Reproductive and menstrual characteristics, as well as high circulating estrogen concentrations, are associated with risk of hormone-related cancers in postmenopausal women. To explore possible etiologic relationships between menstrual/reproductive characteristics and risk of hormone-related cancers, we examined associations between menstrual/reproductive factors and serum concentrations of fre...

Purebred Hampshire, Duroc and crossbred (H x D, D x H) boars were studied to evaluate reproductive characteristics. One hundred seventeen boars were castrated at 7Y:! months of age to evaluate testicular weights and sperm numbers. Seventy-eight additional boars were studied to evaluate conception rate and embryo numbers when mated to Yorkshire gilts. Rate of gain and backfat probe were also ava...

Data from women who enrolled between 1935 and 1939 in a long-term prospective study of menstrual and reproductive health, in which menstrual cycles and other events were recorded as they occurred, were analyzed to examine factors associated with age at natural menopause. Analysis was restricted to 561 women who enrolled before age 25 years and recorded data through at least age 44 years. Women ...

GENERAL REPRODUCTIVE TRAITS The Brahman is a Bos indicus breed which was developed in the Gulf Coast states of the United States (Phillips, 1963; Yturria, 1973). The adaptive traits which specifically suit the Brahman and Brahman based breeds for production in temperate, subtropical or tropical areas include: tolerance of internal and external parasites; tolerance of high solar energy, ambient ...

OBJECTIVE Our purpose was to examine the associations between demographics and reproductive characteristics on the occurrence of intimate partner violence (IPV) in young women. STUDY DESIGN An anonymous questionnaire was completed by 727 women between 14 and 26 years old who were seen in the family planning clinics in southeast Texas between March 1997 and February 1998 and who reported a cur...

............................................................................................................................ i ACKNOWLEDGESMENTS .................................................................................................................... ii LIST OF TABLES...................................................................................................................v L...

Sexual reproduction strategies vary both between and within species in the level of investment in offspring. Life-history theories suggest that the rate of sexual maturation is critically linked to reproductive strategy, with high investment being associated with few offspring and delayed maturation. For humans, age of puberty and age of first sex are two developmental milestones that have been...

Understanding female reproductive characteristics is important for assessing fertility, interpreting female behavior, and designing appropriate conservation and captive management plans. In primate species lacking morphological signs of receptivity, such as most colobines, determination of reproductive parameters depends on the analysis of reproductive hormones. Here, we use fecal hormone analy...