steers, calf, corn silage, laidlomycin propionate, lonophore
The inophore laidlomycin propionate2 (LP) became available in 1995 to improve ADG of cattle fed in confinement. Initial efficacy studies focused on finishing diets and yearling cattle. Limited data are available to quantify the benefits of using LP in calf grower programs. To evaluate LP efficacy for calves, receiving-grower diets based on corn silage were formulated to contain 0, 5.5, or 11 g/T LP and were fed to recently weaned steer calves. Five pens of 10 steers (initial BW = 483 Ib) were assigned to each diet. The grower phase was terminated after 98 days on feed. Final diet ionophore concentrations of 4.6 and 9.6 g/T were below formula specifications. Assays of supplements indicated a significant loss of ionophore during feed manufacture. The cause of this loss was not identifiable from the sampling procedures used. The higher dosage of LP reduced (P< .05) DM1 through the initial 56 days on feed while having no effect on average daily gain. After 56 days on feed, steers fed the higher LP diet exhibited greater (P<.05) ADG and better (P<.05) feed efficiency than steers fed the low LP diet. Cumulative steer performance included an improvement (P< .05) in feed efficiency when LP was fed at 9.6 g/T.
Number of Pages
South Dakota State University
Copyright © 1995 South Dakota State University.
Pritchard, R. H., "Dosages of Laidlomycin Propionate for Receiving and Growing Diets Fed to Steer Calves" (1995). South Dakota Beef Report, 1995. 13.