KHANNA, KULDEEPSHARMA, RAVINDER2018-06-212018-06-212005http://krishikosh.egranth.ac.in/handle/1/5810054937Four hundred twenty straight run "Cobb" day-old commercial broiler chicks of same hatch procured from Charotar hatcheries, Pansora, Anand, were randomly assigned to three dietary treatments viz. Tl: control broiler ration, T2: 5% detoxified castor seed cake based broiler ration and T3: 10% detoxified castor seed cake based broiler ration. There were 140 chicks in each treatment having fourteen replications (10 chicks in each replication). The isocaloric and isonitrogenous experimental rations formulated for two phases of growth were: Broiler Starter (0-4 weeks) and Broiler Finisher (5-6 weeks). The Crude Protein and Metabolizable Energy content of the broiler rations was decided keeping in view the genetic growth attained by "Cobb" during last twelve years. The rations were fortified with adequate vitamin supplements and coccidiostats. The birds were reared in the cage system of housing during the entire experimental period. The average initial body weight of day old chicks of the three treatment groups i.e. T1, T2 and T3 were 44.30±0.249, 43.67±0.291 and 43.90±0.365g, respectively that finally reached to 1513.77±12.315, 1508.96±15.876 and 1497.64±14.663g, respectively in T1, T2 and T3 at the end of 6 weeks. In this respect the treatment groups did not differ (P<0.05) from each other. The respective average body weight gain at the end of 4th week for T1, T2 and T3 was 750.82±6.680, 770.94±8.442, and 704.99±7.864g, respectively, while overall 0-6 week average body weight gain was 1467.99±11.165, 1458.47117.348 and 1452.99±14.479g for treatments T1, T2 and T3, respectively. The total average feed consumption during 0-6 week in Tl, T2 and T3 groups were 2549.74+18.444, 2653.87±16.008 and 2570.45±20.983g, respectively. The intake of broilers in Tl and T3 groups was statistically (P<0.05) similar but both differed from T2 group. Similar was the trend for the overall (0-6 week) average feed conversion ratio (kg/ kg weight gain), which was 1.69±0.011, 1.76±0.020 and 1.72±0.017 in T1, T2 and T3, respectively. The average percent livabilty of broilers in Tl, T2 and T3 groups was 96.4, 96.4 and 98.5, respectively. The European performance efficiency index for treatment groups T1, T2 and T3 during starter phase was 209.81+4.178, 214.5713.422 and 211.63±4.304; and the same during finisher phase respectively was 213.50±2.781, 204.05±4.323 and 207.77±3.667. The dressing yields observed were 1.06±0.04, 0.98±0.03, and 0.99±0.04kg in T1, T2 and T3 groups, respectively. The organs weight in treatment groups Tl, T2 and T3 with respect to Liver (37.61±1.76, 39.71±1.22 and 37.73±1.89g), Gizzard (33.81±1.83, 31.48±0.90 and 28.60±1.25g), Heart (7.79±0.50, 8.25±0.16 and 7.08±0.25g), Spleen (2.81±0.37, 2.66±0.16 and 2.76±0.28g) and Kidney (11.35±1.34, 11.63±0.54 and 11.88±0.49g) were more or less similar. The results of this study indicated that inclusion of detoxified castor seed cake up to 10% level in the broiler ration has no any adverse effect on feed intake, body weight gain, feed conversion ratio, Livability, carcass characteristics and European performance efficiency index.enLIVESTOCK PRODUCTIONA StudyThesis