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Phytate Phosphorus Intake and Disappearance in the Gastrointestinal Tract of High Producing Dairy Cows¹

Cook College, Rutgers — The State University, New Brunswick, NJ 08903

ABSTRACT

Thirty Holstein cows were fed diets of 50% grain and 50% corn silage (dry matter basis) through the first 18 wk of lactation. Grain mixes were supplemented with inorganic calcium sources (aragonite, calcite flour, or albacar) to provide .6 or .9% dietary calcium (dry matter basis). Phytate phosphorus intake averaged 38.3 and 42.6 g/d in digestion trials conducted during wk 4 and 10 of lactation, respectively. Even though large quantities of feed and significant amounts of grain were consumed, 98% of dietary phytate phosphorus was hydrolyzed to inorganic phosphorus. Neither calcium source nor calcium quantity affected the hydrolysis of phytate phosphorus.

¹ New Nersey Agricultural Experiment Station, Publication Number D-06901-2-86 supported by state, US Department of Agriculture Animal Health, and Harold Wetterberg Foundation funds. Material and financial support was also received from Limestone Products Corporation, Sparta, NJ.

² Department of Animal Sciences.

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