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Effect of Dietary Calcium on Selenium Absorption by the Nonlactating Dairy Cow^1,2,3,

Department of Dairy Science, Ohio Agricultural Research and Development Center, Wooster 44691

ABSTRACT

Eleven nonlactating Holstein cows in late gestation were used to study the effect of dietary calcium concentration on apparent selenium absorption. Digestion trials with total collection helped to estimate apparent absorption of specific nutrients. Mean daily selenium intake ranged from 900 to 1700 µg per day. Regression analysis indicated apparent selenium absorption was maximum when dietary calcium was .8% of dry matter intake. Amounts of dietary calcium less or greater than .8% of dry matter intake reduced apparent selenium absorption. Dietary calcium quantitatively affected apparent selenium absorption in amounts of nutritional significance when selenium was provided from natural feedstuffs.

¹ Salaries and research support provided by State and Federal Funds appropriated to Ohio Agricultural Research and Development Center. Journal Article No. 127-83.

² This research supported by USDA Grant P. L. 89-106.

³ Some data were included in a previous publication (3).