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Plasma Glucose and Insulin Responses to Propionate in Preruminating Calves¹

University of Kentucky, Lexington 40546—0215

Abstract

Eighteen preruminating calves obtained at approximately 38 d of age were used to determine whether the ruminant insulin response to propionate is an inherent response or one that is acquired because of ruminal propionate production. A liquid milk replacer diet was fed alone or with isocaloric additions of propionate [50 mmol•(kg BW^.75)^-1•d^-1] or glucose. Both additions caused a strong insulin response, but the response by propionate-fed calves appeared to be independent of plasma glucose concentrations during the early post-feeding hours. After receiving the experimental diets for 18 d, all calves were given an iv infusion or propionate [.035 mmol propionate•(kg BW^.75)^-1•min^-1 for 20min]. All calves demonstrated a plasma insulin rise and glucose decline due to the infusions, but glucose-fed and propionate-fed calves appeared less sensitive to the iv propionate than the calves fed only milk replacer.

¹ The investigation reported in this paper (No. 81-5-152) was conducted in connection with a project of the Kentucky Agr. Exp. Sta. and is published with approval of the Director.