Monensin and Tylosin in a High Energy Diet for Finishing Steers

Rumen Metabolism and Feedlot Responses by Steers Fed Tylosin and Monensin

“…Lower gains associated with reduced intakes were also observed by Pendlum et al (1978) in steers fed tylosin. There were no complementary effects of feeding monensin and tylosin on feedlot performance, in accord with data presented by Heinemann et al (1978).…”

“…However, feeding monensin has been associated with an increased incidence of liver abscesses in some cases (Horton et al 1981;Perry et al 1916) but not in others (Gates et al 1977Heinemann et al 1978 Johnson et al L9'79). Furthermore, there does not seem to be a consistent relationship between the presence ofabscessed livers and either feedlot performance or carcass characteristics.…”

Growth promoters and meat yield

“…This variability in response between finishing and grazing cattle may be explained by two different feed intake mechanisms. Other reports gave conflicting results for carcass fatness (73,74). In grazing cattle, gut fill or rumen distention may be the limiting factor, because the intracellular water of the grass may contribute to the bulk of the food (67).…”

Effect of Monensin and Tylosin on Average Daily Gain, Feed Efficiency and Liver Abscess Incidence in Feedlot Cattle

“…The effects of feeding monensin and tylosin in combination on the performance of finishing cattle have been previously reported from two individual trials with divergent results (Heinemann et al, 1978;Pendlum et al, 1978). Pendlum et al (1978) indicated that monensin decreased feed intake and improved feed efficiency with essentially no effect on daily gains, while tylosin decreased gains and intake and produced less efficient feed conversions in steers fed a corn silage-ground wheat diet for 140 d. Tylosin reduced the incidence of liver abscesses from 14.6 to 6.3%.…”

“…Pendlum et al (1978) indicated that monensin decreased feed intake and improved feed efficiency with essentially no effect on daily gains, while tylosin decreased gains and intake and produced less efficient feed conversions in steers fed a corn silage-ground wheat diet for 140 d. Tylosin reduced the incidence of liver abscesses from 14.6 to 6.3%. Heinemann et al (1978) fed steers a 67% concentrate diet for 127 d. Monensin at 33 ppm caused a reduction in rate of gain as compared with gains of cattle fed 0, 5.5 or 11 ppm. Feed intake was reduced and feed conversion was improved by monensin feeding.…”