Processamento do alimento e sua influência sobre o consumo, digestibilidade e parâmetros bioquímicos de papagaios-verdadeiro (Amazona aestiva)
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Data
2016-12-05
Autores
Di Santo, Ludmilla Geraldo [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
Estudos sobre processamento de rações e sua influência no metabolismo são escassos para psitacídeos. Desta forma, o presente estudo teve como objetivo avaliar o consumo, digestibilidade, parâmetros bioquímicos, hematológicos e radiográficos de papagaios-verdadeiro após a transição de dieta com alta gordura, baseada em girassol, para alimento balanceado para manutenção de papagaios. Esta formulação balanceada foi processada de modo a se obter três diferentes graus de cozimento do amido: Ração peletizada (PEL) - ingredientes moídos com peneira de 2mm e peletizados, com 27% de cozimento do amido; Ração extrusada baixo cozimento (EXTb) - ingredientes moídos com peneira de 2mm e extrusados com baixa transferência de energia, com 82% de cozimento do amido; Ração extrusada elevado cozimento (EXTa) - ingredientes moídos com peneira de 0,5mm e extrusados com elevada transferência de energia, com 98% de cozimento do amido. Trinta papagaios-verdadeiro adultos foram mantidos na dieta à base de girassol por 90 dias, para homogeneização do grupo e determinação dos valores basais. Posteriormente foram distribuídos em delineamento inteiramente casualizado com 10 repetições (papagaios) por tratamento (rações experimentais) e mantidos nas três dietas por um período de 160 dias. Foram determinados o consumo e a palatabilidade dos alimentos, coeficiente de digestibilidade aparente dos nutrientes, concentrações de ácidos graxos voláteis - AGVs (acético, butírico, propiônico, valérico, isovalérico e isobutírico), lactato e amônia das excretas. Ao início e final do experimento foram avaliados os parâmetros hematológicos, radiográficos e as concentrações plasmáticas de aspartato aminotransferase (AST), albumina, colesterol, triglicérides, glicose e ácido úrico. Os dados foram submetidos a análise de variância e as médias comparadas pelo teste de Tukey (P<0,05). A dieta PEL apresentou maior digestibilidade da gordura e do amido que a EXTa e EXTb (P<0,05), bem como tendência à produção de excretas com maior concentração de ácido acético e ácidos graxos de cadeia curta totais (P<0,1). Por sua vez, o girassol apresentou maior digestibilidade da matéria seca (81,3%), matéria orgânica (87,4%), extrato etéreo (97,5%), energia bruta (87,3%) e tendência de maior digestibilidade da proteína bruta (84,0%) quando comparada à médias das rações processadas (matéria seca – 67,9%, matéria orgânica – 76,7%, extrato etéreo – 89,9%, energia bruta – 74,6%, proteína bruta – 77,6%) (P<0,05). A transição de uma dieta com elevada gordura (girassol) para ração balanceada promoveu melhor perfil bioquímico sérico, com redução de glicose (242,7 para 216,0 mg/dl), triglicérides (163,9 para 111,1 mg/dl), colesterol (263,6 para 184,1 mg/dl) e AST (190,8 para 113,5 U/L) (P<0,05). O melhor aporte nutricional das rações experimentais proporcionou melhora nos parâmetros hematológicos e imunocompetência dos papagaios, com maiores concentrações de hemácias, hemoglobina, hemoglobina corpuscular média, leucócitos totais, linfócitos e monócitos, quando comparado aos valores mediante ingestão do girassol (p<0,05). Ao exame radiográfico os papagaios apresentaram redução na largura da ampulheta (coração – fígado) e na relação coração fígado (p < 0,05) após o consumo da ração processada. Foi verificado que o cozimento do amido não modificou o metabolismo dos papagaios, mas a transição de dieta com elevado teor de gordura (54,4%), como o girassol, para as rações balanceadas melhorou o metabolismo reduzindo as concentrações séricas de glicose, triglicérides, colesterol e enzima hepática, além de promover aumento de hemácias e linfócitos.
