|Support type:||Scholarships in Brazil - Master|
|Effective date (Start):||August 01, 2013|
|Effective date (End):||January 31, 2015|
|Field of knowledge:||Agronomical Sciences - Animal Husbandry - Animal Nutrition and Feeding|
|Principal researcher:||Valquíria Cação Cruz-Polycarpo|
|Home Institution:||Universidade Estadual Paulista (UNESP). Campus Experimental de Dracena. Dracena , SP, Brazil|
The probiotics and organic acids action administered in the pre-starter and starter phase of broilers may influence the microorganisms and the gastrointestinal tract conditions. However, there are few researches on the use of these additives tested synergistically. To do so, it will be conducted an experiment in which will be used 900 1-d-old male Cobb chicks allotted in a completely randomized design featuring a 2x2+1 factorial arrangement (supplementation with probiotics or not), (supplementation with organic acids or not) and (basal diet with inclusion of antibiotics and anticoccidial), with six replicates of 30 birds per replicate, in a density of 12 birds/m². The treatments will consist of: T1- basal diet - without addition of antibiotics and anticoccidial; T2- basal diet with probiotics addition, T3- basal diet with organic acids addition; T4- basal diet with probiotics and organic acids addition; T5 basal diet with addition of antibiotics and anticoccidial. Data will be evaluated on the performance, organs weight, length of small and large intestines, intestinal morphometry, intestinal contents pH and gastrointestinal tract microbiota of broilers in the pre-starter and starter phases. Statistical analysis of the data will be done by analysis of variance (ANOVA) with the GLM procedure of SAS (2008). To identify significant differences between the treatment means Tukey test at 5% probability will be used.