Records for birth weight (BW), 180-day weaning weight (WW), pre- and post-weaning ADG of young beef bulls in Hereford (HE), Beef Synthetic #1 (SY1), Dairy Synthetic (SD) and Double Muscled (DM) breed groups from 1970 to 1988 were used to estimate variance components and genetic parameters by derivative-free restricted maximum likelihood (DFREML) procedure using an univariate animal model with maternal effects. Heritability estimates for direct effects for BW and post-weaning ADG in all breed groups were consistently higher than heritability estimates for maternal effects, however, the pattern was reversed for WW and pre-weaning ADG. The heritability estimates were different among the breed groups. Heritability estimates for direct effects were moderate for BW (0.16-0.26) in DM and SD, and high in HE and SY1 (0.65-0.71), low for WW (0.07-0.15) and pre-weaning ADG (0.07-0.25), moderate for post-weaning ADG (0.270.39), except for HE (0.61). Heritability estimates for maternal effects were moderate for BW (0.17-0.36), low for post-weaning ADG (0.05-0.15) except for HE (0.59), moderate to high for WW (0.29-0.76), high for pre-weaning ADG (0.49-0.7) except for DM (0.09). The estimates of total heritability were high for BW (0.45-0.69) except for DM (0.04), low for WW (0.01-0.1) except for SY1 (0.32), moderate for pre-weaning ADG (0.18-0.35) except for DM (0.07), low for post- weaning ADG (0.07-0.15). The estimates of total heritability for all traits in DM were lower than other breed groups (0.01 -0.07). The genetic correlation between direct and maternal effects were negative for all traits in the four breed groups, except for BW in SD and WW in SY1, indicating that it is important to utilize maternal genetic variation in a selection program for growth traits
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 17. Genetics and breeding of dairy and beef cattle, swine and horses, , 229–232, 1994
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