The name of the 30th president of the USA, Calvin Coolidge (1872–1933), has become intimately linked to the reproduction of farmyard chickens (Gallus gallus domesticus), and of other vertebrates. Legend has it that during a visit to a farm, Mrs Coolidge became interested in the question how frequently a rooster can copulate, whereupon the president established that the dominant male will deligh...

1 Vincent Center for Reproductive Biology, MGH Vincent Department of Obstetrics and Gynecology, Massachusetts General Hospital, Boston, Massachusetts, United States of America, 2 Department of Obstetrics, Gynecology and Reproductive Biology, Harvard Medical School, Boston, Massachusetts, United States of America, 3 Institute of Cell Biology and Centre for Integrative Physiology, University of E...

From the *Division of Reproductive Biology, The Johns Hopkins University School of Hygiene and Public Health, Baltimore, Maryland; jDepartment of Obstetrics/Gynecology, University of Colorado Health Sciences Center, Denver, Colorado; .JDepartment of Biochemistry, Washington State University, Pullman, Washington; §Department of Physiology, Laboratory of Structural Biology, Southern Illinois Univ...

This work presents a relationship between environmental conditions and reproductive performance in modern humans. Birth rates and sex ratio (SRB) at birth were analyzed from large data scales. The results include data from people working or living under different job respectively socio-economic conditions, such as employees working in the academic field, employees under supervisory or hire and ...

ter "The Development of In Vitro Fertilization from Laboratory Animals to Humans," by M.C. Chang, the pioneer in the field, is very interesting from both its historical standpoint and the fact that it is a fine dissertation on comparative reproductive physiology. It points out pertinent applications of animal and laboratory work to human work. The chapter by Lopata and Wood entitled "In Vitro F...

Sex-ratio distorters are found in numerous species and can reach high frequencies within populations. Here, we address the compelling, but poorly tested, hypothesis that the sex ratio bias caused by such elements profoundly alters their host's mating system. We compare aspects of female and male reproductive biology between island populations of the butterfly Hypolimnas bolina that show varying...

Herein we present new occurrences of sites of Dendropsophus minusculus in Brazil adding information about reproductive biology and colour patterns of the species. Such information is fundamental for characterising the species that we believe has been neglected due to its morphological similarity with other congeneric species. Dendropsophus minusculus may be found in different morphoclimatic dom...

Background: Rodents with short reproductive cycle length are the best model for investigation of physiology and molecular aspects of reproductive biology. This study aimed to establish a correlation between histological changes of uterus and ovaries with the vaginal smear. Materials and Methods: 6-8 weeks old virgin Female NMRI mice were submitted to the vaginal smear collection and observed us...

The impact of deer overabundance is a worldwide problem. Along with habitat expansion and population increase, damage by sika deer to the forest ecosystem and agriculture has become a serious issue in Japan. Deer also transmit a number of diseases and parasites to humans and livestock. The overabundance of deer is a result of their strong fecundity, and therefore the present situation should, i...