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Diurnal Variation in the Estimates of Digestibility of Pasture Forage Using Plant Chromogens and Fecal-Nitrogen as Indicators^{1, 2,}

State College of Washington

Abstract

Conclusions: The results of this study show that when the digestibility of the dry matter of forages consumed by grazing sheep and cattle is determined by the use of formulae developed by Reid et al. (1952) for chromogen, and by Lancaster (1949) for nitrogen, there is no diurnal variation in the estimates of digestibility.

Moreover, the fecal-nitrogen method appears to give as good an indication of dry matter digestibility as the chromogen method.

¹ Scientific Paper No. 1276. Washington Agricultural Experiment Stations, Pullman. Project 1140.

² The assistance of Dr. Wendell E. Ham of the Department of Animal Husbandry is gratefully acknowledged.

³ Point Four Trainee from Tezpur, Assam, India.