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Adaptational Responses in Nitrogen and Energy Balance of Lambs Fed a Methane Inhibitor¹

University of Illinois at Urbana-Champaign^,3, Urbana 61801

Abstract

Total nitrogen and energy balances of six lambs when fed two levels of intake of a 90% concentrate control diet and after 3 and 30 days of dosage with a hemiacetal of chloral and starch resulted in reduced gas energy losses (P<.01) to 49% of controls on day 3 and to 89% on day 30. Energy digestibility was increased (P<.05) above controls only when measured at day 30. Diet energy metabolizability was increased (P<.01) by an average of 3.5% above the control, resulting in a significant (P<.01) increase in energy retention. Metabolizable energy from the inhibitor diet was utilized at least as efficiently as that from the control. Nitrogen retentions tended to be higher at day 3 and were markedly higher (P<.05) at day 30 of inhibitor dosage but were retained in an approximately constant ratio to that of energy.

¹ Supported in part by a grant from Smith Kline and French Lab., Philadelphia, Pa.

² Present address: Colorado State University, Metabolic Lab., Ft. Collins 80521.

³ Department of Animal Science.