Growth Performance, Gut Health, Welfare and Qualitative Behavior Characteristics of Broilers Fed Diets Supplemented with Dried Common (Olea europaea) Olive Pulp

The present study investigated the dietary impact of dried olive pulp (OP) on growth performance, gut health and some welfare and behavior characteristics of broilers. It was conducted in a commercial poultry farm using 108 13 day-old Ross male broilers. Chickens were equally and randomly assigned to 3 dietary treatments, CON, OP3 and OP6, based on the incorporation rate of OP in the ration (0%, 3%, and 6%, respectively). A beneficial impact on foot pad dermatitis (FPD) and feather cleanliness of OP-fed broilers was recorded. No adverse effects on qualitative behavior characteristics evaluated and on the overall growth performance of chickens were observed. No significant differences in the fecal microbiota population were observed among the groups. Changes of β-diversity in an age-dependent way were only observed. The feces of chickens across all age and dietary groups were mainly dominated by the phylum Firmicutes (62.3 to 95.1%), mainly represented by the genus Lactobacillus (32.9 to 78.2%), Proteobacteria (2.0 to 35.6%), and Actinobacteria (1.5 to 11.4%). Supplementing broilers’ diets with 3% and 6% OP beneficially affected chickens’ health and welfare without compromising their growth performance and gut health.