Effects of different levels of Rosa canina L. fruit on performance, egg traits, biochemical parameters and blood immune cells of laying hens

In this experiment for evaluation the effects of different levels of Rosa canina L. fruit on performance, egg traits and blood parameters, total of 288 Hy-line (W36) laying hens from 35 to 46 weeks were allocated to the experimental units in a completely randomized design in 6 treatments with 4 replicates of 12 hens each replicate. The dietary levels of Rosa canina L. fruit included in the study were: 0, 1, 2, 3, 4, and 5 % of diets. The results showed that use of Rosa canina L. fruit up to 5% in diets improved the egg production, egg quality traits and blood parameters compared to the control group (P<0.05). The best performance, the lowest feed price for each kilogram of eggs, the best egg quality traits and the lowest amount of uric acid in blood were observed with 3% of Rosa canina L. fruit. The lowest amounts of hematocrit, hemoglobin and red blood cells were seen in diet with 5% of Rosa canina L. fruit. Whereas, the lowest percentage of heterophle and the lowest ratio of heterophle/lymphocyte were observed with 2% of Rosa canina L. fruit. The overall results indicated that in laying hens, 3% of Rosa canina L. fruit in contrast with other experimental groups, significantly improve performance, egg quality traits, blood parameters and feed price for each kilogram of eggs.