The Collection and Freezing of Semen from an Impotent Bull.

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@article{Macpherson1963TheCA, title={The Collection and Freezing of Semen from an Impotent Bull.}, author={Jim Macpherson and G F Cevallos}, journal={The Canadian veterinary journal = La revue vétérinaire canadienne}, year={1963}, volume={4 9}, pages={242-4} }