Hematological responses of common carp Cyprinus carpio administered with Neem (Azadirachta indica) leaf extraction Kaur Yadwinder, Dhawan Asha, Holeyappa Shanthanagouda Admane*, Thammegowda Naveenkumar Bilekallu College of Fisheries, Guru Angad Dev Veterinary and Animal Sciences University, Ludhiana-141 004, Punjab, India *Corresponding author's e-mail: shanthanagouda@gmail.com
Online published on 15 March, 2019. Abstract The study investigated the effect of Neem Leaf Extract (NLE)-a herbal product on hematological parameters of common carp, Cyprinus carpio. Common carp fry were fed on diets having different levels of NLE [no NLE (D1), 0.25(D2), 0.5(D3), 1.0(D4), 1.5(D5), 2.0(D6) g/kg in basal diet containing rice bran and mustard] for 180 days in outdoor tanks. The results revealed an increase in TEC, TLC and PCV in groups D2-D6 compared to control (P<0.05), but increased PCV was observed only in D2, D3 and D4 groups. Further, increasing trend for Hb content was observed from D2-D6 irrespective of NLE levels. The MCV values decreased with increase in levels of NLE in contrast to MCHC, whereas MCH considerably varied among the treatments. Significantly increased total protein and globulin was also observed while albumin to globulin ratio did not show any response in any of the treatments. Collectively, these observations support the hypothesis that the response of hematological parameters to NLE treatment is regulated via both positive and negative feedback mechanisms, with differential modulations based on the NLE levels. The results imply that NLE can boost the immune system via hematological parameters by increasing TEC, TLC, PCV, Hb at certain levels. Top Keywords Azadirachta indica, Aquaculture, Common carp, Hematology, Herbal extract. Top |