J. Anim Sci.
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J. Anim Sci. 1978. 47:577-583.
© 1978 American Society of Animal Science
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Evaluation of Clarifier Sludge as a Feed for Ruminants1,2,

R. B. Fifield3 and R. J. Johnson4

Washington State University,5, Pullman 99164

Abstract

Growth and metabolism experiments were conducted with yearling Hereford and Hereford x Angus steers to determine the feeding, nutrient digestibility, digestible energy (DE), and metabolizable energy (ME) values of clarifier sludge, a wood pulping by-product. In a growing and finishing experiment, 90 steers were fed sludge at levels varying from 55 to 75% of the total ration dry matter for 168 days (growing) and then fed an 85% barley ration for 92 days (finishing). The average daily gain for all steers was .74 kg and 1.71 kg for the respective growing and finishing periods. All measured carcass characteristics were found to be similar.

The feeding values of sludge at 50% and 31% dry matter (DM) were compared in another growing and finishing experiment. The 31% DM sludge and 50% DM sludge were fed to 10 steers (five on each ration) for an 84-day growing period. Average daily gain for the 31% DM-fed steers was 1.14 kg and for the 50% DM-fed steers .95 kilograms. These steers were then finished on an 85% barley ration for 56 days and exhibited no pretreatment effects on average daily gains (1.44 kg).

Total digestible nutrients (TDN), DE and ME were determined for the 31% DM sludge in a metabolic experiment. The mean values for TDN, DE and ME were 65.9%, 2.90 kcal/g and 2.59 kcal/g, respectively, for clarifier sludge fed to 379-kg steers at maintenance.

Footnotes

1 Scientific Paper No. 47971. College of Agriculture Research Center, Washington State University. Project 0302.

2 Clarifier sludge was supplied by ITT Rayonier, Port Angeles, WA.

3 Present address: The Peavey Co., FarWest Region, Bozeman, MT 59715.

4 Present address: Southeast Kansas Experiment Station, Mound Valley, KS 67354.

5 Department of Animal Sciences.






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