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Spontaneous and Induced Lipolysis in Milk During Alternate Feeding of Two Winter Rations and of a Winter Ration and Pasture

Department of Animal Industries, Storrs Agricultural Experiment Station, Storrs, Connecticut

ABSTRACT

The milk from ten Holsteins was analyzed for initial acid degree value (ADV), spontaneous lipolysis, and induced lipolysis during a 3-mo. switch-back feeding trial involving two winter rations and a 10-wk. cross-over feeding trial involving a winter ration and pasture. Samples were obtained once a week from each cow. ADVs were determined by the silica-gel method. The different feeding regimes had no significant comparative influence on the incidence of induced lipolysis or the initial ADV. There was no significant difference in the incidence of spontaneous lipolysis between the two winter rations (grain, corn silage, and alfalfa hay versus grain, corn silage, and beet pulp). The feeding of pasture, beet pulp, and grain significantly reduced the occurrence of spontaneous lipolysis over that observed for alfalfa hay, beet pulp, and grain.