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PubMed1985

Transition from pup killing to parental behavior in male and virgin female albino rats.

In the first part of this study, the effect of habituation to pups was examined in virgin female and male Sprague-Dawley rats that committed infanticide in a screening test. With repeated exposure to test pups (5-10 days old), the rats ceased to commit infanticide and came to behave parentally. Preexposure to inaccessible pups (confined inside wire-mesh baskets) did not accelerate the rate of disappearance of infanticide during subsequent contact with young, which suggests that pup killing is not a neophobic response to the novelty of young. In the second part of the study, three groups of infanticidal male Wistar rats were mated and tested for their responses towards unrelated pups after different intervals of cohabitation with their mates. The males continued to commit infanticide at the time that their mates were at midpregnancy or 24 hr before parturition, but males that cohabited with their mates till day 9 postpartum no longer attacked the young. Thus, the mother rat, presumably by means of postpartum aggression, renders her mate noninfanticidal, thereby reducing the likelihood of her offspring being harmed when she is away from the nest.

Aggression↗
PubMed1988

Infanticide in rats: male strategy and female counter-strategy.

The present series of experiments addresses the question of whether mating governs infanticide in the male rat and, in addition, asks whether the female rat has available an effective counter-strategy to male infanticide. With regard to the first question, we found that mating provides a safeguard against the killing of own young. That is, mating induces a general inhibition of infanticide coincident with the birth of the male's young and a recrudescence of infanticide synchronized with their weaning. The particular gain realized in killing alien young depends on the age of young and consequently on whether the mother had reached postpartum estrus. We also found that the pregnant female has an effective strategy to counter male infanticide which she employs before the young are born. The data show that this counter-strategy involves the synthesis of a chemosignal of low volatility emitted during pregnancy. The possible role of the male's vomeronasal system in the reception of this chemosignal is discussed.

Aggression↗
PubMed1982

The justification of medical paternalism.

This paper examines the moral justification of medical paternalism. It is shown that while there are sufficient grounds to justify the practice of medical paternalism in some instances, there are many instances of the practice which cannot be justified. The application of the utilization principle of paternalism is considered in detail. It is argued that the physician can justifiably apply the principle in a particular case only after he has determined both that there are no alternate non-paternalistic courses of action which will have the same results and that he is in the same privileged position with respect to any relevant non-medical considerations as he is in with respect to medical considerations. The moral constraints on paternalistic action flowing from the concept of personal autonomy are also examined. It is concluded that medical paternalism is justified only when utilitarian considerations apply and when they do not violate personal rights. This occurs only when the subject of paternalism is not fully competent, when he has explicitly or by implication given consent, or when it can be reasonably concluded, from the knowledge of his emotional and cognitive make up, that he would approve of such treatment. For the most part, only the physician with a more intimate knowledge of his patient than is possible in most modern medical practice is in the position to undertake medical paternalism with moral propriety.

Attitude↗
PubMed1983

Sex differences in prolactin secretion in parental male and female rats.

The present series of experiments report the behavioral and endocrine responses of male and female rats to rat young. In the first experiment, the behavioral responses of intact male and ovariectomized female rats to foster young were measured. While both of these groups exhibited most components of parental behavior after four to six days of exposure to rat young, males failed to build good nests and to crouch over the young. In addition significantly more males killed young than did ovariectomized females. In the second experiment, treatment of male and virgin female rats with a 21-day hormone regimen of estradiol and progesterone stimulated an equally rapid onset of parental behavior in both sexes. Latencies to exhibit parental responses were approx. two days for both males and females. Pup killing was virtually eliminated in males by hormone treatment. Although the behavioral responses of hormone-primed males and females were similar, their prolactin responses to the presentation of rat young differed. Pup presentation stimulated an increase in plasma prolactin content in hormone-primed parental virgin females similar, but not identical, to that found in lactating control rats, while plasma prolactin levels in hormone-primed parental males did not rise in response to the presentation of young. These data indicate that a sex difference in neuroendocrine, but not behavioral, responsiveness to young exists between parental males and females.

Animals↗
PubMed1987

Regulation of prolactin secretion in parental rats: roles of steroid priming and pituitary responsiveness.

