摘要
This study was performed to determine and quantify the inherent auction factors that affect the selling price of beef calves (weanlings - from six to nine months old). Data on the selling price, location and month of the auction, genetic group, lot size live weight, and sex of animals were collected in 148 auctions from January 2004 to December 2014. A total of 4,312 lots corresponding to 48,588 calves were classified into seven genetic groups according to their phenotypic characteristics. The values were deflated using the General Price index (IGP-DI) inflation index and met the parametric assumptions. The selling price was standardized by the yearly median, assuming that its value corresponds to 100%, and the other values varied in their function. Path analysis quantified the direct and indirect effects of the variables taken as explanatory of the selling price, followed by regression analysis and Tukey test. Overall, the direct effect of the average weight was the highest (0.7), followed by sex (0.38). The smallest direct effect was the genetic group (−0.075). There was a growing exponential relationship between average weight of the lot and selling price and a decreasing ratio between price per kilo and the average weight of the lot (−0.0003 percentage points per kilogram). Males were generally 15.7% more valued than females. The British × Zebuine crossbreed was the most valued breed, followed by the British breed (8.9 and 3.6%, respectively). The highest premium was in November, followed by February (9.57 and 8.84%, respectively, compared with median year). The selling price increases linearly by 0.3284 percentage points for each additional animal in the lot. The average weight of the lot was found to be the most important variable in the formation of the selling price, followed by the sex of the animals.
摘要译文
进行这项研究是为了确定和量化影响牛肉犊（断奶-6至9个月大）的售价的内在拍卖因素。从2004年1月至2014年12月的148次拍卖中，收集了有关拍卖价格，拍卖地点和月份，基因组，批量大小活重和动物性别的数据。总共4,312批次对应48,588头犊牛，被划分为七个基因组根据其表型特征。使用通用价格指数（IGP-DI）通胀指数对这些值进行放气，并满足参数假设。假设年度销售价格的中位数等于100％，而其他功能各不相同，则按年中值对销售价格进行标准化。路径分析量化了变量的直接和间接影响，这些变量被用来解释售价，然后进行回归分析和Tukey检验。总体而言，平均体重的直接影响最高（0.7），其次是性别（0.38）。最小的直接影响是遗传群体（-0.075）。批次的平均重量与售价之间的指数关系不断增长，每公斤价格与批次的平均重量之间的比率（-0.0003个百分点/公斤）之间的比率逐渐降低。男性的价值通常比女性高15.7％。英国×Zebuine杂种是最有价值的品种，其次是英国品种（分别为8.9％和3.6％）。保费最高的是11月，其次是2月（与中位数相比分别为9.57和8.84％）。该批次中每增加一只动物的销售价格线性增加0.3284个百分点。发现该批次的平均重量是形成售价的最重要变量，其次是动物的性别。
DANIELCE; Maickel Martins et al.. Inherent auction factors that affect the selling price of calves.[J]. Revista Brasileira de Zootecnia, 2020,49(49)