steer, estradiol, trenbalone, acetate, feedlot
Hereford x Angus (HA) and predominantly Gelbvieh cross (Gx) steer calves either received no implant (control) or were implanted initially and again at 77 days on feed with a combination of estradiol and trenbalone acetate based implants. Calves were started on feed in December weighing 677 Ib and fed for 146 to 167 days. Fed for a common period of time, implanting steers increased (Pc.05) ADG, dry matter intake, final weight, carcass weight, rib fat thickness and yield grade. Implanting reduced (Pc.01) marbling scores. Gx steers were heavier and grew more rapidly than HA steers. There were no interactions between breed type and implant treatments for any variables measured. The action of implants to depress marbling scores is not overcome by increasing steer weight and condition to levels similar to nonimplanted controls.
Number of Pages
South Dakota State University
Copyright © 1989 South Dakota State University
Pritchard, R.H.; Gee, D.H.; and Robbins, M.A., "Effects of Estradiol-Trenbalone Acetate Implant Combinations on Feedlot Performance and Carcass Traits of Two Steer Types" (1990). South Dakota Beef Report, 1990. 11.