| Summary: | The performance of naked neck fowl is the expression of Na gene that has an indirect effect to the tolerance of environmental heat. Furthermore, this condition will affect its
physiological, productivity and reproduction capacity. However, its scarcity in the population of native chicken is a problem in the expansion of this species. It is necessary to study the mortality level of this species particularly on the embryonal phase and in the early of his life relate to its genotype. The material consisted of 20 mature naked neck and 8 normal chicken, embryos and the offsprings of crossbred between naked neck and normal chicken. The variables observed were fertility, hatching capacity, hatching quality, embryonic mortality, and weekly weight of crossbred chicken. The data were subjected to descriptive analysis, variance analysis and chi-square test for genotype distribution analysis. The results showed that fertility of embryonal and embryonal genotype could be recognized at 13'h day of incubation. At 13" day of hatching period, the chi-square statistic was not significant to prove the violation of Mendelian distribution, but at 15', 18'h day of hatching period and hatching time the chi-square statistic were significant. The higher mortality level of NaNa genotypes embryo than other genotypes were observed since early in the hatching period. This mortality level increased and was significant at 15" day of hatching period. The highest mortality level was at 18th day of hatching period to hatching time (critical
phase II). The mortality level of chicks with NaNa genotype was maintened high until the
end of the study when chickens were 6 weeks old.
Key Words: Genotype, Fertility, Hatchatibility, Embrionic mortality
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