Life History and Spatial Distribution Pattern and Sampling Technique of Calomycterus obconicus in the Mulberry Field in South Shaanxi;

Clinical efficacy of alarelin and human menopausal gonadotropin on small follicle ovulation;

Their expression show tissue specificity, both of them express in mouse ovary, but the expression and physiological functions are different between them.

In the experiment,th e expression and distribution regulation of ERβand p-ERβwere researched on mouse ovary which were chosen from different periods of oestrous cycle.

This article introduces the research in advance in vitro maturation of mammal oocytes derived from small antral follicles,and analysed the factors which influenced in vitro maturation of small antral follicular oocytes such as pick-up methods,culture period,serum,hormones and so on.

Intact goat small antral follicles were dissected from ovaries by a microsurgical method and cultured individually in 24—well tissue culture plate.

Goat ovaries were collected at breediiig and nonbreeding seasons，The oocytes derived from large（LAF，3-6mm）and small antral follicles（SAF，＜2 mm）were recovered and used for matturation and fertilization in vitro, The results are as follows：①in vitro maturation rate of LAF and SAF oocytes is significantly higher at breeding seasons(68．4％，27.