Hybridization in the Urochloa humidicola breeding programme allowed to explore the genetic variability of the apomictic sources and, thus, to obtain new sexual and apomictic parents with compatible ploidy and/or superior progenies. However, given the high variability arising from crosses, there is a need to adopt efficient selection strategies among and within progenies. The aim of this study was to compare the selection methods among U. humidicola progenies with (t‐BLUP) and without (BLUP) the weighting based on prediction error and subsequent selection within progenies by individual simulated (BLUP_IS) or optimal individual BLUP. We evaluated seventy‐one U. humidicola full‐sib progenies from biparental crosses between nine sexual and ten apomictic parents. The experiment was set up in an incomplete block design with 64 blocks of 15 plots each, consisting of individual plants. Seven consecutive cuts were made and the traits total dry‐matter, leaf dry‐matter and regrowth scores were measured. Genetic variance was expressive for all traits. The selection procedure among progenies of U. humidicula based on t‐BLUP proved to be more advantageous regarding the use of BLUP not weighted by the prediction error, resulting in higher selection gains, taking as reference the optimal procedure of the individual BLUP. Furthermore, the use of BLUP_IS allowed an optimized selection of hybrids, allowing the breeder to explore with variable selection intensity the genetic variability within the selected full‐sib progenies based on relative genetic merit.

中文翻译：

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乌拉乌拉氏菌全兄弟后代之间及其内部选择方法的比较

Urochloa cubaticola育种计划中的杂交可以探索无融合生殖来源的遗传变异性，从而获得具有倍性和/或优良后代的新的性和无融合生殖亲本。但是，鉴于杂交产生的高度变异性，有必要在子代之间和子代内采用有效的选择策略。这项研究的目的是比较带有（t-BLUP）和不带有（BLUP）的U. umitricola后代在预测误差和随后通过个体模拟（BLUP _IS）或最佳个体BLUP进行的后代选择中的选择方法。我们评估了71个湿地U来自九个性父母和十个无融合生殖父母之间的双亲杂交的全同胞子代。实验以不完整的块设计进行设置，每个块由15个地块组成，每个块由64个块组成。进行了七次连续切割，测量了性状总干物质，叶片干物质和再生长分数。遗传变异表现出所有性状。在不使用预测误差加权的BLUP的使用上，基于t-BLUP的U子后代的选择程序被证明是更有利的，从而获得了更高的选择增益，并将单个BLUP的最佳程序作为参考。此外，使用BLUP _IS 允许对杂种进行优化选择，使育种者可以根据相对遗传优劣，以可变的选择强度探索所选全同胞后代内的遗传变异性。