Direct- and maternal heritabilities were estimated for weight traits in Brangus cattle using random regression models. After editing, 54 924 records, from birth- (BW) to mature weight (MW) from 21 673 animals were selected for analysis. The data, which covered a…
The objectives of the study were to estimate genetic parameters for tick resistance and to evaluate the effect of the level of tick infestation on the estimates of genetic parameters for South African Bonsmara cattle. Field data of repeated tick…
For the estimation of additive and error variances and resulting heritability estimates 9 050 first and 5 541 second lactation records were used. Analyses were conducted using DFREML procedures. The heritabilities for first (and second) lactation for milk, fat and…
Data of 5342 progeny from 232 sires from 30 genetically linked flocks, collected through the National Progeny Testing program for Merino sheep from 1991 to 1996, were used to estimate heritabilities for several production and type traits. The traits analysed…
Data obtained from the INTERGIS for Jersey breeders participating in the NationalDairy Cattle Performance and Progeny Testing Scheme were analysed. The registered and grade records commenced in test year 1977 through 1992 (incomplete) and consisting of lactations between 240 and…
