Exigências nutricionais de lisina e arginina para frangos de corte
Data
2021-10-20
Autores
Nogueira, Bernardo Rocha Franco
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
O fornecimento adequado de aminoácidos para frangos de corte, permitem a redução da proteína bruta das dietas, dessa forma diversas ferramentas matemáticas são utilizadas para predizer a eficiência de utilização dos aminoácidos pelas aves, possibilitando um melhor suprimento desses nutrientes. Com objetivo de determinar as exigências e a eficiência de utilização de lisina (Lis) e arginina (Arg) para frangos de corte, foram realizados 12 ensaios (seis para Lis e seis para Arg) com frangos de corte, macho ou fêmeas, alimentadas com níveis crescentes dos aminoácidos em 3 fases: inicial (1 a 14 dias), crescimento (15 a 28 dias) e final (29 a 42 dias). As variáveis analisadas foram o desempenho e composição corporal. Os dados de desempenho foram utilizados para ajustar os modelos de regressão: polinomial quadrático, linear platô e curvilíneo platô a fim de estimar as exigências de Lis e Arg para frangos de corte em diferentes fases de criação. Com a composição corporal foi determinada a eficiência de utilização de Lis e Arg calculadas através de uma regressão linear entre o aminoácido depositado no corpo pela ingestão do aminoácido para ganho descontado da mantença. A exigência para máximo ganho de peso para frangos de corte macho foi 0,415; 1,38; 1,79 g dig Lis/ave/dia e 0,457; 1,48; 2,11 g dig Arg/ave/dia nas fases inicial, crescimento e final respectivamente, enquanto as fêmeas necessitam de 0,415; 1,21; 1,40 g dig Lis/ave/dia e 0,446, 1,34 e 1,89 g dig Arg/ave/dia. A eficiência de utilização de Lis e Arg não é afetada pelo sexo e pela idade das aves, sendo 0,79 para Lis e 0,62 para Arg.
The adequate supply of amino acids for broilers chicken allows the reduction of dietary crude protein, this way several mathematical tools are used in order to predict the efficiency of amino acids utilization for birds, enabling a better supply of these nutrients. To determine the requirements and efficiency of utilization of lysine (Lys) and arginine (Arg) for broiler chickens, twelve doseresponse assays were carried out to describe male and female broiler chicken responses to Lys or Arg intake in the starter (1-14 days of age), grower (15-28 days of age), and finisher (29-42 days of age) phase. Analyzed variables were: performanced and body composition. The data of performance were used to adjust the regression models: quadratic polynomial, linear response plateau, and curvilinear response plateau in order to estimate the requirements of Lys and Arg for broilers in different growth phases. With the body composition were determined the efficiency of Lys and Arg utilization, calculated through a linear regression between amino acid deposited on the body by amino acid intake for gain (less maintenance). Based on maximum weight gain, male broiler chikens require 0.415, 1.38, 1.79 g dig Lys/Bird/day and and 2.11 g dig Arg/bird/day in the starter, grower, and finisher phases, respectively. Based on the same criteria, female requirements are 0.415, 1.21, and 1.40 g dig Lys/bird/day and 0.446, 1.34, and 1.89 g dig Arg/bird/day in the starter, grower, and finisher phases, respectively. The efficiency of Lys and Arg utilization was not affected by either age or sex. Lys and Arg were utilized for growth at 0.79 and 0.62 times, respectively for each unit of dig amino acid consumed.
The adequate supply of amino acids for broilers chicken allows the reduction of dietary crude protein, this way several mathematical tools are used in order to predict the efficiency of amino acids utilization for birds, enabling a better supply of these nutrients. To determine the requirements and efficiency of utilization of lysine (Lys) and arginine (Arg) for broiler chickens, twelve doseresponse assays were carried out to describe male and female broiler chicken responses to Lys or Arg intake in the starter (1-14 days of age), grower (15-28 days of age), and finisher (29-42 days of age) phase. Analyzed variables were: performanced and body composition. The data of performance were used to adjust the regression models: quadratic polynomial, linear response plateau, and curvilinear response plateau in order to estimate the requirements of Lys and Arg for broilers in different growth phases. With the body composition were determined the efficiency of Lys and Arg utilization, calculated through a linear regression between amino acid deposited on the body by amino acid intake for gain (less maintenance). Based on maximum weight gain, male broiler chikens require 0.415, 1.38, 1.79 g dig Lys/Bird/day and and 2.11 g dig Arg/bird/day in the starter, grower, and finisher phases, respectively. Based on the same criteria, female requirements are 0.415, 1.21, and 1.40 g dig Lys/bird/day and 0.446, 1.34, and 1.89 g dig Arg/bird/day in the starter, grower, and finisher phases, respectively. The efficiency of Lys and Arg utilization was not affected by either age or sex. Lys and Arg were utilized for growth at 0.79 and 0.62 times, respectively for each unit of dig amino acid consumed.
Descrição
Palavras-chave
Aminoácidos, Nutricionais, Predição, Arginina