Chemosensory cues, particularly those emanating from substrate areas occupied by previously hatched young, may play an important role in the reproductive behavior of lake trout Salvelinus namaycush. Support for this hypothesis was obtained in laboratory experiments. Adults were placed in a large circular pool with four experimental reefs. Egg membranes and feces obtained from young that had hat...

BACKGROUND This paper aims to examine the reproductive health and behaviors which might expose young people at risks of STIs/HIV and potential correlates of such behaviors among female college students in Tehran. METHODS This paper focuses on the study conducted on a sample of 1743 female undergraduate students in four multidisciplinary universities in Tehran during 2005- 2006 using a two-sta...

Although recent studies have identified some of the links in Latin America between uneven capitalist economic development and health, the impact of development on either the health of women or on household health is still largely unknown. This account identifies several areas of needed research. It focuses on how changing women's roles and patterns of domestic production affect women's reproduc...

Over the past four decades reproductive behavior has changed rapidly in much of the developing world. The average total fertility rate (TFR) has fallen by half from the tradit ional six or more to near three today, and contraceptive use – once rare – is now widespread. Between the early 1960s and the late 1990s the largest fertility declines occurred in Asia (52 per cent) and Latin America (-55...

CONTEXT Differences among developed countries in teenagers' patterns of sexual and reproductive behavior may partly reflect differences in the extent of disadvantage. However, to date, this potential contribution has received little attention. METHODS Researchers in Canada, France, Great Britain, Sweden and the United States used the most current survey and other data to study adolescent sexu...

A high reproductive potential is one reason for the rapid spread of Drosophila suzukii in Europe and in the United States. In order to identify mechanisms that mediate mating and reproduction in D. suzukii we studied the fly's reproductive behavior, diurnal mating activity and sexual maturation. Furthermore, we studied the change of female cuticular hydrocarbons (CHCs) with age and conducted a ...

ten male merghoz goats with initial live weights of 29.2 ± 1.2 kg (mean±se) were used to investigate the effect of natural changes in photoperiod on dry matter intake (dmi) and reproductive activity during a 365 day study. the bucks were housed in individual pens, under natural daylength condition at west of iran, kermanshah (34˚ 18¢n and 47˚ 3¢e and 1420 m above sea level). a diet was offered ...

The reproductive behavior of semi-wild and feral horses is described briefly in order to provide a background on the reproductive patterns and the specific behavioral elements comprising courtship and mating in the horse. The reproductive behavior of the domestic stallion is discussed at length as are various breeding conditions and normal breeding performance. Finally, sexual behavior problems...