摘要
In the Nordic countries of Denmark, Finland, and Sweden, a breeding value for Saved feed is targeted. Saved feed consists of two sub-traits, maintenance and metabolic efficiency, which are evaluated as residual feed intake. This study evaluated residual feed intake in relation to calculated economic values to set breeding goal. Residual feed intake typically is derived using phenotypic or genetic regression. However, when calculating economic value (EV) for residual feed intake, phenotypic and genetic residual feed intake save feed, and so are not relevant; yet, EV is important for the genetic progress of such traits. Thus, phenotypic regression coefficients were used to obtain the economic value of residual feed intake in the current simulation. The SimHerd model was used in this study to quantify the EV of RFI. The economic value of phenotypic residual feed intake ranged from 0.16 to 0.18 €/kg dry matter, corresponding to 0.16 to 0.18 €/Scandinavian feed unit (SFU – 1 SFU corresponds to 0.97 kg dry matter and 6.7 mega joule net energy) in the SimHerd simulation. Thus, the economic value of feed efficiency corresponded to the applied feed price in the simulations (0.18 €/SFU). By splitting phenotypic residual feed intake into two periods (before and after 84 days in milk), we showed that the simulation of biological changes during early lactation showed that the economic value was not dependent on (P > 0.05) residual feed intake being modelled as one or two periods. However, profit per annual cow differed significantly between simulations using one or two residual feed intake periods (P < 0.001). In conclusion, it is very important to select the appropriate the method to estimate breeding values for residual feed intake.
摘要译文
在丹麦，芬兰和瑞典北欧国家，针对保存饲料的繁殖价值。保存的饲料包括两个子特征，维护和代谢效率，可评估为残留进料摄入量。本研究评估了与计算出育种目标的计算经济价值相关的残留饲料摄入量。残留的进料摄入通常是使用表型或遗传回归来源的。但是，在计算残留饲料摄入的经济价值（EV）时，表型和遗传残留饲料摄入量保存饲料，因此不相关;然而，EV对这种特征的遗传进展很重要。因此，使用表型回归系数来获得当前模拟中的残余进料摄入的经济价值。在本研究中使用了辛珀尔德模型以量化RFI的EV。表型残留饲料摄入量的经济价值范围为0.16至0.18欧元的干物质，对应于0.16至0.18€/斯堪的纳维亚饲料单位（SFU - 1 SFU对应于Simherd的0.97千克干物质和6.7兆焦耳净能量）模拟。因此，饲料效率的经济价值对应于模拟中的应用饲料价格（0.18€/ sfu）。通过将表型残留的进料入口分为两个时期（在牛奶中84天之前和84天后），我们表明，早期哺乳期间的生物变化的模拟表明，经济价值不依赖于（P> 0.05）残留的饲料摄入量被建模一两个时期。然而，使用一个或两个残留的进料进料期的模拟之间的每年母牛的利润显着不同（P <0.001）。总之，选择适当的方法来估算残留饲料摄入量的育种值非常重要。
Rasmus B. Stephansen[a][b];Jan Lassen[c];Jehan F. Ettema[d];Lars P. Sørensen[c];Morten Kargo[a][b]. Economic value of residual feed intake in dairy cattle breeding goals[J]. Livestock Science, 2021,253