Effect of olive leaf powder on the performance and ileal bacterial count of broilers

This experiment was conducted to investigate the effects of olive leaf (OL) on the performance, abdominal fat pad and some ileal bacterial population of Cobb broiler chickens. A total number of ۴۰۰ day-old chicks were randomly distributed into floor pens and reared under the same condition until ۱۴ days of age. On day ۱۴, each pen was randomly assigned to one of the five experimental treatments with four replicates of ۲۰ male and female chicks. The dietary treatments were consisted of a control group which fed basal diet without OL entire period of the study and groups ۲ to ۵ that fed diets supplemented with ۰.۲۵, ۰.۵۰, ۰.۷۵ and ۱.۰۰% OL powder, respectively. On days ۲۱ and ۴۲ of the experiment, ileal digesta samples were collected under the sterile condition to evaluate ileal bacterial population. The results indicated that birds fed diets containing various levels of OL, had higher body weight gain (except for ۱.۰۰% OL) and lower feed conversion ratio compared to that of the control group. Dietary inclusion of OL resulted in a higher count of Lactobacillus sp.  compared to the control group on ۴۲ days of age, while Escherichia coli count significantly was not influenced. The abdominal fat pad was lower in birds fed OL supplemented diets. In conclusion, findings of the current experiment showed that the OL had positive effects on feed conversion ratio, abdominal fat pad deposition and ileal bacterial count of broiler chickens.

Keywords:

Abdominal fat , Additive , Broiler , Growth Promoter , Olive leaf