Precision feeding (PF) with the daily mixing of 2 diets with different lysine content (high (H) or low (L)) was previously reported for growing pigs to reduce protein intake and N excretion compared with a conventional feeding (CF) based on a single diet (C). Using a simulation approach based on farm data, the objective of the present paper was to describe and evaluate a decision support system for the PF of gestating sows allowing the daily distribution of a tailored ration to each sow. Two datasets, 1 of 2,511 gestations (farm A) and 1 of 2,528 gestations (farm B), reporting sows’ characteristics at insemination and objectives at farrowing were used as inputs for a Python model. This model, mainly based on InraPorc, calculates the nutrient requirements of each sow over gestation and simulates the impact of PF in comparison to CF. Simulated diets L, H, and C contained 3.0, 6.5, and 4.8 g/kg of standardized ileal digestible lysine (SID Lys) and 2.0, 3.3, and 2.5 g/kg of standardized total tract digestible phosphorus (STTD-P), respectively. The influence of farm, parity, gestation week, and their interactions, on calculated SID Lys and STTD-P requirements was analyzed applying a mixed model. The calculated SID Lys and STTD-P requirements increased markedly in the last third of gestation (P < 0.01) and were higher for primiparous than for multiparous sows, unless after week 14 for STTD-P requirement. The calculated SID AA and mineral requirements were lower for farm B than farm A (respectively, 2.94 vs. 3.08 g/kg for SID Lys and 1.30 vs. 1.35 g/kg for STTD-P, P < 0.01). On average, feed L represented 86% and 92% of the feed projected to be delivered by the PF strategy in farms A and B, respectively. Compared to CF, average calculated dietary SID Lys content was lowered by 27% and 32% with PF, for farms A and B, respectively, while average calculated dietary phosphorus content was lowered by 13% and 16%. The simulated proportions of sows in excess and deficient in SID Lys were reduced with PF. Compared to CF, the PF strategy allowed for a 3.6% reduction in simulated feed cost per sow during gestation, and reduced nitrogen and phosphorus intake (by 11.0% and 13.8%, respectively) and excretion (by 16.7% and 15.4%, respectively). To conclude, these simulations indicate that PF of gestating sow appears to be relevant to meet the amino acid requirement while reducing feed cost, and supplies and excretion of nitrogen and phosphorus.

中文翻译：

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评估妊娠母猪精确饲喂决策支持系统。

以前有报道称，与常规饲喂（CF）相比，每天饲喂两种不同赖氨酸含量（高（H）或低（L））的日粮进行精确饲喂（PF）与常规饲喂（CF）相比可减少蛋白质摄入和氮排泄。单一饮食（C）。使用基于农场数据的模拟方法，本论文的目的是描述和评估妊娠母猪PF的决策支持系统，该系统可以每天向每个母猪分配定制的日粮。两个数据集分别报告了2,511个妊娠中的1个（农场A）和2,528个妊娠中的1个（农场B），它们报告了授精时的母猪特性和分娩时的目标，作为Python模型的输入。该模型主要基于InraPorc，计算每个母猪在妊娠期的营养需求，并模拟PF与CF相比的影响。模拟日粮L，H和C分别含有3.0、6.5和4.8 g / kg的标准化回肠可消化赖氨酸（SID Lys）和2.0、3.3和2.5 g / kg的标准化全道可消化磷（STTD-P）， 分别。使用混合模型分析了农场，胎次，妊娠周及其相互作用对计算的SID Lys和STTD-P需求的影响。计算得出的SID Lys和STTD-P需求量在妊娠的最后三分之一显着增加（P <0.01），初产母猪高于多胎母猪，除非STTD-P需求在第14周后更高。农场B的计算得出的SID AA和矿物质需求低于农场A（分别为SID Lys为2.94 vs. 3.08 g / kg，STTD-P，P为1.30 vs. 1.35 g / kg<0.01）。平均而言，饲料L分别代表农场A和B的PF策略预计投放的饲料的86％和92％。与CF相比，A和B养殖场的PF的平均计算日粮SID Lys含量分别降低了27％和32％，而PA的平均计算日粮磷含量降低了13％和16％。PF降低了SID Lys过量和不足的模拟母猪比例。与CF相比，PF策略可使妊娠期间每头母猪的模拟饲料成本降低3.6％，并将氮和磷的摄入量（分别降低11.0％和13.8％）和排泄（分别降低16.7％和15.4％）。 。总之，这些模拟表明，妊娠母猪的PF似乎与满足氨基酸需求有关，同时降低了饲料成本，