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Calcium and Phosphorus Assimilation by Dairy Cows

Vermont Agricultural Experiment Station

Abstract

Extensive calcium and phosphorus balance trials with milking cows were started by the writers at this Station over seven years ago. Results from numerous short time trials during the first four years showed that heavily milking cows were frequently in positive balance and indicated assimilation of mineral supplements—steamed bone meal and ground limestone. A study of these results led to the belief that continuous balances by short periods through complete lactations were necessary to show when and to what extent milking cows lose and store minerals, whether they normally pass through an extended period of negative balance compensated for by an extensive storage as lactation progresses and if a liberal yield of milk normally results in a net loss of minerals from the body. Accordingly, balance trials for full lactation and gestation periods were started in December, 1928. These are believed to be the first trials of their kind ever attempted.