Studies in Milk Secretion, Vol. 17: Relation Between Milk Yields and Butter-Fat Percentages of the 7-Day and 365-Day Tests of Holstein-Friesian Advanced Registry Cattle (Classic Reprint) - Softcover

Inhaltsangabe

Excerpt from Studies in Milk Secretion, Vol. 17: Relation Between Milk Yields and Butter-Fat Percentages of the 7-Day and 365-Day Tests of Holstein-Friesian Advanced Registry Cattle

During the course Of their development two of our leading dairy breeds, the Jersey and. The holstein-friesian, have made extensive use Of the 7-day test. The Jersey breed has now prac tically discontinued the use Of the 7-day record advocating the 365-day record as the only measure Of the cow's worth as a milk producer. The discussion of the merits of the Short time test and the long time test has recently entered a highly controversial stage even among its chief adherents, the holstein-friesian breeders. Few, if any, Of the supporters Of either camp have actively asserted that the long time test was not desirable. The contest has centered on the validity. Of the 7-day test as a meas ure Of the cow's subsequent performance.

This question is intricate. It is really one phase of the larger question of the normal fluctuating variability of milk yield. In fact, it is from this angle that the authors were led into this problem, for whatever Significance may be attached to this variability, a fairly comprehensive knowledge of its magni tude forms a necessary prelude to the further use Of such data for genetic studies.

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