Whereas prolactin (PRL) release increases in female rats as a result of stimuli from rat young, parental male rats fail to show a rise in plasma PRL levels in response to pup stimuli. In the present study, we have characterized two aspects of the endocrine control of PRL release in male and female rats in an attempt to account for this sex difference in pup-induced PRL secretion. First, we compared the patterns of PRL secretion throughout a prolonged steroid priming treatment that effectively stimulates the onset of parental responsiveness in both sexes. Second, we measured pituitary responsiveness to a PRL releasing agent (thyrotropin releasing hormone: TRH) in male and female rats that had previously experienced the steroid treatment. We found that in the presence of estradiol alone or soon after the onset of progesterone treatment in the presence of estrogen, female but not male rats displayed afternoon elevations in PRL. We also found that, following steroid treatment, TRH caused significant and comparable elevations in plasma PRL in both sexes. These experiments demonstrate differences in patterns of PRL secretion in male and female rats during the early phase of a steroid priming treatment that induces parental responsiveness, yet comparable pituitary sensitivity to TRH-induced PRL release following this 3 week steroid treatment. These data suggest that sex differences in pup-induced PRL secretion in rats do not result from fundamental differences in endocrine priming or from sex differences in pituitary responsiveness.

Animals↗
PubMed2006

Comparison of behavior modification with and without swaddling as interventions for excessive crying.

OBJECTIVE: To test the hypothesis that swaddling is an effective method to reduce crying, we compared a standardized approach of regularity and stimulus reduction with the same approach supplemented with swaddling. STUDY DESIGN: Healthcare nurses coached 398 excessively crying infants up to 12 weeks of age for 3 months. Outcome measurements were crying as measured by Barr's 24-hour diary and parental perception of crying. RESULTS: Crying decreased by 42% in both groups after the first intervention week. Swaddling had no added benefit in the total group. Young infants (1-7 weeks of age at randomization) benefited significantly more from swaddling as shown by a larger decrease of crying over the total intervention period. Older infants (8-13 weeks of age at randomization) showed a significantly greater decrease in crying when offered the standardized approach without swaddling. The actual difference in crying time was 10 minutes. CONCLUSION: For older babies, swaddling did not bring any benefit when added to regularity and stimuli reduction in baby care, although swaddling was a beneficial supplementation in excessively crying infants <8 weeks of age.

Crying↗
PubMed2005

Effects of stress on parental care are sexually dimorphic in prairie voles.

The effects of stress on parental care are poorly understood, especially in biparental species where males also display care. Data from previous studies in prairie voles, as well as parallels with pair-bonding behavior, suggest the hypothesis that a stressful experience might facilitate parental care in males but not in females. In the present study, male and female prairie voles were exposed to either a 3-min swim stressor or no stressor; 45 min later each animal was tested in a parental care paradigm. Following the parental care test, blood samples were collected and assayed for corticosterone (CORT). After the stressor males, but not females, showed significant changes in parental behavior including significantly more time in kyphosis (arched-back huddling), and a tendency to spend more time licking and grooming pups. In males, CORT levels measured following the parental care test were inversely related to licking and grooming but positively correlated with retrievals. These findings support earlier studies suggesting that the neuroendocrine substrates of parental behavior, as well as the effects of stressors, are sexually dimorphic in this species.

Animals↗
PubMed2004

Social stimuli affect juvenile hormone during breeding in biparental burying beetles (Silphidae: Nicrophorus).

Extended biparental care is rare in insects but provides an excellent opportunity to investigate the interaction between the endocrine system and the physical and social environment in the regulation of this behavior. Burying beetles (Nicrophorus spp.) have facultative biparental care and depend on locating a small vertebrate carcass that they bury and prepare as food for their young. Commonly, both male and female Nicrophorus orbicollis remain in the burial chamber after eggs hatch to feed and guard the larvae. In both sexes, juvenile hormone (JH) rises rapidly in response to the discovery and assessment of the carcass; it returns to near baseline in 24 h; then in females it reaches very high titers at the onset of maternal care. In this paper, we investigate some social (presence of a mate, mating history, larval age) and environmental (carcass size) factors that may affect this endocrine profile. For females, neither the presence of a mate nor mating status (i.e., virginity) affected the initial rise of JH. However, the absence of a mate significantly depressed the JH rise in males. Eighty-seven percent of the single males buried the carcass like paired males but 87% also released pheromones to attract a mate. JH hemolymph titers in females whose broods were replaced every 24 h with newly hatch larvae were significantly higher than those of females rearing aging broods. Lastly, even though larger carcasses took longer to bury and prepare and oviposition was delayed, neither JH titers nor speed of ovarian development was affected by carcass size.

Animals↗
PubMed2004

Immediate early gene expression associated with induction of brooding behavior in Japanese quail.

