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Published online by Cambridge University Press: 11 January 2023
Over the last 30 or so years the selection pressures put upon farm livestock have been such that we now have a number of vastly ‘improved’ animals - improved in the sense that they have changed in size and shape, grow faster, produce more and are more economical to keep. The speed at which these changes have been brought about has increased as techniques such as artificial insemination and embryo transfer have been developed and used.