275 Comparison of Revalor-xh with a revalor-ih/revalor-h/revalor-200 Re-implant Program on Feedlot Cattle. (7th May 2021)

• Record Type: Journal Article
• Authors: Gibbons, John; Streeter, Marshall N; Nuttelman, Brandon L; Erickson, Galen E; Dicke, Bill
• Is Part Of: Journal of animal science. Volume 99(2021)Supplement 1
• Page Start: 130
• Page End: 130
• Publication Date: 2021-05-07
• Subjects: heifer -- implant -- payout; Livestock -- Periodicals; Livestock; Electronic journals; Periodicals; 636.005
• DOI: 10.1093/jas/skab054.218
• Languages: English
• ISSNs: 0021-8812

Abstract

Abstract: A commercial feedlot trial evaluated a 3-implant re-implant program using Revalor-IH/Revalor-H/Revalor-200 compared to a single Revalor-XH (200 mg TBA and 20 mg E2 partially coated) implant strategy on feedlot performance and carcass characteristics of calf fed heifers. Heifer calves (n = 1356) were purchased through time and blocked by source and arrival date, assigned randomly to pen within block, and pen assigned randomly to one of the two implant treatments. Heifers who received the 3-implant re-implant treatment were re-implanted on d67 with Revalor-H and on d137 with Revalor-200. Each block of cattle were harvested on the same study day, which averaged 215 days on feed. Performance data were analyzed as a randomized block design, with the blocking factor as source/arrival time being considered random. Implant strategy was analyzed as a fixed effect with pen (n = 20) as the experimental unit. On a live basis, heifers implanted with Revalor-XH had a tendency for a greater gain efficiency (P = 0.06) though there were no significant differences between implant treatments for final body weight, gain or intake (P ≥ 0.15). There were no significant differences between implant treatments for hot carcass weight, gain, or gain efficiency (P ≥ 0.29) on a carcass-adjust basis. Marbling score and 12th rib fat thickness were not impacted by implant treatment (P ≥ 0.80); however, there was an increase in LM area (P = 0.02) for heifers on the 3-implant re-implant treatment compared to the Revalor-XH implanted heifers. There was also a tendency for a greater calculated YG in heifers who received Revalor-XH (P = 0.07). Heifers fed for approximately 215 d with a single Revalor-XH implant performed similarly to heifers fed the same amount of days receiving a 3-implant re-implant strategy using Revalor-IH/H/200 combination.