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Effect of Ration, Waste Composition and Length of Storage on the Volatilization of Ammonia, Hydrogen Sulfide and Odors from Cattle Waste^1,2,

Oregon State University, Corvallis 97331

Abstract

Several variables associated with the composition and management of bovine waste and various grains (corn, milo, barley) and their level of supplementation (25%, 50%, 75%) in rations were evaluated to determine their effect on initial volatilization of ammonia (NH₃), amines, hydrogen sulfide (H₂S), and odori-ferious compounds

Dry matter (DM) and crude protein (CP) content of feces were not correlated (P>.10) with initial NH₃ volatilization. Urea content and specific gravity of urine were positively correlated (P<.10) with the NH₃ initial evolution rate. The grain source altered the pH of waste (P<.05) with milo producing the lowest pH and barley the highest. NH₃ volatilization showed a positive correlation (P<.05) with pH of waste.

Urea from urine was the primary precursor of the initial NH₃ volatilized with maximum release of NH₃ occurring between the second and fifth day of storage. Volatile amines accounted for approximately .11% of the total nitrogen volatilized and were positively correlated (P<.01) with NH₃ evolution.

Addition of sagebrush at 1% and 1.5% levels showed no modification (P>.10) of olfactory evaluation of the waste. Peppermint oil at the .25% level in the diet reduced (P<.05) the relative offensiveness associated with the waste.

¹ Technical Paper No. 4720, Oregon Agricultural Experiment Station.

² Partial financial support was provided by Grant No. 5802009, Office of Research and Development, U. S. Environmental Protection Agency.

³ Department of Animal Science, Oregon State University, Corvallis 97331.

⁴ Dept. of Agricultural Engineering, Oregon State University, Corvallis 97331.

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