Genetic analysis of carcass traits in pigs
1994
Singh, K.P. | Mishra, R.R. | Raheja, K.L. (Animal Genetics Division, I.V.R.I., Izatnagar (India))
Data on carcass quality traits in Landrace and Large White Yorkshire breed of pigs maintained under AICRP, on pig units at Izatnagar, Khanapara, Jabalpur and Tirupati, between 1972 to 1980 were analysed. Information of 1292 pigs produced from 150 sires and 361 dams, on carcass weight, dressing percentage, carcass length and backfat thickness were studied. Variances and co-variances were estimated by iterating on Harvey (1987) method. Analysis was within breed according to a model that included fixed year-sex effects and random sire within year, dams within sire-year and error effects. Heritability estimates were 0.892+-0.16, 0.772+-0.15, 0.883+-0.16 and 0.915+-0.16 for carcass weight, dressing percentage, carcass length and backfat thickness, respectively, in Landrace pigs. However the corresponding estimates in Large White Yorkshire pigs were 0.548+-0.14, 0.491+-0.19, 0.598+-0.14 and 0.907+-0.07, respectively (Half sib correlation method). The genetic correlation between carcass weight and dressing percentage were observed positive and highly significant. Similarly, backfat thickness had highly significant and positive genetic correlation with carcass weight and dressing percentage, whereas, negative and significant correlation observed with carcass length. The present findings also revealed that sire component of variances observed higher as compared to dam component in both the breed. The overall genetic variability was observed higher in Large White Yorkshire sires.
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