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 (Classic Reprint) - Softcover

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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.

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