A Preliminary Report on Plasma Insulin Concentrations on Japanese Shorthorn and Japanese Black Cattle from Birth to 8 Weeks of Age

概要

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TRENKLE1) described in the review that basal plasma insulin levels were 15-50μU/ml in cattle. YOUNG et al.2) found no significant relationship between insulin level and age. IRVIN and TRENKLE3) reported that plasma insulin levels could not be related to age or breed in cattle from 18 to 371 days of age. At 371 days, steers had higher levels of plasma insulin than heifers. These increased levels in the steers were reasonably related to the consumption of finishing rations rather than age or sex.At present, however, no report is available about plasma insulin levels of Japanese Shorthorn and Japanese Black Cattle. The purpose of this study was not obtain basic data of plasma insulin concentrations in calves of Japanese Shorthorn and Japanese Black Cattle and to see whether the results obtained in other breeds can be held in these Japanese breeds or not. In this study, young sucking calves which were not fed with rations were used to investigate the breed difference of plasma insulin levels, as it was known that insulin levels of adult calves were influenced by feeding rations3).