Comparison of a single extended-release implant and a re-implant strategy on performance and carcass characteristics of beef finishing heifers

IF 1.4 Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE
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
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Abstract

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.

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
目的一项商业化饲养场实验评估了给母牛植入缓释植入物(Synovex One Feedlot)与再次植入策略(Synovex Choice 后再植入 Synovex Plus)对育成母牛的性能、动物健康和胴体特征的影响。材料与方法采用随机整群设计,将杂交小母牛(n = 1,737 头;初始体重 = 313 kg ± 15.3 kg)随机分配到 2 种处理的 24 个栏中,平均试验 181 天。处理包括在第 0 天施用单一缓释植入剂(Synovex One Feedlot;ONE),或在第 93 至 95 天再次植入 Synovex Choice(第 0 天)和 Synovex Plus(CH/PLUS)。与 ONE 相比,CH/PLUS 策略产生的热胴体重量更重(387 千克对 384 千克)、LM 面积更大(87.9 平方厘米对 85.3 平方厘米)、DP 更大(62.30% 对 61.96%)。与 CH/PLUS 母牛相比,植入 ONE 的母牛的大理石纹评分、计算 YG 和第 12 肋脂肪(1.97 vs. 1.89 厘米)更高,这导致两种植入策略之间的 QG 和 YG 分布存在差异。这些结果表明,与接受缓释植入的小母牛相比,接受更积极的再植入策略的小母牛胴体热重更重、产量更高、LM 面积更大,但大理石花纹减少。
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来源期刊
Applied Animal Science
Applied Animal Science AGRICULTURE, DAIRY & ANIMAL SCIENCE-
CiteScore
3.00
自引率
6.70%
发文量
68
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