The concentrations of blood metabolites and the relations between blood parameters, fatty acid composition of milk and estimated ME-balance in dairy cows given grass silage ad libitum with five different carbohydrate supplements.
1989
Miettinen H. | Huhtanen P.
The effects of the carbohydrate composition of the concentrate supplements on certain blood metabolites and the relations between blood metabolites, fatty acid composition of milk and estimated ME-balance were studied in 5 dairy cows given grass silage ad libitum in the 5x5 Latin Square design. Substituting barley with unmolassed sugar beet pulp decreased the aveage plasma concentration of insulin and the postprandial insulin peak, increased the plasma non-esterified fatty acid (NEFA) concentration and tended to decrease the concentrations of blood beta-hydroxybutyrate and plasma urea. Dietary inclusion of molasses had no significant effect on the blood metabolites measured. Blood acetoacetate, and plasma NEFA and glucose concentrations were the best indicators of the cow's energy status, based on the close correlation of these metabolites and estimated energy balance. The proportions of milk fatty acids synthetized de novo (C6-C16) were positively correlated and the long chain fatty acids derived entirely from the blood (greater than C16) were negatively correlated with the estimated ME-balance.
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