The Effects of Inbreeding and Crossbreeding on Guinea Pigs: Decline in Vigor, Differentiation Among Inbred Families (Classic Reprint) - Softcover

Wright, Sewall

Softcover

ISBN 10: 1528517024 ISBN 13: 9781528517027

Verlag: Forgotten Books, 2017

Inhaltsangabe

Excerpt from The Effects of Inbreeding and Crossbreeding on Guinea Pigs: Decline in Vigor, Differentiation Among Inbred Families

All 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.

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Details zur Ausgabe

• Verlag: Forgotten Books
• Erscheinungsdatum: 2017
• Sprache: Englisch
• ISBN 10: 1528517024
• ISBN 13: 9781528517027
• Einband: Taschenbuch
• Anzahl der Seiten: 74
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