Abstract
Infusion of chemicals or gases into the mammary glands of dairy cattle has been used to alter the appearance of udders in cattle used in exhibitions. People who fit dairy cattle to enhance the gross appearance of the udder by making it appear larger and fuller have used these agents. The ethical issues surrounding this practice are controversial and the purebred dairy cattle show industry is considering methods to detect these practices. In the past, studies using thermography and ultrasonography were inconclusive in determining if agents placed in the udder could be detected.1,2 The purposes of this study were to determine the ultrasonographic appearance of exogenous isobutane gas infused into the udder. And to determine the effects of volume and pressure used to infuse exogenous isobutane gas and exogenous isobutane gas on duration of ultrasonographic appearance in the udder.
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