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Chemical Composition of Feedlot Manure¹

ABSTRACT

Manure samples were collected over a 10-mo period from a feedlot with conventional pens and pens in which about one-half the surface was covered with concrete. Samples were collected from the front, middle, and rear of each pen for each sampling period.

The average percentages of 139 samples on a dry matter basis were: dry matter, 58.5; ash, 37.0; total N, 2.32; neutral detergent fiber, 45.9; acid detergent fiber, 39.7; hemicellulose, 6.29; cellulose, 9.78; lignin, 7.67; and ADF insoluble ash, 25.3. Average pH was 7.09. The average percentages on a dry matter basis for 63 manure samples were: P, 0.54; K, 1.35; Ca, 1.88; and Na, 0.51.

Samples collected from concrete surfaces were 12.2% lower in ash because of less mising with soil. Effects of residence time of manure in the feedlot did not have a predictable effect upon composition because of the mixed influence of temperature, feedlot rations, and depth of the manure pack.

Key Words: ash • fiber • lignin • nitrogen

¹ Sponsored by the Natl. Environ. Res. Center under Grant no. R-803378-01-0.

² Professor, Research Assistants, and Associate Professor, respectively, Colorado State Univ., Fort Collins, CO 80523.

Received for publication February 28, 1977.

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