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Excerpt from Rate of Milk Secretion as Affected by Advance in Lactation and Gestation: Correction of Yield, Within a Lactation Period, for Length of Record and for Pregnancy The relation between the 7-day and 365-day records of the Holstein breed has been studied by Yapp3 and by Gowen and Gowen.4 Yapp considered all ages together and found the correlation between the milk records for the two periods within the same lactation to be r 702 d: 01. Gowen and Gowen find this coefficient reduced to about 6 when confined to narrow age limits. The latter authors have derived a complete series of prediction equations or correction formulae to express, for various ages, the quantitative relations between the two records. These formulae are based on a linear equation, y a bx, where y is the yield to be expected from the record, as, which is known. We are concerned in this study more particularly with records of varying length in the same lactation, say from 200 to 365 days, during which the calf is carried varying lengths of time. Of particular interest is the relation between the 305-day and 365-day records, since these periods constitute a common basis of distinction in the official testing of several of our dairy breeds. 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 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.

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