The Effects of Inbreeding and Crossbreeding on Guinea Pigs

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Excerpt from The Effects of Inbreeding and Crossbreeding on Guinea Pigs: Decline in Vigor, Differentiation Among Inbred FamiliesAll litters are recorded on the day on which they are born, except that litters born on Sunday or a holiday are recorded on the next day. At birth the date, pen, number, sex, color, and weight are recorded for each young one. Drawings are made of the coat pattern of each guinea pig in a rubber-stamp outline. The variety of the colors, including intense and dilute agouti, black with red, yellow, or cream spotting, and albinism, together with the almost endless variety in the tricolor pattern, make color and pattern an almost certain means for the identification of individuals. Ear punches are also used as a help to identification. All mated animals are identified at death to insure that no confusion has occurred in the matings. Each of the young is weighed at the ages of 3, 13, 23, and 33 days as well as at birth. Up to 1916 the mated animals were weighed when 1 year old. Since 1917 more frequent weighings have been made.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology 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.