Live and carcass production traits for progeny of an F1 USDA Prime-Yield Grade 1 carcass clone sire compared to progeny of popular beef terminal sires.
Forest L Francis, Becca B Grimes, Dean E Hawkins, David G Lust, Trent J McEvers, Travis C Tennant, Gregg O Veneklasen, Jason M Abraham, Justin F Gleghorn, Ty E Lawrence
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Abstract
The cloning of beef carcasses that grade United States Department of Agriculture (USDA) Prime-yield grade (YG) 1 (P1) has produced a sire that ranked well against high-performing bulls from multiple breeds. An F1 (P1 × P1 - first generation offspring) sire would ideally outperform its high-performing parents. A terminal sire study was conducted comparing progeny of an F1 (P1 × P1) sire (AxG1) against progeny (heifers and steers) of four high-performing sires of varying breeds {P1 (ALPHA); Angus; Simmental; Angus × Simmental}. Production traits included morbidity and mortality frequencies, weaning weight, feedlot arrival weight, and days on feed; carcass traits included frequency of abscessed liver and lung health, quality grade and YG parameters, total carcass value (US$), and carcass value per hundredweight (CWT [45.4 kg]; US$). A completely randomized experimental design was used; data were analyzed using a mixed model with a fixed effect of sire and random effects of harvest date, sex, and pen. AxG1 sired heifers had the highest (P < 0.01) marbling score, the highest (P < 0.01) carcass value per CWT, and numerically had the lowest calculated YG and highest frequency of YG one carcass. Steers sired by AxG1 had the least (P = 0.05) backfat, lowest (P < 0.01) calculated YG, highest (P < 0.01) marbling score, highest (P < 0.01) frequency of USDA Prime carcasses, the greatest (P < 0.03) total carcass value, and greatest (P < 0.01) carcass value per CWT. Collectively, AxG1 steer and heifer carcasses exhibited the least 12th rib fat thickness and lowest USDA YG in addition to the largest longissimus muscle area, highest marbling score, and greatest frequency of USDA Prime. These data suggest that AxG1 performed comparably to other high-performing industry terminal sires in carcass quality and YG outcomes.
通过克隆美国农业部（USDA）优质产量等级（YG）1（P1）的牛肉胴体，培育出了一种能与多个品种的高产公牛相媲美的父本。理想情况下，F1（P1 × P1 - 第一代后代）父本的表现会优于其表现优异的父本。我们进行了一项终端父本研究，将 F1（P1 × P1）父本（AxG1）的后代与四个不同品种的高产父本{P1（ALPHA）；安格斯；西门塔尔；安格斯×西门塔尔}的后代（母牛和公牛）进行比较。生产性状包括发病率和死亡率、断奶体重、到达饲养场体重和饲喂天数；胴体性状包括脓肝频率和肺健康状况、质量等级和YG参数、胴体总价值（美元）和每百公斤胴体价值（CWT [45.4 kg]；美元）。试验采用完全随机试验设计；数据分析采用混合模型，其中母系具有固定效应，收获日期、性别和栏位具有随机效应。AxG1 母牛的背膘最高 (P P P = 0.05)、最低 (P P P P = 0.05)、最高 (P P P = 0.05)、最低 (P P P = 0.05)。
期刊介绍：
Translational Animal Science (TAS) is the first open access-open review animal science journal, encompassing a broad scope of research topics in animal science. TAS focuses on translating basic science to innovation, and validation of these innovations by various segments of the allied animal industry. Readers of TAS will typically represent education, industry, and government, including research, teaching, administration, extension, management, quality assurance, product development, and technical services. Those interested in TAS typically include animal breeders, economists, embryologists, engineers, food scientists, geneticists, microbiologists, nutritionists, veterinarians, physiologists, processors, public health professionals, and others with an interest in animal production and applied aspects of animal sciences.
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