Effects of hemiacetal of chloral and starch on the performance of beef steers

Cole, N.A.; McCroskey, J.E.

Journal of Animal Science 41(6): 1735-1741


ISSN/ISBN: 0021-8812
DOI: 10.2527/jas1975.4161735x
Accession: 000361278

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Metabolism and feeding trials were made to assess the value of the hemiacetal of chloral and starch (HCS) as an inhibitor of methane production. The control diet contained 63% rolled sorghum, with dried lucerne, cottonseed hulls, soya bean oil-meal, molasses, minerals and chlortetracycline. Twelve Hereford and Angus bullocks of mean weight 262 kg were paired and split between 2 treatments, control or control + 0.3% HCS. After 30 days and again after 120 days, faeces and urine were collected for 7 days followed by 2 days in respiration chambers. DM intakes were about 1.5% of liveweight. Gross energy (GE) intakes were similar for the 2 treatments, averaging 285 and 264 kcal/kg0.75 in the 2 collection periods. In the first period, gaseous energy losses were 23% less for the HCS group. Methane production in the groups was significantly different, but when energy lost as H2 in the HCS group was added, the difference in gaseous energy losses was not significant. The trend towards lower gaseous energy losses on HCS was partly counteracted by reduced digestibility. The 0.3% HCS level may have been too high. In the second collection period, gaseous losses were 16% lower on HCS, but the differences were not significant. There was some adaptation to 0.3% HCS between the 2 periods. In a further trial 27 crossbred bullocks of average weight 316 kg were divided, after 2 weeks of adaptation, between 3 treatments for an 84-day finishing period. Treatment 1 was the control diet as before. Treatment 2 was the control with 0.2% HCS. Treatment 3 was control with 0.1% HCS for 28 days followed by 0.2% for 28 days and 0.3% thereafter. Average daily gains were 1.40, 1.35 and 1.10 kg, respectively. Feed DM intakes were 10.85, 9.86 and 9.54 kg/day and GE/gain ratios were 35.07, 33.15 and 39.36 Mcal/kg. None of the differences was significant. Over succeeding 28-day periods on treatment 3 intake decreased with 0.3% HCS. Addition of HCS in the amounts used showed no advantage.