A special issue on the interface between cognition and care for animals in captive settings. Within the special issue are papers examining different aspects of cognitive tasks as possible outlets for different terrestrial animals often found in captive settings such as zoological facilities and laboratories.

BACKGROUND AND OBJECTIVE To date, most parent-based research has neglected the role of fathers in shaping adolescent sexual behavior and has focused on mothers. The objective of this study was to conduct a structured review to assess the role of paternal influence on adolescent sexual behavior and to assess the methodological quality of the paternal influence literature related to adolescent se...

For many thousands of years, at different times and in different parts of the world, humans have studied their fellow creatures in an attempt to obtain a better understanding of their behavior. Toward the end of the eighteenth century, an increasing amount of observational – and occasionally experimental – research on behavior took place in Western Europe. Nonetheless, the foundations of the co...

Mixing of unfamiliar pigs is a standard management procedure in commercial pig production and is often associated with a period of intense and physically damaging aggression. Aggression is considered a problem for animal welfare and production. The objective of the present paper was to investigate the genetic background of aggressive behavior traits at mixing of unfamiliar gilts under 2 differe...

to the most stolid and concrete, show similar patterns. J. Hajnal adduces indications that, in the early modern age, the population patterns of western Europe departed decisively from those prevalent elsewhere. Marriage ages rose to medians fully five andten years later than those found in other parts of the world and in Europe itself before the seventeenth century. Unparalleled proportions of ...

Impulsive-compulsive sexual behavior is a little studied clinical phenomenon which affects approximately 5% to 6% of the population. In the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition-Text Revision, it is classified as an impulse control disorder not otherwise specified or a sexual disorder not otherwise specified. It may be placed in a possible new category in the Dia...

conceptualized in a negative and pro blematic context,” with the intent of preventing diseases and unplanned pre gn a n c i e s .5 For these and other re a s o n s , adolescent sexuality is typically conceptualized and studied as a dichotomy: Adolescents have had sex or they have not. H o w e v e r, the dichotomous sex–no sex view does not take into account the psychological and social context ...

The mare is seasonally polyestrus, having an anovulatory period during the short light days of late fall and early winter, and beginning to ovulate as the days become longer during the winter. The complete estrus cycle is typically about 3 weeks, with 5 to 7 days of estrus and approximately 2 weeks of diestrus. When a mare lives within the natural social structure of the horse, i.e. a family ba...