@article{muller_botha_2003, title={The response to selection during first lactation on the phenotypic and genetic trends in the Elsenburg Holstein-Friesland herd}, volume={33}, DOI={10.4314/sajas.v33i2.3764}, publisher={African Journals Online (AJOL)}, author={Muller and Botha}, year={2003}, month={Feb} }