KHANNA, KULDEEPSONAWANE, JEEVAN PARASHARAM2018-05-252018-05-252007http://krishikosh.egranth.ac.in/handle/1/5810047500The different breeds used as female line to produce experimental crossbreds were AK, AP, K, F, NN, RIR and IWP strain of WLH whereas B was used as male line. The only reciprocal cross produced was RIR X B. Thus, a total of eight different crossbreds were evolved for the present study. Simultaneously purebred population of K, AK, AP, NN, F and RIR were produced and maintained in three replicate as a control for comparison. The crossbreds were compared among themselves for body weight, weight gain, total feed consumption, FCR, and mortality, heterosis, economics in terms of EPEI and crossbreds were also compared for body weight and weight gain with purebreed control of each crossbred. The results for reproduction traits revealed that percent fertility was higher in all purebreds as compared to their crossbreds whereas hatchability on TES and FES basis was found to be higher in all crossbreds as compared to their purebreds except in F. The BWLH and BF had higher fertility and hatchability on TES and FES basis as compared to other crossbreds. The results revealed significant (P < 0.01) difference between crossbreds and purebreds population for body weight and weight gain. Among the crossbreds genetic group had significant (P< 0.05) effect on body weight at all ages and sex had significant (P< 0.05) effect at 4, 6, 8 and 10 wks of age. The interaction of genetic group and sex was found to be significant (P< 0.05) for body weight at 4, 6, and 10 wk of age. The overall mean values for body weight showed that BF performed better sexwise as well as on combined sex. Among the crossbreds genetic group had significant (P< 0.05) effect on weight gain at all ages except for G7184 and sex also had significant (P< 0.05) effect at all ages except for GO 14. The interaction of genetic group and sex was found to be significant (P< 0.05) for body weight gain for GO 14 and G2942.0verall mean values of weight gain for BF were better as compared to other crossbreds. Percent heterosis for final body weight of different crossbreds was found to be maximum of BF (16.11) whereas BK showed negative (-3.96) heterosis while the percent increase in body weight of different crossbreds over parental female line was found to be ranged between 34.71 (BAK) to 43.54 (BK). Analysis of variance for total feed consumption revealed that genetic group had significant effect (P < 0.05) at all intervals except for TFC7184 and effect of sex was found to be non significant at all stages except for TFC098.On combined sex, lowest total feed consumption (kg) was observed in BAP (4.387) and highest was in RIRB (4.593) while lowest total feed consumption up to 70 days in male was observed in BAP (4.311) and highest was recorded in RIRB (4.616). Lowest total feed consumption up to 98 days in females was observed in BF (6.95) and highest was in RIRB (7.119).During 0-10 wk period on combined sex basis, the best converter of feed was found to be the BF (3.24) while the poorest converter of feed was the BK (4.27). During 0-10 wk period in males, the best converter of feed was found to be the BF (3.02) while the poorest converter of feed was the BK (4.01) whereas in females during 0-14 week period BF was the best converter of feed (3.67) and BK was the poorest feed converter (4.76). Analysis of variance for FCR revealed that genetic group had significant (P<0.05) effect at various intervals among various crossbreds and sex had significant (P < 0.05) effect at all intervals except for FCR014. The interaction between genetic group and sex was found to be significant (P < 0.05) only for FCR1528. During experimental period the BK, BAK and BF had no mortality whereas BRIR had highest (2.50 %) mortality up to 14wk age while in purebred control the percent mortality ranged from 3.33 (K) and 16.66 (AP). Economics in terms of European Performance Efficiency Index (EPEI) was calculated for each crossbred, lowest EPEI was observed in BK (34.85) and highest EPEI was observed in BF (60.11) whereas overall average in crossbred was 48.55.enPoultry ScienceA StudyThesis