Administering the maternal appeasing substance before slaughter to improve carcass characteristics of finishing cattle

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
S. Mackey, R. Cooke, A. Pickett
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Abstract

Abstract Two experiments evaluated carcass characteristics of finishing steers administered the maternal bovine appeasing substance (mBAS) prior to slaughter. In Exp. 1, 954 Angus-influenced finishing steers housed in 6 original pens were used. Each original pen was split into a pair of experimental pens 14.3 d ± 3 d prior to slaughter, in a manner that number of steers and average pen body weight (BW; 636 ± 4 kg) were similar. An oiler containing mBAS (Ferappease Finish Cattle 5%; FERA Diagnostics and Biologicals; College Station, TX) was added to one of the experimental pens 7 d prior to slaughter (n = 6), whereas the other pen did not contain an oiler (CON; n = 6). The oiler delivered 120 mL of mBAS/steer during a 7-d period. Steer BW was recorded 7 d prior to and during loading (final BW) to the packing plant. No treatment effects were detected (P ≥ 0.51) for BW gain, final BW, and proportion of carcasses that graded Choice or Prime. Carcass dressing percentage was greater (P = 0.02) in mBAS compared with CON steers (65.9% vs. 64.2%; SEM = 0.5), which was not sufficient to impact hot carcass weight (HCW; P = 0.29). Incidence of dark-cutting carcasses did not differ between treatments (P = 0.23). In Exp. 2, 80 Angus-influenced finishing steers housed in 16 pens (5 steers/pen; 600 ± 4 kg of BW) were used. Pens were arranged in 4 rows of 4 pens/row, and rows were alternately assigned to receive an oiler containing mBAS (n = 8) or mineral oil (CON+; n = 8) 7 d prior to slaughter. Oilers were designed to deliver 120 mL/steer of mBAS or mineral oil during the 7-d period. Steer BW was recorded as in Exp. 1, and a blood sample was collected during exsanguination. No treatment effects were detected (P ≥ 0.20) for BW parameters, carcass marbling score, backfat thickness, Longissimus muscle area, yield grade, and proportion of carcasses that graded Choice or Prime. Carcass dressing was greater (P = 0.02) in mBAS steers compared with CON + (60.6 vs. 59.6%; SEM = 0.3) but HCW did not differ (P = 0.47) between treatments. Plasma cortisol concentration was less (P < 0.01) in mBAS steers compared with CON + (11.7 vs. 20.8 ng/mL; SEM = 1.6). Incidence of dark-cutting carcasses did not differ (P = 0.53) between treatments. In summary, mBAS administration to finishing cattle using oilers during the last 7 d on feed alleviated the adrenocortical stress response elicited by the process of slaughter, which likely resulted in increased carcass dressing.
在屠宰前施用母性绥靖物质以改善育成牛的胴体特征
摘要 两项实验评估了在屠宰前添加母牛绥靖物质(mBAS)的育成公牛的胴体特征。在实验 1 中,使用了饲养在 6 个原始牛栏中的 954 头安格斯育成牛。在屠宰前 14.3 天 ± 3 天,每个原始牛栏被分成一对实验牛栏,牛的数量和牛栏平均体重(BW;636 ± 4 千克)相似。在屠宰前 7 d(n = 6),将含有 mBAS 的注油器(Ferappease Finish Cattle 5%; FERA Diagnostics and Biologicals; College Station, TX)添加到其中一个实验牛栏,而另一个牛栏则不含注油器(CON; n = 6)。注油器在 7 天内为每头牛输送 120 毫升 mBAS。在装载(最终体重)到包装厂前 7 天和装载期间记录陡坡牛的体重。在体重增重、最终体重以及胴体分级为优质或优选的比例方面,未发现处理效果(P ≥ 0.51)。与 CON 牛相比,mBAS 牛的胴体去皮率更高(P = 0.02)(65.9% 对 64.2%;SEM = 0.5),但这不足以影响热胴体重量(HCW;P = 0.29)。不同处理的胴体暗割发生率没有差异(P = 0.23)。在实验 2 中,使用了 80 头安格斯育成牛,分别饲养在 16 个栏(每栏 5 头;体重 600 ± 4 千克)中。牛栏按 4 行排列,每行 4 头,在屠宰前 7 天交替分配给含有 mBAS(n = 8)或矿物油(CON+;n = 8)的注油器。注油器的设计是在 7 天内每头牛输送 120 毫升 mBAS 或矿物油。与实验 1 一样记录母牛的体重,并在抽血时采集血样。在体重参数、胴体大理石花纹评分、背膘厚度、长腱肌肉面积、产量等级以及精选或优质胴体比例方面,未发现处理效果(P ≥ 0.20)。与 CON +(60.6% 对 59.6%;SEM = 0.3)相比,mBAS 牛的胴体修饰率更高(P = 0.02),但不同处理间的 HCW 没有差异(P = 0.47)。与 CON + 相比,mBAS 牛的血浆皮质醇浓度较低(P < 0.01)(11.7 vs. 20.8 ng/mL;SEM = 1.6)。不同处理之间胴体暗割的发生率没有差异(P = 0.53)。总之,在最后 7 天的饲养过程中对使用榨油机的育成牛施用 mBAS 可减轻屠宰过程引起的肾上腺皮质应激反应,这可能会导致胴体着色增加。
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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