To determine the effects of age, sex and housing on trabecular bone volume, samples were collected from groups of male and female domestic fowl housed in cages or floor pens from four to 60 weeks old. Between 25 and 60 weeks old, trabecular bone volume decreased by 25 per cent in sections...
We recommend translocating older females (≥ 6 years old) because they do not have the reproductive delay and low ORRs of juveniles (< 4 years old), nor the higher rates of recruitment failure of juveniles and young adults (4–5.9 years old). Where translocation of juveniles is necessary,...
stagnalis are largely determined by age and size but not by having received seminal fluid. This mating pattern, however, does not fully support the size-advantage model because large or old individuals did not perform better as females in our experiment. These results imply a conflicting mating ...
Previous work has shown that male sorghum plant bugs, Stenotus rubrovittatus (Matsumura) (Heteroptera: Miridae), are more attracted to young virgin females than to old virgin females and are not attracted to mated females. Therefore, we examined the effects of age and mating status on female ...
of performance with five tests representing four components of physical fitness in a large sample of 108,295 eight-year old third-graders. Within this single prepubertal year of life and irrespective of the test, performance increased linearly with chronological age, and boys outperformed girls to ...
Results included the following: (1) girls played longer than boys with feminine and neutral toys, while boys played longer than girls with masculine toys; (2) there was a linear increase with age in the length of time both sexes played with feminine toys, but no age differences were found...
Even though chinchillas have been farmed for a century, there are not many studies concerning their behaviour in captivity or their optimal housing conditions, both of which are important factors in the assessment of their welfare. This study aimed to evaluate the effect of different cage types on...
The ability to perform a specific function is the essence of health in old age [4]. The World Health Organization (WHO) defined healthy aging in 2015 as obtaining and preserving the functional abilities that enable older persons to achieve well-being, underscoring the importance of functional abi...
Supernumerary sex chromosome aneuploidies (sSCA) are characterized by the presence of one or more additional sex chromosomes in an individual’s karyotype; they affect around 1 in 400 individuals. Although there is high variability, each sSCA subtype has a characteristic set of cognitive and physical...
The effect of old age on mitotic activity was not studied, since colon epithelium from old (30 mo) conventional mice could not be maintained in culture. Colon explants from conventional mice that had been pretreated for 32 weeks with weekly doses of a carcinogen, 1,2-dimethylhydrazine, ...