During the course of study, a comparision was established of changes in breeding season of concentration of three pairs of paired cranes′ reproductive hormone with the method of RIA.

The blood biochemical indices and its changes about calcium (Ca), alkaline phosphtase (AKP), glutamic pyruvic transaminase (GPT), total protein (TP), albumin (A), globulin (G) and total cholesterol (TCH) of red crowned cranes in breeding season were studied and analysed.

The aim of this study is to determine the ovulation duration of domestic cats after superovulation during their non-breeding seasons.

In order to overcome seasonal bondage of reproduction in meat goose breeders,and meet the demand of goslings and commercial meat goose in whole year,covering light goose-house,controlling illumination time,limiting raise program and exchanging feather of manpower force were used to realize reproduction in non-breeding season to change the conventional seasonal reproduction mode in breeding goose.

To study the regulation of photoperiod on seasonal reproduction and the associated endocrine mechanisms in Magang geese,adult breeding geese and ganders were exposed to natural photoperiod(controls),or subjected to an artificial program of long and short photoperiods(experimental birds).