The role of endocrine insulin-like growth factor-I (IGF-I) in female bovine reproduction

Velazquez, M A and Spicer, L J and Wathes, D C (2008) The role of endocrine insulin-like growth factor-I (IGF-I) in female bovine reproduction. DOMESTIC ANIMAL ENDOCRINOLOGY, 35 (4). pp. 325-342.

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Abstract

Insulin-like growth factor-I (IGF-I) plays a pivotal role in cattle fertility, acting as a monitoting signal that allows reproductive events to occur when nutritional conditions for successful reproduction are reached. However, endocrine IGF-I is not a predictor of reproductive events, but rather an indirect estimator of the suitability of the animal to achieve the reproductive event in question. Although measuring circulating IGF-I concentrations might not have any clinical application in the cattle industry, endocrine IGF-I screening will continue to be important for the study of interactions between nutrition and reproduction. In addition, endocrine IGF-I screening could be used as an ancillary test for the selection of cattle for high reproductive potential, especially in herds of high genetic merit for milk production, in which a decline in fertility has been identified. (C) 2008 Elsevier Inc. All rights reserved.