Exigência e eficiência de utilização do triptofano para frangos de corte
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Data
2018-02-26
Autores
Acácio, Raian Malta
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Universidade Estadual Paulista (Unesp)
Resumo
Seis ensaios dose-respostas para machos e fêmeas, com níveis crescentes de TRP foram conduzidos para (1) determinar exigência, (2) calcular eficiência de utilização e (3) elaborar um modelo fatorial. O delineamento foi inteiramente casualizado, constituído de sete níveis de TRP com quatro repetições de 20 aves cada, mais um tratamento contraprova. As dietas foram formuladas através da Técnica da Diluição, e os níveis de TRP variaram entre 0,56 a 2,94 g/kg (1 a 14 dias), 0,54 a 2,75 g/kg (15 a 28 dias) e 0,52 a 2,60 g/kg (29 a 42 dias). As variáveis analisadas foram: desempenho e composição corporal (deposição de proteína no corpo e penas). Os dados de desempenho foram ajustados aos modelos Broken-line (BL), Polinomial Quadrático (PQ) e Quadrático Broken-line (QBL), e os de composição foram utilizados para calcular a eficiência e elaborar o modelo fatorial. (1) dentre os modelos ajustados o PQ apresentou o melhor ajuste, e o requerimento estimado para o máximo ganho de peso foi 86, 264 e 441 mg/ave dia para machos e 76, 237, e 278 mg/ave/dia para as fêmeas. (2) a eficiência foi calculada através de uma regressão linear entre o TRP depositado no corpo pela ingestão de TRP para ganho (menos a mantença), e o valor obtido foi de 71% e (3) o modelo fatorial elaborado estimou valores condizente com a literatura, sendo essa uma boa ferramenta a ser empregada pelos profissionais da área na elaboração de dietas e programas alimentares mais precisos, uma vez que o modelo fatorial possibilita estimar o requerimento diário.
Were performed six trials dose-response for male and female broiler chickens, with increase TRP levels (1) to meet requirement, (2) utilization of efficiency and (3) factorial model elaborate. The design was completely randomized, with seven TRP levels and four replicates of 20 birds each, more a counter-proof treatment. The diets were formulated through of dilution technique, and the TRP levels ranged among 0.56 to 2.94 g/kg (1 to 14 days of age), 0.54 to 2.75 g/kg (15 to 28 days of age). Analyzed variables were: performance and body composition (protein deposition in the feather-free body and feather). The data of performance were fitted to Broken-line (BL), Quadratic polynomial (PQ) and Quadratic Broken-line (QBL) models, and the composition were used to calculate efficiency and factorial model elaborate. (1) among the fitted models the PQ presented better fit, and requirement estimated for body weight maximum was 86, 264 and 441 mg/bird/day and for male and 76, 237 and 278 mg/bird/day for female. (2) the efficiency was calculated through of a linear regression between TRP deposited on the body by TRP intake for gain (less maintenance), and calculated efficiency value was 71% and (3) the factorial model estimated requirement values consistent with the literature, being a good tool to be used by professionals in the area in the elaboration of diets and more accurate fed programs, since the factorial model makes it possible to estimate the daily requirement.
Were performed six trials dose-response for male and female broiler chickens, with increase TRP levels (1) to meet requirement, (2) utilization of efficiency and (3) factorial model elaborate. The design was completely randomized, with seven TRP levels and four replicates of 20 birds each, more a counter-proof treatment. The diets were formulated through of dilution technique, and the TRP levels ranged among 0.56 to 2.94 g/kg (1 to 14 days of age), 0.54 to 2.75 g/kg (15 to 28 days of age). Analyzed variables were: performance and body composition (protein deposition in the feather-free body and feather). The data of performance were fitted to Broken-line (BL), Quadratic polynomial (PQ) and Quadratic Broken-line (QBL) models, and the composition were used to calculate efficiency and factorial model elaborate. (1) among the fitted models the PQ presented better fit, and requirement estimated for body weight maximum was 86, 264 and 441 mg/bird/day and for male and 76, 237 and 278 mg/bird/day for female. (2) the efficiency was calculated through of a linear regression between TRP deposited on the body by TRP intake for gain (less maintenance), and calculated efficiency value was 71% and (3) the factorial model estimated requirement values consistent with the literature, being a good tool to be used by professionals in the area in the elaboration of diets and more accurate fed programs, since the factorial model makes it possible to estimate the daily requirement.
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Palavras-chave
Aminoácidos, Avicultura, Composição corporal, Modelos de predição