A commercial scale evaluation of the effects of post-weaning management system of dairy × beef hybrid steers compared to native beef steers on performance, carcass characteristics, and net returns.
Ally Grote, Tom Fanning, Eric A DeVuyst, Zane Grigsby, Justin Crosswhite, Paul Beck
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引用次数: 0
Abstract
Our objective was to determine the effect of calf-fed (CF) or yearling-fed (YF) finishing systems on performance and carcass characteristics of beef × dairy (DB) crossbred steers compared to native beef (NB) steers. The NB steers (n = 160) were acquired from Capitol Land and Livestock in Schwertner, Texas. The DB steers (n = 184) were acquired from 5-Star Dairy in Hart, Texas. The CF (n = 194) steers were transported directly to a commercial feedyard (Buffalo Feeders, Buffalo, OK) from the source. Steers in the YF system (n = 150) were transported to the Marvin Klemme Research Range, near Bessie, OK, to graze mixed grass prairie for 144-d before finishing. At Buffalo Feeders, steers were sorted by finishing system and breed-type into commercial size pens, so each breed-type × system combination were in a single pen. Data were analyzed using SAS 9.4 Mixed Procedure (SAS Institute, Cary, NC) with individual steer as the experimental unit. For CF, initial finishing BW did not differ for DB and NB (P = 0.11), while the initial finishing BW of NBYF was greater (P < 0.01) than DBYF due to NBYF steers having greater ADG on pasture. At reimplant, BW of YF steers was greater (P < 0.01) than CF steers. The DBYF steers had the greatest overall ADG (P < 0.01) with NBCF having the least ADG (P < 0.01) with NBYF and DBCF being intermediate. Back-fat thickness (P = 0.03) was greatest in NBCF, and DBYF having the least BFT, while DBCF and NBYF were intermediate. Overall liver abscesses had breed-type (P < 0.01) and finishing system effects (P = 0.01) with DB and YF steers having higher incidence of liver abscesses. Total net return was greatest (P < 0.01) in NBYF followed by DBYF, DBCF, and NBCF, respectively. Grazing beef × dairy steers before feedlot finishing can improve animal performance and certain carcass characteristics, but there is still a high incidence of liver abscesses. Since DB systems had intermediate returns, these animals can be competitive to their NB counterparts, but the higher prevalence of liver abscesses needs to be further researched.
我们的目的是确定犊牛饲喂（CF）或1年饲喂（YF）育肥系统对牛乳杂交（DB）阉牛生产性能和胴体特性的影响，并与本地肉牛（NB）阉牛进行比较。NB阉牛（n = 160）购自德克萨斯州Schwertner的Capitol Land and Livestock。DB阉牛（n = 184）购自德克萨斯州哈特市的五星乳业公司。CF （n = 194）牛从源头直接运送到商业饲料场（Buffalo Feeders, Buffalo， OK）。YF系统中的耕牛（n = 150）被运送到位于奥克萨斯州贝西附近的Marvin Klemme研究牧场，在完成前进行144天的混合草地放牧。在Buffalo Feeders，根据肥育系统和品种类型将阉牛分类到商业大小的栏中，因此每种品种类型×系统组合在一个栏中。数据分析采用SAS 9.4混合程序（SAS Institute, Cary， NC），以个体转向为实验单元。对于CF， DB和NB的初始育肥力无显著差异（P = 0.11）， NBYF的初始育肥力以NBCF最高（P P P P P = 0.03）， DBYF最低，DBCF和NBYF居中。肝脓肿总体呈品种型（P P = 0.01），其中DB和YF的发生率较高。总净收益最高(P
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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