Male infertility is an urgent medical and demographic threat worldwide, in particular industrial regions suffering from environmental pollution. Here we performed analysis of epidemiological studies meta-analyses prevalence, causes, risk factors male reproductive disorders. Among the well-defined determining are hormonal imbalance, sexually transmitted infections, other inflammatory diseases, h...

Fertility rates vary across countries. Pooled data on more than 100 countries over the period 1955-85 are used to estimate a model of fertility behavior. The author found the impact of socioeconomic factors to differ across different age cohorts such that the negative impact of improvements in female status upon fertility rates is higher among the younger age cohorts. Cross-country differenc...

Introduction: Over the past few decades, we have seen a major decline in fertility in Iran and in the world. A wide range of social, economic and personality factors, including delayed marriage, fertility behavior, educational and economic goals have affected fertility intent. The rational action theory that determines the relationship among attitude, intent and behavior can be used to explain ...

Every country has a desire to balance its population growth according to its socioeconomic conditions. Three major components affecting population growth are fertility, mortality and migration, and among these components, fertility plays the most important role. A number of factors such as social, cultural, economic, health and other environmental factors directly determine fertility. Davis and...

Much of Africa has yet to go through a demographic transition; this Malthusian crisis of high mortality, high fertility, rapid population growth and chronic extreme poverty has been attributed to factors including the status of women, pro-natalist policies, and poverty itself. Large uncertainty exists among demographers as to the relative importance of these factors, mostly since econometric es...

Introduction Fertility is a very complex trait, difficult to define, to record and to evaluate all the factors that influence fertility. Fertility is strongly influenced by environmental effects and in part by genetics, the male for fertilization and the female for conception. In general, the fertility trait is hereditary but only to a small degree. There does however exist sufficient genetic v...

This is an endeavor to study the plausible causal socio-cultural variable and biological pathways influencing human fertility among the remotely located primitive tribal community of Orissa. The present paper deals with the fertility of 156 Mankirdia women. Efforts are made to study the biological determinants and societal factors affecting fertility. The observation of fertility gives an impre...

Introduction It is now widely recognised that reduced fertility in dairy herds is one of the most important factors affecting producer profitability. Roche (2006) has defined the effect of infertility on profitability as: (i) prolonged calving interval with fewer calves and less milk per cow; (ii) increased replacement costs; (iii) increased labour, semen and veterinary bills; and (iv) an exten...

Behaviors related to fertility constitute primary candidates for investigating the relevance of evolutionary influences and biological dispositions on contemporary human behaviors. Using female Danish twin cohorts born 1870-1968, we document important transformations in the relative contributions of "nurture" and "nature" to within-cohort variations in early and complete fertility, and we point...