Kasari T R, McGrann J M, Hooper R N
Department of Large Animal Medicine and Surgery, Texas Veterinary Medical Center, Texas A&M University, College Station 77843, USA.
J Am Vet Med Assoc. 1997 Oct 1;211(7):856-9.
To develop an economic model for comparing cost-effectiveness of medical and surgical treatment versus replacement of beef bulls with preputial prolapse.
Economic analysis.
Estimates determined from medical records of bulls treated for preputial prolapse at our hospital and from information about treatment of bulls published elsewhere.
Annual depreciation cost for treatment (ADC(T)) and replacement (ADC(R)) were calculated. Total investment for an injured bull equaled the sum of salvage value, maintenance cost, and expected cost of the treatment option under consideration. Total investment for a replacement bull was purchase price. Net present value of cost was calculated for each year of bull use. Sensitivity analyses were constructed to determine the value that would warrant treatment of an injured bull.
The decision to treat was indicated when ADC(T) was less than ADC(R). In our example, it was more cost-effective for owners to cull an injured bull. The ADC(R) was $97 less than ADC(T) for medical treatment ($365 vs $462) and $280 less than ADC(T) for surgical treatment ($365 vs $645). Likewise, net present value of cost values indicated that it was more cost-effective for owners to cull an injured bull. Sensitivity analysis indicated treatment decisions were justified on the basis of replacement value or planned number of breeding seasons remaining for the bull.
The model described here can be used by practitioners to provide an objective basis to guide decision making of owners who seek advice on whether to treat or replace bulls with preputial prolapse.
建立一个经济模型，以比较药物和手术治疗与替换患有阴茎脱垂的肉用公牛的成本效益。
经济分析。
根据我院治疗阴茎脱垂公牛的病历以及其他地方发表的关于公牛治疗的信息进行估算。
计算治疗（ADC(T)）和替换（ADC(R)）的年度折旧成本。受伤公牛的总投资等于残值、维护成本以及所考虑治疗方案的预期成本之和。替换公牛的总投资为购买价格。计算公牛使用每年的成本净现值。进行敏感性分析以确定值得治疗受伤公牛的价值。
当ADC(T)小于ADC(R)时，表明应进行治疗。在我们的例子中，对所有者来说淘汰受伤公牛更具成本效益。药物治疗的ADC(R)比ADC(T)少97美元（365美元对462美元），手术治疗的ADC(R)比ADC(T)少280美元（365美元对645美元）。同样，成本值的净现值表明，对所有者来说淘汰受伤公牛更具成本效益。敏感性分析表明，治疗决策基于公牛的替换价值或剩余的计划繁殖季节数是合理的。
本文所述模型可供从业者使用，为寻求关于是否治疗或替换患有阴茎脱垂公牛建议的所有者的决策提供客观依据。
