Combining ability of commercial hybrid laying hens from diallel crosses
1997
Phuphan Rattanapakdee
Breeding selection for improvement of commercial hybrid laying hen by diallel crossing is the method for selection the appropriate lines from numerous stocks. The results of the diallel crossing are general combining ability (GCA) and specific combining ability (SCA) which observed for selection of suitable breeds. Six strains of one pure strain of Rhode Island Red and five strains from commercial stocks were allocated with a 6X6 diallel crosses performed by Griffing (1956a) as the parents and set of F1's are included but not reciprocal F1's. Twenty one possible combinations were exhibited. The significant results were revealed in egg production up to 354 days of age and egg weight at 354 days of age (P0.05) whereas there were no significant differences in body weight at 20 weeks of age, age at first egg, egg production up to 262 days and egg weight at 262 days of age (P0.05). The genetic effects, GCA was shown significant differences in age at first egg (P0.01), egg production up to 262 and 354 days of age (P0.01) and egg weight at 262 and 354 days of age (P0.01), but body weight at 20 weeks of age was found no significant difference (P0.05). The SCA had significant effects on all parameters, body weight at 20 weeks of age (P0.05), age at first egg (P0.01), egg production up to 262 and 354 days of age (P0.01) and egg weight at 262 and 354 days of age (P0.01).
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