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Effects of Hemiacetal of Chloral and Starch on the Performance of Beef Steers^{1, 2,}

Oklahoma Agricultural Experiment Station, Stillwater 74074

Abstract

Two metabolism trials and one feedlot trial were conducted to determine the effect of Hemiacetal of chloral and starch (HCS) on methane production, energy utilization and feedlot performance of steers fed an 80% concentrate ration. Twelve steers were used in the two metabolism trials to determine the effect of HCS (.30% of ration) on methane production, and energy utilization by beef steers after 30 and 120 days on feed. In the feedlot trial, the influence of HCS at a constant level (.2%) (CHCS) and at an increasing level (.1, .2 and .3%) (IHCS) in the ration on feedlot performance was investigated using 27 beef steers. At 30 days on feed, steers fed HCS had lower (P<.05) energy digestibilities (DE) and metabolizable energy (ME) values and tended to have lower net energy (NE_m+g) and energy retentions (ER) despite a significant reduction in methane production. After 120 days on feed, the HCS steers had apparently adapted to the high level of HCS. DE, NE_m+g and ER values were similar for both groups at 120 days on feed although the HCS ration tended to have higher ME values. In the feedlot, average daily gains (ADG) were 1.40, 1.35 and 1.10 kg for the control, CHCS and IHCS groups, respectively. When compared to controls, the CHCS ration had a 6% improvement in feed efficiency but a 9% decrease in feed intake.

¹ Journal article 2962 of the Agricultural Experiment Station, Oklahoma State University, Stillwater. This research was conducted by the Department of Animal Sciences and Industry in cooperation with the U.S.D.A., Agricultural Research Service, Southern Region.

² The authors wish to express their appreciation to Smith Kline Animal Health Products for providing the methane inhibitor.

³ Present address: Department of Animal Industries, University Idaho, Moscow 83843.

⁴ Present address: Department of Animal Science, Texas Technological University, Lubbock 79409.