长期互作轮回选择下白来航鸡群体中近亲繁殖和杂种优势对数量性状的影响

Inbreeding and heterosis effects on quantitative traits in a White Leghorn population under long-term reciprocal recurrent selection.

Flock D K, Ameli H, Glodek P

Institut für Tierzucht und Haustiergenetik, Universität Göttingen, Germany.

Br Poult Sci. 1991 Jul;32(3):451-62. doi: 10.1080/00071669108417370.

Abstract

Inbreeding and heterosis effects for quantitative traits were estimated in two White Leghorn lines selected with reciprocal recurrent selection (RRS) since 1950. 2. Pedigreed progeny were produced from full-sib, half-sib and unrelated pure line as well as reciprocal cross line matings to estimate inbreeding and heterosis effects "within sires". 3. Inbreeding effects estimated as linear regressions agreed well with estimates considering inbreeding as fixed effect. The inbreeding depression per 10% inbreeding was highest for hatchability (6-7%), intermediate for production-related traits (3%), and about 1% for shell quality, body weight and egg weight. 4. Heterosis effects were estimated by comparing pure line and cross line progeny of the same sires. 5. Results indicate considerably less heterosis for egg production than found earlier, which is interpreted as a consequence of pure line selection.

摘要

对自1950年以来通过互作轮回选择（RRS）选育的两个白来航鸡品系的数量性状的近交和杂种优势效应进行了估计。2. 通过全同胞、半同胞和无关纯系以及正反交系交配产生系谱后代，以估计“在父本内”的近交和杂种优势效应。3. 作为线性回归估计的近交效应与将近交视为固定效应的估计结果非常吻合。每10%近交的近交衰退率，孵化率最高（6 - 7%），与生产相关的性状居中（3%），蛋壳质量、体重和蛋重约为1%。4. 通过比较同一父本的纯系和杂交系后代来估计杂种优势效应。5. 结果表明，产蛋量的杂种优势比早期发现的要少得多，这被解释为纯系选择的结果。