High-Oil, High-Protein Diets and Milk Secretion by Cows

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Abstract
Intakes of grass silage, and yield and composition of milk were examined in cows given high protein diets to which 2 quantities of soybean oil had been added as intracellular or extracellular inclusions. Adding extra protein to the diet did not prevent reduction of dry matter intakes of forage when soybean oil was added to the diet of cows. There was a fundamental difference in the mechanism by which high starch diets reduced intake of forage dry matter from that of high oil diets. In diets containing extracellular unsaturated oils, concentration of oil in the total ration, not the amount of oil per se, was the primary determinant reducing milk fat percentage.