Age as a factor in animal breeding
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The experiment furnishing the basis for this discussion was begun in 1909 by Director F.B. Mumford and has since been continued under his general direction. Swine were used in the experiment since they probably lend themselves more readily than any other type of livestock to experimental work of this nature. This investigation had for its object the determination of the effects of continued early breeding on the mother and her offspring. These effects were, of necessity, measured through variations from the normal in such characteristics as size, longevity, fecundity, prepotency and constitutional vigor.