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At least 289 records · Page 16Linked to original sources
PubMed1980

On the pituitary gland and reproductive cycle of Indian fresh water goby, Glossogobius giuris (Ham.) II. Seasonal changes in the proximal pars distalis and their correlation with the reproductive cycle.

The cells of pars-intermedia and rostal pars distalis in the pituitary gland of Glossogobius giuris (Ham.) do not exhibit marked cytological variations. The Basophil I (gonadotrope) of the proximal pars distalis are found to show prominent organisational changes in respect of various gonadal activities and water temperature. The process of granulation and degranulation in these basophils closely follow the process of maturation of the gonads and spawning of the fish. The release of hormones as evinced by the process of degranulation of the basophils during the spawning period (June to September) results in the evacuation of the gonads.

Animals↗
PubMedDate not supplied

[The characteristics of the reproductive capacity of hybrids of the bison (Bison bison L.) with the domestic cow (Bos (Bos) primigenius taurus). 1. The reproductive capacity of hybrid males].

The hybrid progeny F1 produced by intergeneric crosses of a bison with a domestic cow is characterized by absolute sterility of the male line and fertility of the female line. Crossing of females with fertile males of initial forms permits us to obtain fertile males in the following generations. Any differences in stabilization of spermatogenesis in hybrid males obtained from various crosses and under selection of parental couples were not detected.

Animals↗
PubMed1999

Effects of exogenous 17(&bgr;)-estradiol on the reproductive physiology and reproductive performance of european starlings (Sturnus vulgaris)

Egg mass shows large intraspecific variation in birds and yet the mechanisms underlying this variation remain unknown. We hypothesized that estradiol would play a central role in determining egg mass, since this hormone stimulates the production of yolk precursors (vitellogenin and very-low density lipoprotein, VLDL) by the liver, and of albumen by the oviduct. We gave European starlings (Sturnus vulgaris) silastic implants containing estradiol prior to egg formation, which we predicted would increase egg mass. As expected, exogenous estradiol stimulated a marked (49 %) increase in plasma vitellogenin levels at the beginning of laying. At clutch completion, plasma VLDL levels and oviduct mass were also elevated in estradiol-treated females compared with controls. However, estradiol had no effect on fresh egg mass or clutch size. Estradiol treatment actually decreased the mass of yolk protein and lipid, perhaps by decreasing the rate of uptake of yolk precursors at the ovary. The failure of estradiol to increase egg mass indicates that this phenotype may be regulated at higher levels of organization (e.g. negative feedback, uptake of yolk precursors) than those studied in this experiment. Despite elevating yolk precursor levels, treatment with estradiol had no effect on the mass of the liver or endogenous stores of protein and lipid at clutch completion.

Journal Article↗
PubMed1988

Reproductive health and reproductive freedom: maternal health care and family planning in the Swedish health system.

Health care for mothers and children has been a cornerstone of the Swedish system of health care for many years, starting in the 1930s, when a national network of maternal health centers offered a variety of free prenatal services. This paper describes modern maternal health services whose primary goal is preventive care. Instruments for attaining this goal are regular check-ups for early detection of problems and for maintenance of good health; social and psychological support to expectant parents; information and training to prepare parents for delivery and parenting; information and education about risk factors in the parents' local environment and in society in general. Details of how these programs were developed, delivered and evaluated are provided by the author, a former Senior Medical Officer at the National Board of Health and Welfare, responsible for maternal health care and family planning on a national level.

Abortion, Legal↗