Effects of cytoplasmic inheritance on preweaning traits of Hereford cattle

Genetics and Molecular Biology

Carlos Alberto Mezzadra¹  Lilia Magdalena Melucci²  Pablo Marcelo Corva²  Sebastián López Valiente²  María Verónica Rípoli¹  Pedro Lirón¹  Guillermo Giovambattista¹ 

[1] ,Universidad Nacional de Mar del Plata Facultad de Ciencias Agrarias Departamento de Producción AnimalBalcarce,Argentina

关键词: beef cattle;    Hereford;    birth weight;    weaning weight;    cytoplasmic inheritance;    SSCP;   

DOI  :  10.1590/S1415-47572005000300003

来源: SciELO

【 摘 要 】

The influence of cytoplasmic inheritance on birth and weaning weight was evaluated in an experimental Hereford herd. Data on 1,720 records for birth and weaning weights from calves born between 1963 and 2002 were studied. Variance components were estimated using MTDFREML procedures and an animal model was fitted for each trait. Direct and maternal additive effects and permanent environment and maternal lineage effects were treated as random, while year and month of birth, age of dam and sex of the calf were treated as fixed. Identification of maternal lineages was based on pedigree information. The contribution to phenotypic variance of cytoplasmic lineages defined by pedigree information was negligible for both traits. Mitochondrial genotypes of cows present in the herd in 2002 were analyzed by single strand conformation polymorphism (SSCP) analysis. Only five different genotypes were identified among 23 maternal lineages. All the animals with records were assigned to maternal genotypes based on pedigree information. The statistical analysis was repeated, removing maternal lineage from the model and including mitochondrial genotype as a fixed effect. No evidence of genotype effects was detected. These results suggest a negligible effect of the mitochondrial genome on the preweaning traits of this Hereford herd.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License