Abstract
This chapter examines the metabolic development in the neonatal rumen epithelium. The physical changes occurring during rumen epithelial development are extensively characterized. Both ontogenic and physiological/dietary factors are necessary for complete rumen epithelial metabolic development. The rumen fermentation itself, or on physical changes manifested by changes in rumen epithelial morphology and blood chemistry in the growing ruminant are focused. Changes in the expression of specific genes, such as those for ketone body production, in response to ontogenic and physiological/dietary factors appear to be responsible for the changes in energy metabolism in developing rumen epithelium. The eight-week period following birth, the time period in which the bulk of the physical and metabolic changes occur in the developing rumen epithelium is described in the chapter. The role of ontogeny in rumen epithelial metabolic development is only recognized for the importance it plays in this process. The mechanisms regulating gene expression within the developing rumen epithelium to obtain a better understanding of this process is required.
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