旧院黑鸡蓝壳蛋遗传研究

A STUDY ON THE HEREDITY OF BLUE-SHELLED EGGS FROM JIUYUAN BLACK FOWL(GALLUS DOMESTICUS)

用可能产蓝壳蛋的旧院公鸡交褐色罗斯母鸡。其中，２只公鸡的Ｆ＿１代产褐壳或白壳蛋；另４只公鸡Ｆ＿１代母鸡产蓝壳蛋的占５１．４％，产褐壳或白壳蛋的占４８．６％（１：１）。用带有产蓝壳蛋基因的公鸡与Ｆ＿１代产蓝壳蛋的母鸡杂交，Ｆ＿２代母鸡产蓝壳蛋和非蓝壳蛋的分别为７６．７％和２３．３％（３：１）。Ｆ＿１，Ｆ＿２代均符合单基因分离组合的遗传规律，并对褐壳蛋呈显性遗传。

Six roosters of the breed of Jiuyuan Black Fowl expected to produce blue eggshells were testcrossed with hens of the breed of Ross Brown.The F_1 hens of two roosters all laid either brown or white eggs,The F_1 hens of the other four roosters laid eggs with blue eggshell and brown or whiteeggshell at a ratio of approximately 1:1,being 51.4%.and 48.6%of the total,respectively. Theblue egg laying F_1 hens were then backcrossed with two roosters carrying the blue egg laying gene,and 69 hens were obtained,of which 76.7%laid blue eggs and 23.3%laid non-blue eggs,at aratio of 3 :1.Chi-spuare tests from F _1 and F_2 showed that the distribution of the character ofeggshell is consistent with Mendel’ s Assortment Law for single gene conditioned characters andbrown eggshell is dominant.