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Five field trials were conducted with 762 steers and heifers in cooperation with four commercial feedlots to evaluate the effects of Finaplix in combination with Ralgro or Synovex for growing and finishing programs. Implant dosage rates used in the experimental treatments included: 1) Finaplix-S 2 , 140 mg trenbolone acetate; 2) Finaplix-H 2 , 200 mg trenbolone acetate; 3) Ralgro 1 , 36 mg zeranol; 4) Synovex-S , 200 mg progesterone and 20 mg estradiol benzoate; and 5) Synovex-H , 200 mg testosterone propionate and 20 mg estradiol benzoate. In Trial 1, 176 spring-born Hereford steers averaging 223 kg were used to study sequential implantation with Synovex-S (S) or Synovex-S + Finaplix-S (S+F) during wheat grazing and the early and late finishing phases of this 267-d trial. During the 108d wheat pasture phase, the addition of Finaplix increased gains 8.2%. In the appreciation is expressed to International Minerals and Chemical Co., Terra Haute, IN, for financial support of this study. Hoechst-Roussel Agri-Vet Co., Somerville, NJ. Syntex Animal Health Inc., Des Moines, LA. 30 subsequent early finishing phase, Finaplix treatment tended (P = .11) to increase performance. The implant treatments used in the late finishing phase resulted in no significant (P > .05) differences in daily gain and carcass characteristics. However, when prior implant treatments were ignored by using orthogonal contrasts, implanting with S+F increased (P < .05) average daily gain during both early and late finishing phases, compared with S alone. Overall 267-d gain and carcass weight were increased (P < .05), and marbling score was decreased (P = .06) when S+F was used in the late finishing phase. In Trials 2 and 3, 374 yearling crossbred steers were allotted to four finishing treatments: 1) Ralgro, 2) Ralgro plus Finaplix-S, 3) Synovex-S and 4) Synovex-S plus Finaplix-S. Implant treatments did not differentially affect gain, carcass weight, backfat thickness, percentage kidney, heart, and pelvic fat or ribeye area in either trial. Finaplix use did not affect carcass quality. However, in Trial 2, Synovex-implanted cattle had lower marbling scores and fewer carcasses graded Choice (P < .05) compared to Ralgro steers. In Trial 4, 126 yearling heifers averaging 329 kg were implanted with Synovex-H initially and allotted 49 d later to four finishing reimplant treatments: 1) no implant, 2) Synovex-H, 3) Finaplix-H or 4) Synovex-H plus Finaplix-H. Reimplanting heifers had no effect on gain or carcass characteristics, except for the percentage grading Choice, which was reduced (P < .05) in the F and S+F groups. Hide weights and hide pull scores tended to be increased slightly in the heifers implanted with Finaplix. In Trial 5, 86 crossbred steer calves averaging 227 kg were allotted to two

Effects of Finapux® in combination with Ralgro® and Synovex® on performance and carcass characteristics of steers and heifers