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Physiological Responses of Lactating Dairy Cattle to Pelleted Corn and Oats

Department of Dairy Science, Auburn University Agricultural Experiment Station, Auburn, Alabama

ABSTRACT

The physiological effects of feeding pelleted corn and oats at 19.75, 35, and 49% of the total ration of dairy cows was investigated. Molar ratios of volatile fatty acids (VFA) in rumen fluid were affected significantly by feeding rations containing 35 and 49% of pelleted corn or oats but not by rations containing 19.75% of these pelleted grains. Milk fat per cent and energy per pound of milk was depressed by 35 and 49% pelleted corn rations but not by the 19.75% pelleted corn or by any of the pelleted oat rations. The relationship between rumen VFA ratios and milk fat are discussed in the light of current knowledge.