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Acetate and Stearate Utilization by Lactating Cows Fed High Grain-Restricted Roughage Rations

Department of Dairy Science, Virginia Polytechnic Institute and State University, Blacksburg 24061

ABSTRACT

Two lactating cows were fed normal and high grain-restricted roughage (HG-RR) rations to study ration effect on the utilization of ¹⁴C-acetate and ³H-stearate. Milk, blood, and adipose and liver tissues were analyzed for lipid labeling. The HGRR ration caused increased ¹⁴C and ³H labeling of milk and adipose lipids. Triglycerides decreased in milk lipids. Labeling by both isotopes increased in cholesterol, triglyceride, and polar lipids when the HGRR ration was fed. Liver increased in polar lipid and decreased in free fatty acids. The relative incorporation of ¹⁴C-acetate and ³H-stearate into adipose tissue and milk lipid supports the view that a principle cause of decreased milk fat production is a decreased circulating acetate and stearate pool presumably due to synthetic activities and retention of fatty acids in adipose tissue.