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Effects of Solids and Liquid Flows on Fermentation in Continuous Cultures. II. Nitrogen Partition and Efficiency of Microbial Synthesis^1,2,

University of Maine^,4, Orono 04473

Abstract

The effects of varying solids retention time (SRT) and liquid dilution rate (D) on N partition and microbial efficiency were studied in vitro with a dual flow continuous culture system. SRT's of 14.3, 22.0 and 29.7 hr and D's of .07, .11 and .15 volumes/hr were used. Ammonia N accounted for 2.69 to 7.30% of total effluent N. Highest values were observed with 29.7-hr SRT at .11 and .15/hr D's, and were associated with a slight decrease in microbial N. Between 1.17 and 2.50 g microbial N were produced per 24 hr, accounting for 31.34 to 50.49% of total effluent N. Daily output of microbial N increased (P<.05) with increasing D at the lowest SRT but showed little or no change at the 22.0-and 29.7-hr SRT's. Feed bypass N was inversely related to microbial N and accounted for 44.91 to 65.10% of total effluent N. Microbial cell yields per mole ATP (Y_ATP) ranged from 10.40 to 24.41 and tended to increase with decreased SRT more than with increased D, although responses were variable. Efficiency of microbial N synthesis ranged from 15.75 to 23.91 g microbial N/kg digested dry matter (DDM), with trends similar to those seen for Y_ATP.

¹ Supported in part by Agway, Inc., Syracuse, NY.

² The authors gratefully thank Dr. M. R. Stokes for assisting in the review and evaluation of these data.

³ Present address: Dept. of Anim. and Vet. Sci., West Virginia Univ., Morgantown 26506.

⁴ Dept. of Anim. and Vet. Sci.

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