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Practical Experiments in Feeding Rations with Different Calcium Contents to Dairy Cows

U. S. Department of Agriculture

Abstract

For the last two years experiments have been in progress on the Dairy Division Experiment Farm at Beltsville, Md., to determine the practical effects of feeding rations with different calcium contents to milking cows. The cows involved may be divided into three sets. One set received timothy hay with or without corn silage as roughage, with a grain mixture having a very high protein content. Another set received alfalfa hay with or without corn silage as the roughage, with a grain mixture of a somewhat lower protein content. (It was the aim to have the same proportions of protein in the rations fed to these two sets of cows.) A third set of cows received the same ration as the first set, except that calcium carbonate was added to the grain mixture in the proportion of 3 parts calcium carbonate to 100 parts grain.

All the rations above mentioned contained a large proportion of protein, and the cows were all fed as much as they would eat without getting sick.