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Subject: Animal Nutrition × Author: BARMAN, AJAY × Start date: 2000 ×
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    ThesisItemOpen Access
    EFFECT OF DIETARY SUPPLEMENTATION OF ZINC NANO-PARTICLES ON GROWTH PERFORMANCE OF CROSSBRED CALVES
    (College of Veterinary Science, Assam Agricultural University, Khanapara, Guwahati, 2022-01) BARMAN, AJAY; Borah, Lakhyajyoti
    An experiment was conducted to evaluate the effect of dietary supplementation of zinc nano-particles (nano-ZnO) on growth performance, nutrient utilization, serum biochemical parameters and cost per kg weight gain in crossbred calves. A total twenty four crossbred calves of average body weight 91.77±1.90 and about 6-8 months of age were randomly selected and divided into 3 groups (T0, T1 and T2) of 8 nos each. Experimental calves were provided with green roughage, paddy straw and standard concentrate ration supplemented with inorganic zinc @40 mg/kg DMI in T0, nano-zinc oxide @10 mg/kg DMI in T1 and nano-zinc oxide @20 mg/kg DMI in T2. The concentrate ration was prepared as per BIS, 2013 by using conventional feed ingredients viz. maize, wheat bran, rice polish, GNC, MOC, mineral mixture and salt. The feeding trial was carried out for 84 days. Blood collection was done at 0, 42nd and 84th day for blood biochemical parameter estimation. Humoral immune and cellular immune responses were observed during the end days of the trails. At the end of the feeding trial metabolic trials was conducted for 5 days with 5 animals from each group. The feed intake in crossbred calves was not affected due to the supplementation of nano-ZnO. However, the total body weight gain and average daily gain were significantly (P<0.01) higher in the nano-ZnO supplemented groups than the inorganic zinc supplemented group. Feed conversion ratio was significantly (P<0.01) better in the groups supplemented with nano-ZnO i.e. T1 and T2 compared to the T0. No significant difference was observed among the groups in respect of digestibility coefficient of the DM, OM, CP, EE, CF, NFE, ADF, NDF and retention percentages of nitrogen, calcium and phosphorus. The percent CP and TDN received (as per ICAR, 2013) were comparable among the groups. The haematological parameters viz. serum cholesterol, serum triglycerides, serum creatinine, serum gamma glutamyl transferes, serum albumin: globulin were not significantly affected by supplementation of nano-ZnO. But, superoxide dismutase was significantly (P<0.01) higher in the groups supplemented with nano-ZnO compared to the inorganic zinc supplemented group. Significantly better humoral immunity and cell mediated immunity response was observed in T1 and T2 groups than the T0 group. The relative feed cost per kg weight gain was low in the T2 than other groups. The present study revealed that the supplementation of nano-ZnO up to 20 mg/kg in calf ration is beneficial in terms of body weight gain, feed conversion ratio, immune response and economics of feeding.