Performance of Feedlot Steers Reimplanted with DES or Synovex-S

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Abstract
Seventy pens of crossbred beef steers (16,240 head) were obtained from either a drylot feeding program (Source I) or from oat pasture (Source II) before implanted with DES upon arrival at a commercial feedlot in the Texas panhandle. Ninety-one days later, one-half of the steers from each source were reimplanted with DES and the other half with Synovex-S to evaluate possible differences between reimplanted steers. Steers from Source I gained more (P<.01) than those from Source II during Phase I; the reverse of this trend was observed in Phase II. Incidence of buller steers was influenced by source (P<.01) during Phase I. In Phase II there was a 104% difference between reimplant treatments for incidence of bullers (1.65% for DES + DES vs 3.36% for DES + Synovex-S). Feed efficiency, final weights and sale prices of steers were not significantly influenced by type of reimplant. Economic studies that considered incidence of buller steers, buller pen residence time of buller steers and cost of each implant revealed an economic advantage of $1.15 per steer fed in the DES + DES treatment over those in the DES + Synovex-S treatment during 1974–75. Copyright © 1979. American Society of Animal Science . Copyright 1979 by American Society of Animal Science.

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