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Relationships Among Udder Height, Age, and Milk Production¹

Department of Animal Science, North Carolina State College, Raleigh

ABSTRACT

Low and pendulous udders are of considerable economic importance to the dairyman, since they are more susceptible to injuries and more difficult to milk. These factors have led breeders to discriminate against pendulous udders. A significant correlation (–0.14) between udder height and clinical mastitis, after adjustment for age, also was found in a study (2) of a portion of the data used in this investigation.

The purpose of this investigation was to evaluate the relationships among age, milk yield, and two measures of udder height. One measure was the distance from the barn floor to the lowest point of the udder floor. The other measure was the distance from the barn floor to the lowest point of the udder floor, minus the distance from the barn floor to the point of the hock. Hock height was used in this second measure, since it is often used by breeders as a reference point when evaluating udder height.

¹ Published with the approval of the Director of Research as a Technical Note.