Effect of dietary inclusion of medium-chain saturated fatty acids on ammonia and methane emitting potential of dairy manure

A. N. Hristov, C. Lee, T. Cassidy, M. Long, K. Heyler, E. Wheeler, P. Topper

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Two experiments with lactating dairy cows were conducted to evaluate the effect of dietary inclusion of medium-chain saturated fatty acids (lauric and myristic, Exp. 1 and coconut oil, Exp. 2) on the ammonia and methane emitting potential of dairy manure. Experiment 1 was a replicated 3 x 3 Latin square design trial with 6 cows and Experiment 2 was a completely randomized block design trial with 36 cows and also involved dietary crude protein levels as a treatment. Individual cow (Exp. 1; n = 6) or composite (Exp. 2; n = 2) fecal and urine samples were combined in a 1.7:1 (w/w; feces and urine, respectively) ratio and ammonia and methane emitting potential of manure was measured in a steady-state gas emission system. In Exp. 1, the end-point cumulative ammonia emission was greater for lauric acid than for the control. Diets had marginal effect on manure methane emissions. In Exp. 2, dietary protein level had a profound effect on ammonia emissions; the low-crude protein diet had 37% lower ammonia emissions compared with the high-crude protein diet. The end-point cumulative methane emission was drastically increased by coconut oil compared with the control. Overall, individual medium-chain saturated fatty acids fed to dairy cows had biologically insignificant effects on the ammonia and methane emitting potential of manure as measured in these experiments. A larger dose of coconut oil caused a sizable increase in cumulative methane emission from dairy manure.

Original languageEnglish (US)
Title of host publicationASABE - International Symposium on Air Quality and Waste Management for Agriculture 2010
Pages749-755
Number of pages7
StatePublished - Dec 1 2010
EventInternational Symposium on Air Quality and Waste Management for Agriculture 2010 - Dallas, TX, United States
Duration: Sep 13 2010Sep 16 2010

Publication series

NameASABE - International Symposium on Air Quality and Waste Management for Agriculture 2010

Other

OtherInternational Symposium on Air Quality and Waste Management for Agriculture 2010
CountryUnited States
CityDallas, TX
Period9/13/109/16/10

All Science Journal Classification (ASJC) codes

  • Agricultural and Biological Sciences (miscellaneous)
  • Environmental Engineering
  • Pollution
  • Waste Management and Disposal

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  • Cite this

    Hristov, A. N., Lee, C., Cassidy, T., Long, M., Heyler, K., Wheeler, E., & Topper, P. (2010). Effect of dietary inclusion of medium-chain saturated fatty acids on ammonia and methane emitting potential of dairy manure. In ASABE - International Symposium on Air Quality and Waste Management for Agriculture 2010 (pp. 749-755). (ASABE - International Symposium on Air Quality and Waste Management for Agriculture 2010).