Dairy nutritionists historically balanced milk cow rations for phosphorus at .45 to .5 % DM of the total ration. New studies have shown a high producing milk cow only requires a diet at .38% DM. Thirty-seven farms were studied to determine and compare P feeding levels in Oregon. The results of the project were then incorporated into educational programs. The average farm studied was over feeding by 18%. Eighty-nine percent of producers surveyed indicated this project increased their understanding of the problem we face as an industry. Approximately 50% of producers participating reduced P feeding on their farm.

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