Effect of monensin, estradiol controlled release implants and supplement on performance in grazing steers.

Five trials in five locations in the United States involving 512 steers were conducted to evaluate the effect of monensin [200 mg/d in .9 kg of supplement (Ru mensin )] and estradiol-controlled release implants ( Compudose ) administered alone and in combination on average daily gain (ADG) in steers on pasture. The effect of energy supplementation on rate of gain was also evaluated in these same trials. The initial weight of steers averaged 250 kg and the average duration of the five trials was 124 d. Estradiol-controlled release implants increased ADG by 15.6% (.095 kg/d; P less than .0001) and monensin increased ADG by 8.1% (.054 kg/d; P less than .05). The combination of estradiol-controlled release implant and monensin increased ADG by 27.4% (.168 kg/d). Treatment responses were additive relative to ADG response, with no interaction observed between the treatments. Nine-tenths kilograms of an energy supplement/d increased ADG by 12.4% (.073 kg/d; P less than .01).

[1]  F. M. Rouquette,et al.  Effect of monensin on gain and forage utilization by calves grazing bermudagrass. , 1980, Journal of animal science.

[2]  D. Herd,et al.  Growth responses of nursing calves to zeranol implants. , 1980 .

[3]  J. Young,et al.  Effects of monensin on in vivo rumen propionate production and blood glucose kinetics in cattle. , 1978, The Journal of nutrition.

[4]  D. A. Dinius,et al.  Finishing Beef Steers on Forage Diets with Additives and Supplemental Lipid , 1978 .

[5]  A. Trenkle,et al.  Beef production efficiency. , 1977, Science.

[6]  A. Raun,et al.  Effect Monensin on Performance of Cattle Forage , 1976 .

[7]  A. Raun,et al.  Effect of Monensin on Feed Efficiency of Feedlot Cattle , 1976 .

[8]  A. Raun,et al.  Effect of Monensin on Rumen Fermentation in Vitro and in Vivo , 1976 .

[9]  G. V. Davis,et al.  Effects of Monensin and Urea in Finishing Steer Rations , 1976 .

[10]  T. W. Perry,et al.  Effect of Monensin on Beef Cattle Performance , 1976 .

[11]  G. Newton,et al.  Effects of Feeding Monensin in Combination with Zeranol and Testosterone-Estradiol Implants for Growing and Finishing Heifers , 1976 .

[12]  W. M. Oliver.  Effect of Monensin on Gains of Steers Grazed on Coastal Bermudagrass , 1975 .

[13]  A. Trenkle,et al.  Plasma levels of growth hormone, insulin and plasma protein-bound iodine in finishing cattle. , 1970, Journal of animal science.

[14]  G. W. Snedecor.  STATISTICAL METHODS , 1967 .

[15]  A. Struempler,et al.  Stilbestrol Feeding and Growth Hormone Stimulation in Immature Ruminants , 1959 .

[16]  M. S. Bartlett,et al.  Some examples of statistical methods of research in agriculture and applied biology , 1937 .