Rosane Marina Peralta

Digestibilidade e atividade enzimática intestinal de coelhos em crescimento alimentados com diferentes fontes de amido processadas ou não por extrusão

Two experiments were carried out to study the digestibility of starch and the specific activity of amylase (ACAMY) and maltase (ACMAL) enzymes in two portions of small intestine (jejunum and ileum), in rabbits with initial ages of 28 and 49 days, fed with four sources of starch (corn, sorghum, triticale and cassava) processed or not by extrusion. Sixty-four White New Zealand rabbits were used in each experiment, distributed in a completely randomized design with eight treatments and eight replications. At the end of the experimental period, the animals were slaughtered for retreat of sample of jejunum and ileum content, besides of scraping of mucous membrane of jejunum for the determination of ACAMY and ACMAL. The processing improved the digestibility coefficient (DC) of starch of corn and sorghum. Among the sources non-extruded, the higher DC of starch was presented by triticale and cassava. The ACAMY of jejunum wall was higher in the 60 days. The ACMAL in the jejunum and ileum content was higher in the 37 days. The different sources of starch differ one of the other ones with relationship the ACAMY and ACMAL of the jejunum and ileum content. The ACMAL showed to be higher in the jejunum. The ACAMY in the jejunum content was higher in the 60 days to the animals that received extruded corn and sorghum. The ACAMY in the 37 days was higher in the ileum than in the jejunum to the animals that received corn and sorghum. The results allow concluding that the processing was effective to the corn and sorghum, however, all sources, processed or not, showed good DC of the starch, could be used in rabbit feeding.

Digestibilidade de Duas Fontes de Amido e Atividade Enzimática em Coelhos de 35 e 45 Dias de Idade

The research was carried out to evaluate the ileal (ILEALDC) and total (TOTALDC) digestibility of the starch and the activity of the enzymes amylase (ACAMY) and maltase (ACMAL) in rabbits of 35 and 45 days old, fed with starch from the corn or cassava. In each assay 20 New Zealand White rabbits were used, being ten males and ten females, housed individually in wire cages and distributed in an entirely random arrange. At the end of the experimental period, the animals were killed for retreat a sample of the digestive content of a portion of the jejunum and ileum. ILEALDC and TOTALDC of the starch from cassava (59.25±1.38% and 99.89±0.04%, respectively) were higher than starch from corn (54.21±1.51% and 99.21±0.05%, respectively). TOTALDC of the animals at 45 days old was higher than animals at 35 days old (99.75± 0.04% vs 99.35±0.05%). ACAMY in the jejunum and ileum contends was higher in the animals at 45 days old (0.952±0.118 mmol glucose/mg/min and 0.647±0.093 mmol glucose/mg/min, respectively) than 35 days old (0.469±0.111 mmol glucose/mg/min and 0.375±0.088 mmol glucose/mg/min). ACMAL was higher in animals fed cassava than corn (0.061±0.007 mmol glucose/mg/min vs 0.032±0.007 mmol glucose/mg/min). It can be concluded the starch from cassava is more digestible than starch from corn, and the enzymatic system of the rabbits with 35 days old are not still sufficiently developed so that it happens the highest starch digestion.