Patel, M.Mondal, Avijit2019-06-222019-06-222005-05http://krishikosh.egranth.ac.in/handle/1/5810109573A study was conducted to evaluate the productive and reproductive performance of 800 crossbred chickens of 6 genetic groups viz., Kadaknath x Rhode Island Red (KxRIR), Aseel x Rhode Island Red (AxRIR), Aseel x Brown Cornish (AxBC), Kadaknath x Brown Cornish (KxBC), Rhode Island Red x Aseel (RIRxA) and Brown Cornish x Kadaknath (BCxK) which were obtained in three hatches at I.P.F., Pantnagar. Weekly body weight was recorded from day old to 10th week for accessing the growth trend. To study the carcass quality traits six birds from each genetic group were slaughtered at 10th week of age. Eggs collected during 2nd week of laying were used for egg quality analysis. Similarly eggs collected from crossing of two genetic groups were used for calculating reproductive performance. Among the six genetic groups, KxBC showed maximum body weight gain (1023 g) marginally followed by AxBC and miminum in KxRIR (762 g) at 10th week of age. In the conformation traits, keel bone length ranged from 7.12 to 7.29 cm, shank length from 6.06 to 6.57 cm, and breast angle from 58.11 to 61.16° respectively. In Kadaknath crosses, day old body weight exhibited positive correlation with all the growth traits except at 10th week of age. All the conformation traits were found to be positively correlated among themselves and were significant. In carcass traits, AxBC and BCxK were superior in live weight attained closely followed by KxBC and minimum in KxRIR which differed significantly. Dressing (%) ranged from 77 to 81 with maximum recording in AxBC followed by RIRxA and KxRIR. In all the six genetic groups similar trend with respect to live, bled and dressed weight was maintained except in AxRIR and RIRxA. In all the three Kadaknath crosses KxRIR, KxBC, and BCxK the weight of the different cut up parts was in the sequence of breast, thigh, back, drumstick, wing and neck in the decreasing order. Genetic group with maximum and minimum giblet weight recorded maximum and minimum in liver and gizzard weight. Mean egg weight ranged from 41.90 to 46.362 g in the six genetic groups with maximum in RIRxA closely followed by BCxK. Maximum albumen index (0.173) was recorded in the eggs laid by KxBC and minimum (0.087) in AxBC. Mean shape index ranged from 0.34 to 0.365 which did not differ significantly between the genetic groups. RIRxA had the heaviest shell weight closely followed by AxRIR and KxBC. Albumen weight was highest in AxRIR closely followed by BCxK and was least for AxBC. Yolk index ranged from 0.4 to 0.5 except in AxBC where it was 0.35. Haugh Unit ranged from 75 to 77 except in BCxK where it was 80.5. The percent hatchability on TES basis ranged from 36.67 to 54.80 and similarly in FES basis from 72.46 to 88.00. Mortality (%) ranged from 2.94 to 4.73. Aseel crosses had marginally lower mortality than Kadaknath crosses.ennullThesis