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Relation of Forage Nutrient Digestibilities to Varied Hay-Grain Ratios

Animal Husbandry Research Division, ARS, Agricultural Research Center, Beltsville, Maryland

Abstract

Seventeen individual cow digestion trials were carried out, to study the effect of varied hay-grain intakes on forage component digestibilities. Estimated net energy intake was kept relatively constant. The plan of the experiment involved a Latin square. The approximate levels of grain fed in the rations were: 7, 16 and 36%, on a dry matter basis.

While significant increases in ration component digestibilities were observed, no effect associated with hay-grain ratios was established, since the forage component digestibilities (ration corrected for grain) showed no significant differences for grain levels.

The calculation of forage component digestibilities in mixed hay-grain rations can be performed satisfactorily either by correction of fecal component quantities for the amounts of indigestible material in the grain fed or by regression of component digestibilities on the amounts of grain fed.

Regression of ration component digestibilities on amounts of grain fed (1–5 lb. daily) are shown.

A modification of the Christian-Coup chromium oxide method is provided, whereby the originally imposed limit of chromium oxide content in sample can be raised from 15 to 30 mg. without loss of accuracy.

¹ The authors gratefully acknowledge the technical assistance of O. M. Bowman and P. M. Damewood, Jr.

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