Studies on food processing and its influence on metabolism are scarce for psittacines. The present study evaluated the consumption, digestibility, serum biochemistry, and radiographic parameters of blue-fronted amazon parrots after the transition from high-fat diet, based on sunflower seed, to a balanced formulation for parrot maintenance. This formulation was processed to obtain three different degrees of starch gelatinization: Pelletized food (PEL) - ingredients ground with a 2mm sieve and pelletized, with 27% of starch cooking; Low cooking extruded feed (EXTL) - ingredients ground with 2 mm sieve and extruded with low energy transference, with 82% of starch cooking; High cooking extruded food (EXTH) - ingredients ground with 0.5 mm sieve and extruded with high energy transference, with 98% of starch cooking. Thirty adults blue-fronted amazon parrots were maintained on the sunflower seed based diet for 90 days, for homogenization of the group and determination of baseline values. Later, they were distributed in a completely randomized design with 10 repetition (parrots) per treatment (experimental food) and fed with the diets for a period of 160 days. Food consumption and palatability, apparent digestibility coefficient of nutrients, concentrations of volatile fatty acids (VFAs - acetic, butyric, propionic, valeric, isovaleric and isobutyric), lactate and ammonia of the excreta and, at the beginning and at the end of the experiment hematological, radiographic and plasma concentrations of aspartate aminotransferase (AST), albumin, cholesterol, triglycerides, glucose and uric acid were determined. The data were submitted to analysis of variance and the means compared by the Tukey's test (P <0.05). The PEL food presented higher fat and starch digestibility than the EXTL and EXTH (P<0.05) and a tendency for higher excreta concentrations of acetic acid and total short chain fatty acids (P<0.1). On the other hand, sunflower seed presented higher digestibility of dry matter (81.3%), organic matter (87.4%), fat (97.5%), crude energy (87.3%), and crude protein (84.0%) than the mean of the formulated foods (P<0.05; dry matter - 67.9%, organic matter - 76.7%, fat - 89.9%, crude energy - 74.6%, crude protein - 77.6%). The transition from a high fat diet (sunflower seed) to a balanced food improved the serum biochemical profile, reducing the concentrations of glucose (from 242.7 to 216.9 mg/dl), triglycerides (from 163.9 to 111.1 mg/dl), cholesterol (from 263.6 to 184.1 mg/dl) and AST (from 190.8 to 113.6 U/L)(P<0.05). The better nutrient profile of the formulated foods improved blood parameters and immunocompetence, with higher concentrations of hemoglobin, mean corpuscular hemoglobin, total leukocytes, lymphocytes and monocytes than when the parrots were fed with sunflower seeds (P<0.05). The radiographic exam showed a reduction in the width of the hourglass (heart - liver) and heart - liver ratio after the intake of the formulated foods (P<0.05). Food processing did not modify the metabolism of parrots, but the transition from a high-fat diet (54.4%), such as sunflower seeds, to balanced diets improved parrot metabolism reducing serum glucose, triglycerides, cholesterol and liver enzyme concentrations, improving the production of red cells and lymphocytes.
Studies on food processing and its influence on metabolism are scarce for psittacines. The present study evaluated the consumption, digestibility, serum biochemistry, and radiographic parameters of blue-fronted amazon parrots after the transition from high-fat diet, based on sunflower seed, to a balanced formulation for parrot maintenance. This formulation was processed to obtain three different degrees of starch gelatinization: Pelletized food (PEL) - ingredients ground with a 2mm sieve and pelletized, with 27% of starch cooking; Low cooking extruded feed (EXTL) - ingredients ground with 2 mm sieve and extruded with low energy transference, with 82% of starch cooking; High cooking extruded food (EXTH) - ingredients ground with 0.5 mm sieve and extruded with high energy transference, with 98% of starch cooking. Thirty adults blue-fronted amazon parrots were maintained on the sunflower seed based diet for 90 days, for homogenization of the group and determination of baseline values. Later, they were distributed in a completely randomized design with 10 repetition (parrots) per treatment (experimental food) and fed with the diets for a period of 160 days. Food consumption and palatability, apparent digestibility coefficient of nutrients, concentrations of volatile fatty acids (VFAs - acetic, butyric, propionic, valeric, isovaleric and isobutyric), lactate and ammonia of the excreta and, at the beginning and at the end of the experiment hematological, radiographic and plasma concentrations of aspartate aminotransferase (AST), albumin, cholesterol, triglycerides, glucose and uric acid were determined. The data were submitted to analysis of variance and the means compared by the Tukey's test (P <0.05). The PEL food presented higher fat and starch digestibility than the EXTL and EXTH (P<0.05) and a tendency for higher excreta concentrations of acetic acid and total short chain fatty acids (P<0.1). On the other hand, sunflower seed presented higher digestibility of dry matter (81.3%), organic matter (87.4%), fat (97.5%), crude energy (87.3%), and crude protein (84.0%) than the mean of the formulated foods (P<0.05; dry matter - 67.9%, organic matter - 76.7%, fat - 89.9%, crude energy - 74.6%, crude protein - 77.6%). The transition from a high fat diet (sunflower seed) to a balanced food improved the serum biochemical profile, reducing the concentrations of glucose (from 242.7 to 216.9 mg/dl), triglycerides (from 163.9 to 111.1 mg/dl), cholesterol (from 263.6 to 184.1 mg/dl) and AST (from 190.8 to 113.6 U/L)(P<0.05). The better nutrient profile of the formulated foods improved blood parameters and immunocompetence, with higher concentrations of hemoglobin, mean corpuscular hemoglobin, total leukocytes, lymphocytes and monocytes than when the parrots were fed with sunflower seeds (P<0.05). The radiographic exam showed a reduction in the width of the hourglass (heart - liver) and heart - liver ratio after the intake of the formulated foods (P<0.05). Food processing did not modify the metabolism of parrots, but the transition from a high-fat diet (54.4%), such as sunflower seeds, to balanced diets improved parrot metabolism reducing serum glucose, triglycerides, cholesterol and liver enzyme concentrations, improving the production of red cells and lymphocytes.
Descrição
Palavras-chave
Ácidos graxos voláteis, Extrusão, Gelatinização do amido, Metabolismo, Peletização, Psitacídeos, Volatile fatty acids, Extrusion, Starch gelatinization, Metabolism, Pelletization, Psittacines