MATERNAL EFFECTS ON EXPRESSION OF LETHALITY IN THE CREEPER CHICKEN

概要

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Homozygous Cp/Cp embryos produced by the Cp (WL-G) strain all die by the 10th day of incubation. Expression of the lethal action of the CP gene was examined in crosses of various breeds with the Cp (WL-G) strain. The F1 heterozygous Cp/+chickens obtained by crossing the Nagoya and Silkie breeds with the CP (WL-G) strain produced high percentages of viable homozygous CP/CP embryos. However, crosses of the Brown Leghorn, Black Minorca, and New Hampshire with the Cp (WL-G) strain did not produce homozygous CP/CP embryos.The Cp (NG-A) and Cp (NG-N) strains produce viable homozygous Cp/Cp embryos. Two reciprocal crosses of these strains with the CP (WL-G) strain showed different percentages of viable Cp/Cp embryos, indicating that expression of the Cp gene depended on the maternal genetic constitution. Results on two reciprocal crosses of the NG-N strain with the Cp (WL-G) strain suggested that the maternal genetic constitution appearing in viable homozygous Cp/Cp embryos was brought about by dominant and autosomal genes. Expression of the Cp gene also depended on the period of egg laying, suggesting that some substance(s) lowering the lethal action of the Cp gene was introduced into the cytoplasm of the eggs by the mother hens.
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