The effects of different diets and dietary transition on the performance and morphology of the digestive tract of pacu larvae fed two commercial formulated diets and an experimental microencapsulated diet produced by internal gelation were evaluated. Four-day old pacu larvae received the following treatments: only artemia nauplii in increasing amount during the experiment (positive control); larvae maintained at fasting (negative control); three types of formulated diets throughout the experiment (experimental microencapsulated diet, commercial diet NRD1.2/2.0, Inve, USA, and diet Poli-Peixe […]

The objective of this work was to evaluate the effects of levels of nucleotides in diets for weanling pigs on performance, organs morphometry and histology of intestinal epithelium. One hundred and forty-four pigs weaned at 21 days of age and with 5.80 ± 0.16 kg initial live weight were used in a completely randomized experimental design with six diets, six replications per diet and four animals per pen (experimental unit). Diets were: Am _ antimicrobial: basal diet with 40 ppm […]

This work was carried out to evaluate levels of L-glutamine and L-glutamate in diets for Nile tilapia juveniles (0.60 ± 0.1 g). A complete randomized experimental design with four diets and three replicates and 90 fish per experimental unit was used. It was used a control diet with 29% of digestible protein and 2,940 kcal/kg of digestible energy supplemented with L-glutamine and L-glutamate at the proportion of 0, 1, 2 and 3% of diet, during 85 days. It was not […]

The development of midgut, liver and pancreas bullfrog tadpoles (Rana catesbeiana) fed commercial diets with 22, 24 or 28% of crude protein (CP) was evaluated. A total of 360 tadpoles, 15 days old, from the same spawning, was allotted to 30 L-boxes, using a density of 1 tadpole/L, kept at 25 °C (±1°C). A completely randomized experimental design with four replications was used. Three tadpoles of each group were collected from 9th to 48th day of feeding, and organs (midgut, […]

This study was carried out to analyse the skin of three species of fish (piavuçu Leporinus macrocephalus, pacu prata Mylossoma sp e piraputanga Brycon hilarii) through histological and morphometrical analysis and resistance tests after hardening. Skin samples from the dorsal region were taken and fixed in Bouin solution for 24 hours. They were embedded in paraffin, cut 5 µm thick and stained by Hematoxylin-eosin technique. The cuts were analyzed by light microscopy. A EMIC dynamometer was used for the physical […]

An experiment was conducted with objective to evaluate the effect of the simple and complex diets on the morpho-fisiologycal gastrointestinal of young pigs, on their pre nursery (7th to 21st day) and nursery phases (21st to 35nd of age). Ninety six crossbreed young pigs (male and females) were allotted to a randomized block design with four treatments, six replications and four young pigs for each experimental unit. It were used diets: two simple; a with 16 and the other with […]

An experiment was conducted with piglets allocated in eight treatments combinations with different types of diet (dry and wet), rations (with and without sweetener) and two types of drinking water (with and without sweetener), offered after weaning to study the effects on histology and intestine enzymatic development. Intestinal villi height, crypt depth, and relation between villi height and crypt depth of duodenum and jejunum, jejunum protein content and enzyme activity of maltase, sucrase and dipeptidase were evaluated. Thirty two Large […]