
TY  - JOUR
A1  - Meyer, K 
A1  - Graser, HU 
T1  - Scope for genetic evaluation and selection of beef cattle for growth to weaning when birth dates are not recorded
JF  - Australian Journal of Agricultural Research
JO  - Aust. J.  Agric. Res.
Y1  - 1994
VL  - 45
IS  - 4
SP  - 819
EP  - 827
KW  - growth;genetic evaluation;beef cattle
UR  - https://doi.org/10.1071/AR9940819 
N2  - Estimates of (co)variance components and genetic parameters were obtained for a preweaning weight, recorded between 2 and 5 months after birth, and the subsequent gain till weaning for two herds in a selection experiment in Western Australia. Analyses were carried out both accounting for age at weighing and assuming birth dates and thus ages were unknown. On adjusting for the interval between weighings, preweaning gain appeared to be independent of age and equally heritable to weaning weight. Estimates of the direct genetic correlation between preweaning gain and weaning weight (adjusted for age) were 0.9 or higher, while both genetic and permanent environmental maternal correlations were close to unity. Implications for the use of preweaning weight as an alternative selection criterion to weaning weight when birth dates are not recorded are discussed. 
ER  -

