RESUMOAvaliou-se a alometria de órgãos digestórios e morfometria da mucosa intestinal, atividade de enzimas pancreáticas e perfil bioquímico sérico de frangos de corte de crescimento lento e rápido. O delineamento experimental utilizado foi de blocos ao acaso, com dois tratamentos (linhagens Isa Label e Cobb) e cinco repetições de 10 aves cada. Aos sete, 21 e 42 dias de idade, duas aves por repetição foram abatidas e o sangue e pâncreas foram coletados. As aves de crescimento lento apresentaram maior peso relativo órgãos digestórios, exceto para o peso do fígado e intestino delgado aos sete e 42 dias de idade, respectivamente. A linhagem Cobb apresentou maior altura de vilo no jejuno, íleo aos sete dias e duodeno aos 42 dias de idade. Os níveis séricos de Ca, P e triglicerídeos foram superiores nas aves Isa Label apenas aos 21 dias de idade. O peso relativo, atividade da amilase e lipase do pâncreas não diferiram entre as linhagens. Conclui-se que existem particularidades das linhagens Isa Label e Cobb quanto ao desenvolvimento dos órgãos do sistema digestório e parâmetros séricos bioquímicos. Palavras-chave:Enzimas digestivas, linhagens Isa Label e Cobb, mucosa intestinal, sistema digestório, soro Morphological and morphometric aspects of the digestive apparatus, serum biochemical measures and activity of pancreatic enzymes of slow-and fast-growing broilers ABSTRACTWe evaluated the biometry of digestive organs, morfometry of intestinal mucosa, pancreatic enzymes activity and serum biochemical parameter of slow-and fast-growing chicken genotypes. We used a randomized block experimental design with two treatments (Isa Label and Cobb strains) and five replicates with 10 broilers per experimental unit. In order to measure the evaluated parameters, two birds of each replicate were slaughtered at seven, 21 and 42 d of age. The Isa Label broilers presented relative weight of all components of the digestive tract, except for the weight of the liver and small intestine at seven and 42 days, respectively. Villus height was higher for Cobb than for Isa Label in the jejunum and ileum at seven days, and duodenum at 42 days of age. The relative weight, amylase and lipase activity of the pancreas did not differ between strains at different ages of assessment Relative weight and amylase and lipase activity of pancreas did not differ between strains at different ages. The serum Ca, P and triglyceride levels were higher in Isa Label birds only at 21 days of age. We concluded that Isa Label and Cobb strains present peculiarities regarding the development of the digestive system organs and the serum biochemical parameters.

This study aimed to test the effects of dietary Aloe vera and Symphytum officinale extracts added separately or in combination with symbiotics on the performance, nutrient utilization, serum biochemical parameters, biometrics, and intestinal histomorfometry of broilers. The experiment had a randomized block design with five treatments and six replicates of ten broilers each. Treatments were as follows: negative control and positive control (diet without and with antibiotic, respectively); 0.2% Aloe vera (AV); 0.2% Symphytum officinale (S); 0.2% functional supplement, composed of symbiotics fermented in Aloe vera and comfrey plant extracts (S+PE). At seven days of age, FI of birds fed the Aloe vera extracts diets were lower than that observed for birds consuming the diet with Symphytum officinale extract and S+PE. Broiler performance remained unaffected by treatments at others ages evaluated. At 10 to 14 days of age the lowest ADCDM ADCCP was shown in group feed NC. The highest ADCCP was observed in PC control group and in diets supplemented with Aloe vera and S+PE. Serum levels of cholesterol, triglycerides, and phosphorus were affected by addition of extracts at seven, 21, and 35 days of age. The longest duodenal villi were observed in broilers fed S+PE diets at seven days of age. Aloe vera and Symphytum officinale extracts and symbiotics can be used in broiler diets as an alternative to growth-promoting antibiotics. Key words: Antibiotics. Digestibility. Histomorphometry. Performance. Serum parameters. ResumoCom este projeto objetivou-se verificar o efeito da inclusão individual dos extratos vegetais de Aloe vera e Symphytum officinale e da associação de um simbiótico com estes extratos sobre o desempenho, aproveitamento nutricional, parâmetros séricos bioquímicos, biometria e histomorfometria intestinal de frangos de corte. O delineamento experimental utilizado foi em blocos casualizados com cinco tratamentos e seis repetições de 10 aves cada. Os tratamentos foram: Controle Negativo, Controle Positivo (rações sem e com antibiótico, respectivamente), inclusão 0,2% Aloe vera; 0,2% Symphytum officinale e 0,2% suplemento funcional (simbióticos+extratos vegetais, S+EV). Aos sete dias de idade, foi observado menor consumo de ração nas aves alimentadas com ração contendo extrato de Aloe vera do que nas aves alimentadas com extrato de Symphytum officinale e S+EV. O desempenho das aves não foi afetado pelos tratamentos em nenhuma das idades avaliadas. Aos 10 a 14 dias de idade, o menor CMAMS e CMAPB foram observados nas dietas do grupo controle negativo. A maior CMAPB foi observada no grupo controle positivo e em dietas suplementadas com Aloe vera e S+EV. As concentrações séricas de colesterol, triglicérideos e fósforo foram afetadas pela adição dos extratos aos sete, 21 e 35 dias de idade. A maior altura de vilosidades do duodeno foi observada aos sete dias de idade para o S+EV. A utilização dos extratos de Aloe vera, Symphytum officinale e do simbiótico na dieta de frangos de corte representa uma alternativa...

In this study were evaluated the use levels of Noni extract (Morinda citrifolia) on intestinal histomorphometry, nutritional metabolism, biochemical serum profile, and performance of broilers. Completely randomized design with six treatments and six replicates of ten male commercial Cobb chicks were used in each replicate. The broilers was spraid treatments with addition to the diet of 150, 300, 450, and 600 ppm of noni extract, beyond negative and positive controls, without or with 25 ppm of tylosin, respectively. Feed intake, weight gain, feed conversion of broilers at 7, 21, and 35 days old were evaluated at the performance test. The nutrient metabolization was determined using the method of total excreta collection. At 7, 21, and 35 days old, the two birds per replicate was collected, after blood collection, the birds were euthanized to histomorphometry of the intestinal segments. Data were subjected to regression analysis, considering linear and quadratic models for variance analysis. Subsequently, treatments with Noni levels were compared with the negative and positive controls, using the F test for orthogonal contrasts. The inclusion of noni in the diet of plant extracts does not change the performance, carcass characteristics, biometrics of the digestive system, intestinal histomorphometry, and biochemical serum profile of broilers, in relation to diet without growth promoter. Therefore, although it is not hepatotoxic, noni extract did not improve growth in broilers.