State-dependent decisions in long-term fasting king penguins, Aptenodytes patagonicus, during courtship and incubation

Using an automatic identification and weighing system, we investigated changes in adult body mass in relation to reproductive behaviour during courtship and incubation in free-living king penguins. Despite stressful nutritional conditions and variability of fast length, the majority of pairs incubated successfully by accumulating large body reserves before fasting, which provided flexibility in fasting strategies. […]

Development of guidelines for assessing obesity in captive chimpanzees (Pan troglodytes)

Abstract 10.1002/zoo.20122.abs Many captive chimpanzees (Pan troglodytes) are subjectively considered to be overweight or obese. However, discussions of obesity in chimpanzees are rare in the literature, despite the acknowledged problem. No study to date has systematically examined obesity in captive chimpanzees. This project develops guidelines for defining obesity in captive chimpanzees through the examination of […]

Food consumption and growth of a female dusky dolphin (Lagenorhynchus obscurus)

Abstract 10.1002/1098-2361(2000)19:23.3.CO;2-P Food consumption, body measurements, weight changes, and body temperatures of a female dusky dolphin are presented for the 13 years that she was at Sea World, Durban. Her annual food consumption increased from 1,870 kg at the age of 3 years to 2,170 kg when she was 5 years old. During her sixth […]

Annual rhythm of body weight in Prezwalski horses

The live-weight of female Przewalski horses in a semi-natural reserve has been recorded continuously over 6 years by means of an automatic weighing machine and automatic identification. Data were tested for cyclic as well as for linear trend effects and a mathematical model was developed. A clear annual rhythm of live-weight with the maximum in […]

Behavioral and physiological characterization of male mice under chronic psychosocial stress

Social stress is a major factor in the etiology of several psychopathologies, with individuals greatly differing in vulnerability. The development of appropriate animal models of social stress is, thus, a major challenge of modern bio-medical research. Adult male mice were subjected to a new model of chronic psychosocial stress in which resident/intruder dyads live chronically […]

Effect of a cage divider permitting social stimuli on stress and food intake in rats

The need to obtain data from individual laboratory animals has forced many researchers to singly-house small animals. This is costly to the researcher and isolation can adversely affect animal physiology and behavior which in turn may threaten the validity and generalization of experiment results to humans. We assessed the practical use of a housing device […]

Body weight change as a measure of stress: a practical test

We report on the efficacy of body weight change as a measure of trapping and handling stress in two species of wild small mammal: bank voles (Clethrionomys glareolus) and wood mice (Apodemus sylvaticus). We tested two hypotheses: (1) that weight change after capture and handling is related to the intensity of the trapping and handling […]

Hypertension Increases With Aging and Obesity in Chimpanzees (Pan troglodytes)

Cardiovascular disease is a primary cause of morbidity and mortality in captive chimpanzees. Four years of blood pressure (BP) data were analyzed from a captive former laboratory population of 201 healthy adult chimpanzees with assessment of age and obesity on elevated BP. Five different measures of obesity were compared: abdominal girth, basal metabolic rate, body-mass […]

Testosterone modulates spatial recognition memory in male rats

Abstract A growing body of research indicates that testosterone influences spatial cognition in male rats; however, the overwhelming majority of studies have been conducted on tasks motivated by either food deprivation or water escape. The hippocampus-dependent version of the Y-maze task, which characterizes spatial recognition memory, capitalizes on the propensity of rats to gravitate toward […]

Using Conjoint Analysis to Weight Broiler Welfare Variables Based on Slaughterhouse Data

The Council of the European Union adopted the welfare directive for broiler chickens in 2007 (Commission of the European Communities, 2007). The directive defines minimum demands and objectives for broiler production ranging from stocking density to welfare. This study found that the level of nonhuman animal welfare can be determined, for example, with welfare indexes […]