Annual plants grow vegetatively at early developmental stages and then transition to the reproductive stage, followed by senescence in the same year. In contrast, after successive years of vegetative growth at early ages, woody perennial shoot meristems begin repeated transitions between vegetative and reproductive growth at sexual maturity. However, it is unknown how these repeated transitions...

In other to study the effects of salicylic acid on reproductive characters of ‘Elberta’ Peach (Prunus persica L. Batsch) tree, an experiment was carried out based on randomized complete blocks design with four replications in commercial orchard, Kerman, Iran. The application of three concentrations of salicylic acid 0 (control), 1and 2 mM at swollen bud stage were used. Results showed that appl...

1. Growth 1.1 Early Embryonic Growth 1.2 Embryonic Origin of Various Organ Systems 1.3 Description of Tissue Types 1.4 Growth in Meat Producing Animals 1.5 Regulation of Growth 1.6. Adipose Tissue Growth 1.7 Factors that Reduce Growth 2. Reproductive Physiology 2.1 Male Reproductive System 2.2 Hormonal control of Spermatogenesis and Male Reproduction 2.3 Female Reproduction. 2.4 Mating and Fert...

In studies done a decade apart, we provide evidence of a recent shift toward a slower progression to sexual maturity as well as reduced egg production, especially among young, small female red snapper, in the Gulf of Mexico (Gulf). Slower maturation rates (among fish ≤6 years old), lower GSI values and decreased spawning frequency were observed, and were especially pronounced in the northwester...

The standard model of population growth and regulation is critiqued. It is argued that any model of population growth and regulation must accommodate ten propositions, and a multitrajectory model that does so is described. This model identifies competition between groups, individual choice in reproductive behavior, the scale for spatial and temporal variation in resource abundance, and the soci...

That men figure in a list of the “hardly reached” in reproductive health (RH) testifies to the complex history and politics of this field. It is true that RH services have tended to overlook men and concentrate their efforts on women. Yet family planning (FP) services were often delivered in an expedient manner, not to serve women’s needs, but to reduce population growth. The field’s traditiona...

In tilapia, growth during critical periods of the life cycle varies at different ages of development and is influenced by sexual maturation. The mechanisms controlling gametogenesis and how growth affects this process are poorly understood. This study indicates that tilapia exhibit a sexually dimorphic growth pattern in which males grow faster and bigger than females. During critical periods of...

Although the Programme of Action of the International Conference on Population and Development (ICPD) does not contain as a specific goal to reduce hunger, many of its elements should make a major contribution toward attainment of the Millennium Development Goal on hunger. Several of the Actions called for by the ICPD are essential to the reduction of hunger, especially those related to gender ...

In polygynous species, variance in reproductive success is higher in males than females. There is consequently stronger selection for competitive traits in males and early growth can have a greater influence on later fitness in males than in females. As yet, little is known about sex differences in the effect of early growth on subsequent breeding success in species where variance in reproducti...

This study was carried out in a clonal seed orchard of scots pine (Pinus sylvestris L.), to determine the difference and interaction for reproductive and growth characters among clones and its impact on fertility variation and gene diversity Numbers of female and male strobili, and height and diameter at breast height were studied on six grafts chosen randomly in each of the 27 clones for the p...