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[F-3.3 Trend analysis of inbreeding depression system using inbreeding line of Japanese quail (Final Report)]

[Contact Person]

Akira Shimizu
Senior Researcher, Social and Environmental System Division
National Institute for Environmental Studies, Environment Agency
16-2 Onogawa, Tsukuba, Ibaraki 305-0053 Japan
Tel:+81-298-50-2452 Fax:+81-298-51-4732
E-mail:ashimizu@nies.go.jp

[Total Budget for FY1996-FY1997]

8,322,000 Yen (FY1997;4,968,000 Yen)

[Abstract]

To save the endemic, rare or endangered species of wild animals, it is essential to exploit an inbred strain of experimental animal. In the Japanese quail (Coturnix japonica) selected for high (H2) or low (L2) antibody production to Newcastle disease virus (NDV) , a trend analysis about inbreeding depression was carried out by their reproduction record over 50 generations.

As a result, the reproductive traits of H₂ and L₂ quails changed as follows: 1) There was no trend in the egg fertility and pipping death rate throughout 50 generations, 2)The hatchability declined with the progress of generation, 3)However, the hatchability of L₂ quails was improved after the crisis of bottle neck effect happened at 43rd generation.

After crossbreeding of H2 and L2 lines, the heterosis effect appeared in the hatchability. As this heterosis recognized only few pairs, the nicking between sire and dam might be important in the inbred lines.

By means of artificial insemination, we succeeded in freezing of quail's sperm in a medium. Therefore, it is possible to get fertile eggs from the Japanese quail in accordance with chicken's method.

These analysis of those inbred Japanese quails would be useful to clarify the mechanism of inbreeding depression for rare avian species.

[Key Words]

Inbreeding Depression, Japanese Quail, Extinction Model, Analysis