilers using the factorial approach, and to evaluate the model using as reference the model presented in Brazilian Tables for Poultry and Swine. The model partitions the requirement for maintenance and growth for feather-free body protein and feather protein, in which the inputs are body and feather protein weight and the daily rates of protein deposition in the feather-free body and feathers. The parameters that express the lysine requirement for maintenance were obtained in metabolism trials with roosters, and those for the efficiency of lysine utilization in experiments with broilers from 1 to 42 d. Based on these results the model proposed was: Lys (mg/d) = [(151×BP_m^-0.27×BP^t) + (0.01×Pt×18)] + [(75×BPD/0.77) + (18×FPD/0.77)], where Lys = digestible lysine requirement (mg/d), BP_m=body protein weight at maturity (kg), BP_t= body protein weight at time t (kg), FP_t= feather protein weight at time t (kg), BPD=body protein deposition (g/d), FPD = feather protein deposition (g/d). The model yields sensible predictions of the digestible lysine requirements of broilers of different strains and ages growing at their potential, and suggests a lower lysine requirement after 27 d than does the Brazilian model. The proposed model is the first step in the development of a simulation model that predicts the food intake of a broiler and hence the dietary amino acid content that would optimise performance.

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Modelling nutrient digestion and utilisation in farm animals

E-Book ISBN:: 9789086867127

Publisher:: Wageningen Academic

Print Publication Date:: 30 Oct 2010

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- Life Sciences

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Model to estimate lysine requirements of broilers

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Modelling nutrient digestion and utilisation in farm animals

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