Excerpt from Essentials of Animal Breeding When an egg matures in the ovary it passes down the Fallopian tubes into the uterus. If sperm is introduced, the egg is thrown off infertile. In female animals an egg matures at fairly regular intervals, and this corresponds with some exactness to what is kwn as the period of heat or oestrum. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art techlogy to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.