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The body conformation of dairy cattle is closely related to their life-time production. Because of this fact, the development of an accurate and simple method of body dimension measurement using computer image analysis is the objective of this study. A rectangular pipe frame was used as a dimension measurement standard for obtaining photographs. It was placed vertically on flat ground and parallel to the planes which were made by the median line and the points of the pin bone. Two images were photographed: the side view and the dorsal view of an object. The measurements were taken on a wooden cattle model of 1/10 scale and three heads of Holstein cattle. Errors of the ten sites of body dimension measurement points, compared with direct measurements, were the range of -1.9-2.4% with an average absolute error of 0.8% in the wood model and -3.5-3.5% with an average absolute error of 1.2% in the live animals. This method was more accurate and simpler than the conventional method of direct measurement of live animals

Development of a Body Dimension Measurement Method for Dairy Cattle by Computer Image Analysis with Video Camera