Journal article

Effects of circulating progesterone and insulin on early embryo development in beef heifers

GE Mann, MP Green, KD Sinclair, KJ Demmers, MD Fray, CG Gutierrez, PC Garnsworthy, R Webb

ANIMAL REPRODUCTION SCIENCE | ELSEVIER SCIENCE BV | Published : 2003

Abstract

The aims of this study were to determine the effect on early embryo development of feeding a diet formulated to enhance circulating insulin concentrations and secondly to investigate the association between early embryo development and maternal progesterone concentrations in beef heifers. The study was carried out in 32 Simmental x Holstein Friesian heifers 22-25 months of age weighing 506+/-7kg and in condition score 3.1+/-0.1. Animals were fed two diets that were isoenergetic and isonitrogenous, but that would encourage either propionate (diet A) or acetate (diet B) production in the rumen. The rationale was that propionate would induce a greater insulin release in response to feeding. Ani..

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University of Melbourne Researchers