Certain species can be induced to foster infant or neonatal animals through the process of sensitization. We induced brooding behavior in adult Japanese quail through repeated exposure to foster chicks across five 20-min trials. Brooding behavior was characterized by a bird allowing chicks to approach and remain underneath its wings while assuming a distinctive stationary crouching posture, preening, and feather fluffing. Birds who did not show brooding behavior actively avoided chicks. Among the birds that brooded chicks, females brooded chicks for longer durations compared to males. Brooding females continued a regular daily egg laying pattern; males showed no significant changes in testosterone levels after exposure to chicks. In a second experiment, we measured expression of two immediate early gene (IEG) protein products, ZENK and Fos, to identify the brain regions activated or inhibited by brooding behavior in females. ZENK and Fos expression in brooding or sensitized females (SF) were compared with expression in nonmaternal females with chicks (NMF) and with females without chicks and with blocks as control objects (BL). There was a reduced density of ZENK-like immunoreactive (ZENK-lir) cells in the medial preoptic nucleus (POM) in NMF birds. In SF birds, the density of Fos-like immunoreactive (Fos-lir) cells was elevated in the bed nucleus stria terminalis, medial portion (BSTm), and ectostriatum (E). These experiments begin to define the neural circuitry underlying brooding behavior in Japanese quail, and establish a model for future studies of the neural mechanisms of avian parental behavior.

Animals↗
PubMed2005

Modulation of prolactin but not corticosterone responses to stress in relation to parental effort in a long-lived bird.

We tested the hypothesis that parental effort modulates the magnitude of corticosterone and prolactin responses to stress in a long-lived bird, the Black-legged kittiwake (Rissa tridactyla). To do so, we compared corticosterone and prolactin responses to capture/restraint stress between chick-rearing birds and failed breeders (no parental effort). We predicted that (1) the increase in plasma corticosterone levels in response to stress should be lower in chick-rearing birds, (2) the decrease in plasma prolactin levels in response to stress should be lower in chick-rearing birds, and (3) as both sexes care for the chick, there should be no sex difference in the hormonal response to stress. Baseline plasma corticosterone and prolactin levels were higher in chick-rearing birds and were not influenced by body condition. Failed breeders were in better condition than chick-rearing individuals. Corticosterone response to stress was unaffected by parental effort as both chick-rearing and failed birds exhibited a robust corticosterone increase. Prolactin response to stress was however clearly influenced by parental effort: chick-rearing birds showed a modest 9% prolactin decrease whereas in failed birds prolactin concentrations fell by 41%. Body condition did not influence hormonal responses to stress. When facing stressful condition, breeding kittiwakes attenuate their prolactin response to stress while enhancing their secretion of corticosterone. Increasing corticosterone secretion triggers foraging efforts and diminishes nest attendance whereas an attenuation of prolactin response to stress maintains parental behavior. We suggest that this hormonal mechanism facilitates a flexible time-budget that has been interpreted as a buffer against environmental variability.

Adaptation, Physiological↗
PubMed2003

Changes in plasma corticosterone and adrenocortical response to stress during the breeding cycle in high altitude flycatchers.

Plasma corticosterone levels were monitored in a breeding population of Dusky Flycatchers (Empidonax oberholseri) at Tioga Pass, in the eastern Sierra Nevada. Seasonal changes in baseline plasma corticosterone levels were largely related to changes in reproductive status. Levels in both sexes were highest during the period preceding the female's initiation of a clutch. Females, alone, incubated, but males provided food regularly for their incubating mates. Excepting transient peaks in female corticosterone levels that immediately preceded ovipositions, steep declines in baseline levels of corticosterone in both sexes corresponded to the onset of parental attentiveness. Serial measurements of plasma corticosterone levels over a 1-h period of restraint, indicated that these declines originate at the level of the hypothalamo-pituitary-adrenal response system. Increases in stress-induced plasma corticosterone were significantly greater during the period preceding clutch initiation (prenesting) than during the nesting period (incubation and nestling periods). Despite the changes in corticosterone between prenesting and nesting periods, variability in corticosterone levels during both stages was negatively correlated with body condition (body mass and fat, corrected for size), and level of parental investment. Highest levels of plasma corticosterone were observed in lighter, leaner flycatchers, and during the hours when self-foraging activities were highest; lowest levels were seen in heavier, fatter birds, and those foraging for chicks. This relationship between corticosterone and parental care extended to a small number of accessory males that were acting as helpers at the nest. These results suggest that variation in the length of the reproductive cycle and degree of parental investment may help to explain the level of adaptive modulation of the adrenal stress response in species that breed in unpredictable environments.

