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Birth weight (BW), 205-d weaning weight (WW) and total preweaning gain (GAIN) data were evaluated for evidence of cytoplasmic genetic effects in calves from three synthetic lines of beef cattle differing in mature size. Bulls of Jersey, Angus and Sinunental breed combinations were used to generate small (S), medium (M) and large (L) size lines represented in each of two research herds (Rhodes and McNay). Analyses involved records collected on 2543 calves at Rhodes and 1281 calves at McNay from 1978 to 1987. Pedigree information tracing back to the initiation of the project was used to assign calves to cytoplasmic lineages. Numbers of cytoplasmic lineages represented by size group were 69 (S), 67 (M) and 56 (L) at Rhodes and 61 (S), 47 (M) and 19 (L) at McNay. Data were analyzed separately by herd and size line using two mathematical models. Model I included fixed effects of calf birth year, sex of calf and age of dam along with the random effects of sires, cytoplasmic lineages and residual error. Model II differed only by the inclusion of random cows within cytoplasmic lineage effects. For Model I, effects of cytoplasmic lineage were significant (P<.01) for all traits and size lines at Rhodes. At McNay cytoplasmic

Effects of cytoplasmic and nuclear inheritance on preweaning growth traits in three size lines of beef cattle