フクロウの生態に関する知見と人工飼育による孵化について

抄録

1. In 1971, Niigata Prefecture constructed a wildlife protection center, which includes pheasant raising and bird hospital. By April, 1974, 250 wounded or unhealthy birds of 52 species were treated and 18 of them were Ural Owls Strix uralensis, of which 6 were wounded (by car or shot) and 12 were nestlings fallen down from the nest.
2. This paper reports on Ural Owls about the treatment of wounds, cages (3.3m² for wounded and 6.6m² for recovered birds), food, artificial raising of chicks and hatching of eggs laid by protected birds. Also, their vocalization is described.
3. In March to April 1973, one of the protected owls (No. A) laid 5 eggs on the ground which were broken and confirmed to be unfertile after 21 days of incubation.
4. A fallen chick (No. D) picked up on 6 June 1972, laid 2 eggs, at 10 month old, on 27 March, 2 April, 1973 and one egg on 31 March 1974.
5. A wounded bird (No. F) protected on 25 March 1973, was kept with No. A from October and No. A laid 4 eggs on 14, 17, 21, 23 March 1974, of which 2 chicks hatched by artificial incubator. But they died on the 3rd and 6th days after hatching. After taking their own eggs (for artificial incubation), 4 chicken eggs were given which No. A incubated until 3 chicks hatched, but these were eaten by owls during that night.
6. All of D, H. and I chicks first uttered characteristic song at 8 month old after hatching.