Adaptation, Physiological↗
PubMed2003

Correlation between plasma steroids and chick visits by nonbreeding adult Nazca boobies.

Nonbreeding adult Nazca boobies (Sula granti) often approach unattended chicks and perform parental and/or aggressive behaviors toward the chicks. Earlier descriptions of these encounters included sexual behaviors as well. We studied hormonal correlates of chick visits by such nonbreeding boobies during the breeding season. We compared the hormonal status of chick-visiting adults with that of nonvisiting adults in the colony. We determined levels of corticosterone (CORT), testosterone (T), androstendione, dihydrotestosterone, and estradiol as potential candidate hormones controlling parental, aggressive, or sexual behavior. Only T and CORT differed between chick-visiting and nonvisiting adults. Chick-visiting adults had higher CORT levels after the interaction than nonvisiting adults randomly caught in the colony. To the contrary. T levels after interactions were lower in chick-visiting compared to random nonvisiting adults. T levels, however, did not vary with level of aggression among chick-visiting adults. We suggest that chick-visiting behavior may be permitted by low T levels and activated by, or resulting in, high CORT levels.

Aggression↗
PubMed1998

A longitudinal analysis of risk factors for child maltreatment: findings of a 17-year prospective study of officially recorded and self-reported child abuse and neglect.

OBJECTIVE: To identify demographic, family, parent, and child factors prospectively associated with risk for child abuse and neglect among families in the community, using data on child maltreatment obtained from both official records and youth self-reports. METHOD: Surveys assessing demographic variables, family relationships, parental behavior, and characteristics of parents and children were administered to a representative sample of 644 families in upstate New York on four occasions between 1975 and 1992. Data on child abuse and neglect were obtained from New York State records and retrospective self-report instruments administered when youths were > or = 18 years old. RESULTS: Logistic regression analyses indicated that different patterns of risk factors predicted the occurrence of physical abuse, sexual abuse, and neglect, although maternal youth and maternal sociopathy predicted the occurrence of all three forms of child maltreatment. In addition, the prevalence of child abuse or neglect increased from 3% when no risk factors were present to 24% when > or = 4 risk factors were present. State records and self-reports of child maltreatment did not correspond in most cases when maltreatment was reported through at least one data source, underlining the importance of obtaining data from both official records and self-reports. CONCLUSIONS: Assessment of a number of risk factors may permit health professionals to identify parents and children who are at high risk for child maltreatment, facilitating appropriate implementation of prevention and treatment interventions.

Child↗
PubMed2000

Sex differences in the parental behavior of rodents.

The reproductive strategy of many mammalian species that give birth to altricial young involves intense and prolonged care of their offspring. In most cases, the mother provides all nurturance, but in some cases fathers, older siblings, or unrelated conspecifics participate in parental care. The display of these behaviors by animals other than mothers is affected by numerous factors, including their sex. We herein review the literature on similarities and/or differences between male and female laboratory rodents (rats, mice, voles, gerbils, and hamsters) in their parental responsiveness and discuss how the parental behavior of males and females is influenced by hormones, developmental processes, and prior social experiences. Understanding the mechanisms that generate sex differences in the parental responsiveness of rodents may indicate how similar sex differences in parental care are generated in other mammals.

Animals↗
PubMed1984

Response of male and female Siberian hamsters towards pups.

The influence of sex, reproductive maturity, and parental experience on the behavior of Siberian hamsters (Phodopus sungorus sungorus) toward strange pups was examined in this study. Immature, mature, or parentally experienced male and female Siberian hamsters were presented with 3- to 8-day-old pups. We recorded pup carrying during the initial 10 min, nesting with pups after 8 or 14 h, and attacking pups during the test period. Among inexperienced animals, more mature males attacked pups than did immature males or mature females. Parental experience significantly decreased pup attacks by males and increased nesting with pups by both males and females. Repeated testing did not modify the responses to pups. We conclude that in Siberian hamsters both caretaking and aggressive responses to pups may be shown by immature and mature animals of both sexes. Parental experience resulted in increased caretaking by males and females and decreased aggressive responses by males.

Aggression↗
PubMed2001

Paternalism, patient autonomy, and moral deliberation in the physician-patient relationship. Attitudes among Norwegian physicians.

