J.L. Sperber , E.A. Schumacher , D.J. Jordon , R.J. Cooper , T.L. Scott , S. Bundy , D.B. Burken , G. Sides , R.M. Cleale , G.E. Erickson
{"title":"单次缓释植入和再次植入策略对肉牛育成母牛的性能和胴体特征的影响比较","authors":"J.L. Sperber , E.A. Schumacher , D.J. Jordon , R.J. Cooper , T.L. Scott , S. Bundy , D.B. Burken , G. Sides , R.M. Cleale , G.E. Erickson","doi":"10.15232/aas.2023-02533","DOIUrl":null,"url":null,"abstract":"<div><h3>Objective</h3><p>A commercial feedlot experiment evalu- ated the effects of implanting heifers with an extended- release implant (Synovex One Feedlot) compared with a re-implant strategy (Synovex Choice followed by Synovex Plus) on finishing heifer performance, animal health, and carcass characteristics.</p></div><div><h3>Materials and Methods</h3><p>Using a randomized com- plete block design, crossbred heifers (n = 1,737; initial BW = 313 kg ± 15.3 kg) were randomly assigned to 24 pens across 2 treatments for an average of 181 d experi- ment. Treatments included a single extended-release im- plant administered on d 0 (Synovex One Feedlot; ONE) or a re-implant strategy of Synovex Choice (d 0) followed by Synovex Plus (CH/PLUS) on d 93 to 95.</p></div><div><h3>Results and Discussion</h3><p>There were no differences in live final BW or ADG between the 2 implant strate- gies; however, heifers implanted with CH/PLUS had 2.5% greater carcass-adjusted feed efficiency than ONE heif- ers. The CH/PLUS strategy produced heavier hot carcass weight (387 vs. 384 kg), larger LM area (87.9 vs. 85.3 cm<sup>2</sup>), and greater DP (62.30% vs. 61.96%) compared with ONE. Heifers implanted with ONE had greater marbling score, calculated YG, and 12th-rib fat (1.97 vs. 1.89 cm) compared with CH/PLUS heifers, resulting in a difference in QG and YG distribution between the 2 implant strate- gies. No differences were observed between treatments in morbidity, mortality, or pen removals.</p></div><div><h3>Implications and Applications</h3><p>These results indi- cate that heifers receiving a more aggressive re-implant strategy have heavier hot carcass weight, greater yield, and larger LM area, but reduced marbling compared with heifers that received an extended-release implant.</p></div>","PeriodicalId":8519,"journal":{"name":"Applied Animal Science","volume":"40 5","pages":"Pages 661-668"},"PeriodicalIF":1.4000,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590286524000983/pdf?md5=b6620ca113d87dba00b2ad7fd5fb3d29&pid=1-s2.0-S2590286524000983-main.pdf","citationCount":"0","resultStr":"{\"title\":\"Comparison of a single extended-release implant and a re-implant strategy on performance and carcass characteristics of beef finishing heifers\",\"authors\":\"J.L. 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Treatments included a single extended-release im- plant administered on d 0 (Synovex One Feedlot; ONE) or a re-implant strategy of Synovex Choice (d 0) followed by Synovex Plus (CH/PLUS) on d 93 to 95.</p></div><div><h3>Results and Discussion</h3><p>There were no differences in live final BW or ADG between the 2 implant strate- gies; however, heifers implanted with CH/PLUS had 2.5% greater carcass-adjusted feed efficiency than ONE heif- ers. The CH/PLUS strategy produced heavier hot carcass weight (387 vs. 384 kg), larger LM area (87.9 vs. 85.3 cm<sup>2</sup>), and greater DP (62.30% vs. 61.96%) compared with ONE. Heifers implanted with ONE had greater marbling score, calculated YG, and 12th-rib fat (1.97 vs. 1.89 cm) compared with CH/PLUS heifers, resulting in a difference in QG and YG distribution between the 2 implant strate- gies. 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Comparison of a single extended-release implant and a re-implant strategy on performance and carcass characteristics of beef finishing heifers
Objective
A commercial feedlot experiment evalu- ated the effects of implanting heifers with an extended- release implant (Synovex One Feedlot) compared with a re-implant strategy (Synovex Choice followed by Synovex Plus) on finishing heifer performance, animal health, and carcass characteristics.
Materials and Methods
Using a randomized com- plete block design, crossbred heifers (n = 1,737; initial BW = 313 kg ± 15.3 kg) were randomly assigned to 24 pens across 2 treatments for an average of 181 d experi- ment. Treatments included a single extended-release im- plant administered on d 0 (Synovex One Feedlot; ONE) or a re-implant strategy of Synovex Choice (d 0) followed by Synovex Plus (CH/PLUS) on d 93 to 95.
Results and Discussion
There were no differences in live final BW or ADG between the 2 implant strate- gies; however, heifers implanted with CH/PLUS had 2.5% greater carcass-adjusted feed efficiency than ONE heif- ers. The CH/PLUS strategy produced heavier hot carcass weight (387 vs. 384 kg), larger LM area (87.9 vs. 85.3 cm2), and greater DP (62.30% vs. 61.96%) compared with ONE. Heifers implanted with ONE had greater marbling score, calculated YG, and 12th-rib fat (1.97 vs. 1.89 cm) compared with CH/PLUS heifers, resulting in a difference in QG and YG distribution between the 2 implant strate- gies. No differences were observed between treatments in morbidity, mortality, or pen removals.
Implications and Applications
These results indi- cate that heifers receiving a more aggressive re-implant strategy have heavier hot carcass weight, greater yield, and larger LM area, but reduced marbling compared with heifers that received an extended-release implant.
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