Comparison of restricted selection strategies:: an application to selection of cashmere goats
Comparison of restricted selection strategies:: an application to selection of cashmere goats
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DOI：
10.1016/s0301-6226(99)00014-7
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发表时间：
1999-07-01
期刊：
影响因子：
--
通讯作者：
Rekaya, R
中科院分区：
文献类型：
--
作者：
Díaz, C;Toro, MA;Rekaya, R
研究了限制选择问题。其目的是比较几种策略来改变一个性状，同时试图限制相关性状的变化。要做到这一点，七个选择策略施加限制纤维质量，同时最大限度地提高纤维量进行了研究。使用随机计算机模拟生成了羊绒山羊的闭核方案。核心由200个繁殖雌性组成。除了线性规划和择偶策略外，雄性数量（10只）和交配比例都是恒定的。非限制性或限制性最佳线性无偏预测（BLUP）用于评价目的。选拔工作历时7年进行。比较方面取得的遗传反应，反应的方差和累积水平的近亲繁殖。大多数策略成功地限制了纤维直径，然而，实现了与限制性状相关的纤维数量和方差的反应策略之间差异很大。两步限制BLUP对纤维量产生了类似的反应，并且是比常规限制BLUR更好的限制纤维直径的工具。使用线性规划技术进行雄性选择和使用限制BLUP进行雌性选择似乎是最有吸引力的策略。这一策略是一个很好的折衷之间的限制和实现纤维量的遗传反应。不同策略间的累计近交水平在0.045 ~ 0.101之间。近交水平与反应方差之间的关系没有明确的模式。(C)1999年Elsevier Science BN。All rights reserved.
The problem of restricted selection was investigated. The objective was to compare several strategies to change one trait whilst attempting to restrict changes in a correlated trait. To do so, seven selection strategies to impose a restriction on fibre quality while maximising fibre quantity were studied. A closed nucleus scheme for Cashmere goats was generated using stochastic computer simulation. The nucleus consisted of 200 breeding females. Number of males (ten) and mating ratio were constant except for those strategies in which linear programming and mate selection were applied. Unrestricted or restricted best lineal unbiased prediction (BLUP) were used for evaluation purposes. Selection was carried out during seven years. Comparisons were made in terms of achieved genetic response, variances of response and cumulative level of inbreeding. Most strategies successfully restricted fibre diameter; however, the achieved responses for quantity of fibre and variance of responses associated with restricted trait varied greatly among strategies. Restricted BLUP in two steps resulted in a similar response for fibre quantity and a better tool to restrict fibre diameter than regular Restricted BLUR The use of Linear programming techniques for male selection and Restricted BLUP for females selection appeared to be the most appealing strategy. This strategy was a good compromise between maintenance of the restriction and achieved genetic response for fibre quantity. Resulting cumulative level of inbreeding varied from 0.045 to 0.101 among strategies. There was no clear pattern of the relationship between level of inbreeding and variance of response. (C) 1999 Elsevier Science BN. All rights reserved.