Research On Animal Production

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Soroush S Z, Hosseini-Vashan S J, Afzali N, Allahressani A. (2020). Effects of Olive Leaves Extract and Olive Oil on Growth Performance, Nutrient Digestibility and Ileum Morphology of Japanese Quails. Res Anim Prod. 11(28), 11-21. doi:10.52547/rap.11.28.11
URL: http://rap.sanru.ac.ir/article-1-1047-en.html

 The present study was conducted to determine the effects of olive extract leaf and olive oil on growth performance, nutrient digestibility, carcass characteristics and intestinal morphology in Japanese quail. A total of 528 Japanese quail chicks 1-days-old were allocated to 6 treatments group with 4 replicates each containing 22 birds. This study was performed in a 2×3 factorial experiment with completely randomized design. Experimental treatments were included two levels of olive leaf extract (0, and 400 mg/kg) and three levels of olive oil (0, 2.5 and 5%). The results was revealed that the average daily weight gain were significantly increased in diet containing 5 % of olive oil compared to control group (P<0.05). The diet containing 2.5 percent olive oil decreased average daily feed intake as compare to control diet (P<0.05). The ileum  histomorphometry showed that crypt depth and height villus to crypt depth ratio in birds received 2.5 and 5% olive oil decreased and increased compared with control group, respectively (P<0.05). The results showed that the apparent digestibility of protein, ash, fat, phosphorus and energy in the control group was significantly lower than other treatments (P<0.05). The apparent digestibility of fiber was higher in the treatment containing 5% olive oil and the treatment containing 400 mg/kg diet of olive leaf extract (P <0.05). Diet containing 5% olive oil had the highest metabolizable energy compared to the other experimental groups (P <0.05). In conclusion, the findings of this study suggests that dietary inclusion of olive oil up to 5 percent had benefit effects on quail production indices.