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Báo cáo sinh học: "Multivariate restricted maximum likelihood estimation of genetic parameters for growth, carcass and meat quality traits in French Large White and French Landrace pigs A Ducos JP Bidanel V"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Multivariate restricted maximum likelihood estimation of genetic parameters for growth, carcass and meat quality traits in French Large White and French Landrace pigs A Ducos JP Bidanel V | Genet Sei Evol 1993 25 475-493 Elsevier INRA 475 Original article Multivariate restricted maximum likelihood estimation of genetic parameters for growth carcass and meat quality traits in French Large White and French Landrace pigs A Ducos1 JP Bidanel1 V Ducrocq1 D Boichard 1 E Groeneveld2 1 INRA Station de Génétique Quantitative et Appliquée Centre de Recherche de Jouy-en-Josas 78352 Jouy-en-Josas Cedex France 2 IAHAB Federal Research Centre 3057 Neustadt 1 Germany Received 22 February 1993 accepted 3 May 1993 Summary - Genetic parameters of 7 traits measured in central test stations - average daily gain ADG1 feed conversion ratio FCR and backfat thickness ABT measured on candidates for selection and average daily gain ADG2 dressing percentage DP estimated carcass lean content ECLC and meat quality index MQI measured in slaughtered relatives - were estimated for the Large White LW and French Landrace LR breeds using a derivative free restricted maximum likelihood DF-REML procedure applied to a multiple trait individual animal model. The data consisted of 2 sets of records 3 671 and 3 630 candidates 3 039 and 2 695 slaughtered animals in respectively LW and LR breeds collected at 3 different stations from 1985-1990 LW or 1980-1990 LR . The models included additive genetic value common environment of birth litter and residual random effects a fixed year X station X batch or year X station X slaughter date effect and for traits measured in slaughtered animals a fixed sex effect and a covariable weight at the beginning or at the end of the test period . Heritabilities of ADG1 ABT FCR ADG2 DP ECLC and MQI were respectively 0.30 0.64 0.22 0.52 0.39 0.60 0.33 in the LW and 0.34 0.56 0.25 0.46 0.31 0.68 0.23 in the LR breed. Common litter effects ranged from 5 ABT in LW breed to 16 ADG2 in LR breed of phenotypic variance. Growth traits and FCR exhibited favourable genetic correlations but were unfavourably correlated to DP and carcass lean content. MQI also showed .