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Genetic Studies on Pure, Crossbreds and Reciprocal Crosses of four Color Plumaged Meat Lines

KrishiKosh

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Title Genetic Studies on Pure, Crossbreds and Reciprocal Crosses of four Color Plumaged Meat Lines
 
Creator Venugopal, S.
 
Contributor Narasimha Murthy, H. N.
 
Subject crossing over, biological phenomena, body weight, eggs, genetics, breeding methods, livestock, productivity, egg production, developmental stages
 
Description Genetic studies on pure, crossbreds and reciprocal crosses of four color plumaged meat lines was conducted to evaluate four color plumaged meat lines viz. PB1, UM1, IC3and NG (New genotype) and their crosses in a diallele crossing model (eight sires and 64 dams in each line). Sixteen genetic groups comprising of four parent lines and 12 crossbreds including reciprocals were evaluated for growth traits, production traits and genetic parameters of parental lines. Parental lines PB1 and NG recorded higher body weight of 1352±9.60 and 1405±16.50g, respectively, at six weeks. Among crosses including reciprocals body weight varied from 916.80±18.10 in IC3xUM1 to 1387.33±13.09g in NGxPB1. Crosses involving PB1 and NG lines expressed higher body weight compared to IC3 and UM1 crosses. Feed efficiency among crosses and reciprocals was better compared to pure lines. The survivability per cent was more than 96 per cent among all genotypes during first three weeks. Considerable reduction of ASM has been recorded among crosses when compared to parental lines. Survivor egg production up to 52 weeks of age was higher among crosses compared to parental lines.

Significantly (p≤0.05) higher egg production was recorded in genotype UM1xPB1 (102.52±3.49 eggs). Heterosis for six week body weight among some crosses was of low to medium magnitude. Heterosis for egg production among all crosses ranged from - 18.78 to 13.80 per cent for egg production up to 52 weeks. Heritability estimates of body weights up to six weeks in PB1 and NG were low to moderate in magnitude and moderate to high in UM1 and IC3. Genetic correlations between BW20 and ASM was positive and of lower magnitude in all the pure lines. Negative genetic correlations obtained between ASM and egg weight traits as well as BWSM and egg weight traits in all parental lines. PB1 and UM1 contributed significant GCA effects of 6.36 and 4.23, respectively, for weight at six weeks. PB1 showed positive SCA effect as male parent line with NG for body weight and with IC3 for ASM, EW52 and EP52. UM1 showed positive SCA as male line with NG for EP52 (3.66). It was concluded that PB1 and NG can be utilized for colored broiler production. UM1 can be further improved as female line by selection for egg production.
 
Date 2016-06-23T11:03:42Z
2016-06-23T11:03:42Z
2014-05-15
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/67822
 
Language en
 
Format application/pdf
 
Publisher Karnataka Veterinary, Animal and Fisheries Sciences University, Bidar