Sixteen statements on physician attitudes in the physician-patient relationship were presented to a representative sample of Norwegian physicians (N=990). Three moderately correlated theoretical dimensions were identified in a principal component analysis: paternalism, patient autonomy, and moral deliberation. The paternalism scores increased significantly with age, and psychiatrists scored significantly lower than physicians in somatic specialties. Psychiatrists had the highest scores on the patient autonomy dimension, whereas surgeons scored the lowest. Moral deliberation scores increased slightly with age. To explore the pattern of scores across the three dimensions, the scores were dichotomized and combined in eight different ways. The resulting typology included five different physician profiles: (1) classical paternalists (high scores on paternalism, low scores on both patient autonomy and moral deliberation), (2) modern paternalists (high scores on both paternalism and deliberation, low scores on patient autonomy), (3) autonomists ( high scores on patient autonomy, low scores on both paternalism and deliberation), (4) deliberationists (high scores on deliberation and patient autonomy, low scores on paternalism), and (5) ambivalents (high or low scores on all dimensions, or high or low scores on both paternalism and patient autonomy). The four groups of physicians with 'consistent' attitudes contained between 12 and 19% of the total sample, whereas 37% belonged to the 'ambivalent' group. Laboratory doctors and surgeons belonged significantly more often in the group of classical paternalists than did general practitioners, whereas male physicians were more often modern paternalists than were female physicians. Among the autonomists, women were more numerous than men, doctors in their 40s clearly more numerous than those in their 60s, and psychiatrists clearly more numerous than residents.

Adult↗
PubMed2003

Photoperiod affects the expression of sex and species differences in leukocyte number and leukocyte trafficking in congeneric hamsters.

Sex differences in immune function are well documented. These sex differences may be modulated by social and environmental factors. Individuals of polygynous species generally exhibit more pronounced sex differences in immune parameters than individuals of monogamous species, often displaying an energetic trade-off between enhanced immunity and high mating success. During winter, animals contend with environmental conditions (e.g. low temperatures and decreased food availability) that evoke energetic-stress responses; many mammals restrict reproduction in response to photoperiod as part of an annual winter coping strategy. To test the hypothesis that extant sex and species differences in immune surveillance may be modulated by photoperiod, we examined leukocyte numbers in males and females of two closely related hamster species (Phodopus). As predicted, uniparental P. sungorus exhibited a robust sex difference, with total white blood cells, total lymphocytes, T cells, and B cells higher in females than males, during long days when reproduction occurs, but not during short days when reproduction usually stops. In contrast, biparental male and female P. campbelli exhibited comparable leukocyte numbers during both long and short days. To study sex differences in stress responses, we also examined immune cell trafficking in response to an acute (2 h) restraint stressor. During stressful challenges, it appears beneficial for immune cells to exit the blood and move to primary immune defense areas such as the skin, in preparation for potential injury or infection. Acute stress moved lymphocytes and monocytes out of the blood in all animals. Blood cortisol concentrations were increased in P. sungorus females compared to males at baseline (52%) and in response to restraint stress (38%), but only in long days. P. campbelli males and females exhibited comparable blood cortisol and stress responses during both long and short days. Our results suggest that interactions among social factors and the environment play a significant role in modulating sex and seasonal alterations in leukocyte numbers and stress responses.

Animals↗
PubMed2003

Potential mechanisms of avian sex manipulation.

The aim of this review is to consider the potential mechanisms birds may use to manipulate the sex of their progeny, and the possible role played by maternal hormones. Over the past few years there has been a surge of reports documenting the ability of birds to overcome the rigid process of chromosomal sex determination. However, while many of these studies leave us in little doubt that mechanisms allowing birds to achieve this feat do exist, we are only left with tantalizing suggestions as to what the precise mechanism or mechanisms may be. The quest to elucidate them is made no easier by the fact that a variety of environmental conditions have been invoked in relation to sex manipulation, and there is no reason to assume that any particular mechanism is conserved among the vast diversity of species that can achieve it. In fact, a number of intriguing proposals have been put forward. We begin by briefly reviewing some of the most recent examples of this phenomenon before highlighting some of the more plausible mechanisms, drawing on recent work from a variety of taxa. In birds, females are the heterogametic sex and so non-Mendelian segregation of the sex chromosomes could conceivably be under maternal control. Another suggestion is that follicles that ultimately give rise to males and females grow at different rates. Alternatively, the female might selectively abort embryos or 'dump lay' eggs of a particular sex, deny certain ova a chance of ovulation, fertilization or zygote formation, or selectively provision eggs so that there is sex-specific embryonic mortality. The ideas outlined in this review provide good starting points for testing the hypotheses both experimentally (behaviourally and physiologically) and theoretically.

Animals↗