The aim of this study was to evaluate the effect of the addition of oregano essential oils (OEO) in the diet on duodenal morphometry of Cobb 500 broilers. In total, 400 chickens distributed in five treatments were used: supplementation with OEO (100, 200, 300 ppm) and two control treatments (commercial oregano [250 ppm] and growth-promoting antibiotic [300 ppm]), for six weeks, fed ad libitum with weekly formulated diets. The morphometric study was carried out with the help of a camera coupled to the microscope using AmScope 3.0 software, a 4x objective, covering an area of 2000 µm2. The variable proximal width of the villi was significantly greater (183 µm) in the OEO 300 ppm treatment at 21 days of age and the variable proximal depth was significantly greater (256 µm) in the OEO 300 ppm treatment at 42 days (p<0.05). It is concluded that the addition of OEO in doses of 300 ppm po...

In recent times, the use of lysophospholipids (LFL) in the poultry industry has become relevant due to their emulsifying action. For this reason, an experiment was carried out to evaluate the LFL incorporated in the diet of COBB 500 chickens in three growth phases on the productive response. The LFL source used was the one contained in Lipidol®. A total of 288 chickens aged 1-42 days were used in a completely randomized design with a 4x3 factorial arrangement, with factor A being four levels of Lipidol (0, 0.50, 0.75, 1.0 kg/t of feed) and factor B being three periods of use (1-7; 1-15, 1-21 days). Accumulated weekly weight (AWW), daily weight gain (DWG), weekly feed consumption (WFC) and feed conversion (FC) were evaluated. The inclusion levels and periods of use (PU) of the LFLs improved AWW, DWG and WFC (p<0.01); however, PUs did not affect FC. It is concluded that the productive ...