The eastern shovelnose ray (Aptychotrema rostrata) is a medium-sized coastal batoid endemic to the coast of Australia. It most common elasmobranch incidentally caught in Queensland east otter trawl fishery, Australia’s largest penaeid-trawl fishery. Despite this, age and growth studies on this species are lacking. present study estimated parameters age-at-maturity for A. rostrata basis sampling...

This paper shows new evidence of a steady long-term decline in age of male sexual maturity since at least the mid-eighteenth century. A method for measuring the timing of male maturity is developed based on the age at which male young adult mortality accelerates. The method is applied to mortality data from Sweden, Denmark, Norway, the United Kingdom, and Italy. The secular trend toward earlier...

this study was conducted to investigate direct and maternal effects on some economic traits in north iranian native fowls. traits considered were body weight at 1 day of age (bw1), body weight at 8 weeks of age (bw8), body weight at 12 weeks of age (bw12), egg number (en) during the first 12 weeks of laying period, egg weight at 1st day of laying (ew1), mean egg weight at 28th, 30th and 32nd we...

The research investigated the level of association of ‘Age and Spiritual Maturity’ among the leaders of different age groups. Hypothesis assumed as a base of this research was tested on the data of 100 respondents collected from the leaders at various levels. Research also illuminates how spiritual maturity grows among the leaders as they gain experience and get old aged. During the research it...

the main aim of this research was to estimate the genetic and phenotypic parameters for productive and reproductive traits of esfahan native chickens. traits included body weights at hatch (bw1), 8 weeks of age (bw8), 12 weeks of age (bw12), and at sexual maturity (wsm)], age at sex maturity (asm), egg number (en), average egg weight (aew) in the first 12 weeks of production, and egg production...

Age determination plays a great role in forensic medicine, pediatric endocrinology and is of particular interest in orthodontic and pedodontic treatment planning. The classical and most widely used method for skeletal-age evaluation is the highly reliable hand-wrist bone analysis performed by radiographs. However, this analysis entails exposure to ionizing radiation in addition to the routine r...

It is clinically important to evaluate the level of skeletal maturation in juveniles to determine the appropriate timing for orthodontic treatment. The purpose of this study was to assess the age of bone maturity by using an ultrasonic bone analyzer (Cuba Clinical, McCue Ultrasonics Ltd., Winchester, U.K.), Broadband ultrasonic attenuation (BUA:dB/MHz) was measured at the left calcaneus as an e...

The evolution of the long, slow human life history is a major challenge to evolutionary biologists. A compelling theory states that our late age at maturity allows us to acquire the many skills needed to survive in the economically intensive human foraging niche. Cultural transmission may be a crucial part of this process, by exposing learners to a wealth of information and skills that they wou...