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核心技术专利：CN118964589B侵权必究

核心技术专利：CN118964589B侵权必究

Tufvesson B, Tufvesson M, Lillpers K, Johansson K, Wilhelmson M

Department of Animal Breeding and Genetics, Swedish University of Agricultural Sciences, Uppsala.

Br Poult Sci. 1999 May;40(2):209-16. doi: 10.1080/00071669987610.

Divergent selection for comb shape (SH, the way that the cockerel bears the comb) was performed in 2 White Leghorn lines in a study aimed at assessing possibilities for improving SH. 2. Line A, selected for large comb size (CS) at 29 weeks of age, had great SH problems whereas Line H, selected for high hyaluronic acid concentration in the comb (HA), had minor SH problems. Multivariate analyses were used to estimate genetic parameters for SH, CS and HA in lines A and H and in a control line (C). 3. Significant direct selection responses for SH were achieved in both lines. There were significant unfavourable correlated responses for CS in both lines. 4. The correlated responses for HA were not significant and were unfavourable in Line A and favourable in Line H. 5. Heritabilities for SH and CS were high in both lines and relatively low for HA. Most of the genetic correlations were in agreement with the correlated responses obtained.

在两项白来航品系中针对鸡冠形状（SH，即公鸡鸡冠的形态）进行了 divergent 选择，该研究旨在评估改善 SH 的可能性。2. A 系在 29 周龄时因鸡冠尺寸大（CS）而被选择，存在严重的 SH 问题；而 H 系因鸡冠中透明质酸浓度高（HA）而被选择，SH 问题较小。使用多变量分析来估计 A 系、H 系和对照系（C）中 SH、CS 和 HA 的遗传参数。3. 两个品系中 SH 均获得了显著的直接选择反应。两个品系中 CS 均出现了显著的不利相关反应。4. HA 的相关反应不显著，在 A 系中为不利反应，在 H 系中为有利反应。5. 两个品系中 SH 和 CS 的遗传力都很高，而 HA 的遗传力相对较低。大多数遗传相关性与所获得的相关反应一致。

Tufvesson B, Tufvesson M, Lillpers K, Johansson K, Wilhelmson M

Department of Animal Breeding and Genetics, Swedish University of Agricultural Sciences, Uppsala.

Br Poult Sci. 1999 May;40(2):209-16. doi: 10.1080/00071669987610.

Divergent selection for comb shape (SH, the way that the cockerel bears the comb) was performed in 2 White Leghorn lines in a study aimed at assessing possibilities for improving SH. 2. Line A, selected for large comb size (CS) at 29 weeks of age, had great SH problems whereas Line H, selected for high hyaluronic acid concentration in the comb (HA), had minor SH problems. Multivariate analyses were used to estimate genetic parameters for SH, CS and HA in lines A and H and in a control line (C). 3. Significant direct selection responses for SH were achieved in both lines. There were significant unfavourable correlated responses for CS in both lines. 4. The correlated responses for HA were not significant and were unfavourable in Line A and favourable in Line H. 5. Heritabilities for SH and CS were high in both lines and relatively low for HA. Most of the genetic correlations were in agreement with the correlated responses obtained.

在两项白来航品系中针对鸡冠形状（SH，即公鸡鸡冠的形态）进行了 divergent 选择，该研究旨在评估改善 SH 的可能性。2. A 系在 29 周龄时因鸡冠尺寸大（CS）而被选择，存在严重的 SH 问题；而 H 系因鸡冠中透明质酸浓度高（HA）而被选择，SH 问题较小。使用多变量分析来估计 A 系、H 系和对照系（C）中 SH、CS 和 HA 的遗传参数。3. 两个品系中 SH 均获得了显著的直接选择反应。两个品系中 CS 均出现了显著的不利相关反应。4. HA 的相关反应不显著，在 A 系中为不利反应，在 H 系中为有利反应。5. 两个品系中 SH 和 CS 的遗传力都很高，而 HA 的遗传力相对较低。大多数遗传相关性与所获得的相关反应一致。