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At least 1,171 records · Page 65Linked to original sources
PubMed2005

Cost of reproduction in a long-lived bird: incubation effort reduces immune function and future reproduction.

Life-history theory predicts that increased current reproductive effort should lead to a fitness cost. This cost of reproduction may be observed as reduced survival or future reproduction, and may be caused by temporal suppression of immune function in stressed or hard-working individuals. In birds, consideration of the costs of incubating eggs has largely been neglected in favour of the costs of brood rearing. We manipulated incubation demand in two breeding seasons (2000 and 2001) in female common eiders (Somateria mollissima) by creating clutches of three and six eggs (natural range 3-6 eggs). The common eider is a long-lived sea-duck where females do not eat during the incubation period. Mass loss increased and immune function (lymphocyte levels and specific antibody response to the non-pathogenic antigens diphtheria and tetanus toxoid) was reduced in females incubating large clutches. The increased incubation effort among females assigned to large incubation demand did not lead to adverse effects on current reproduction or return rate in the next breeding season. However, large incubation demand resulted in long-term fitness costs through reduced fecundity the year after manipulation. Our data show that in eiders, a long-lived species, the cost of high incubation demand is paid in the currency of reduced future fecundity, possibly mediated by reduced immune function.

Analysis of Variance↗
PubMedDate not supplied

Helping patterns and reproductive success in Aymara communities.

"Helpers at the nest," young adults remaining in their parents home to take care of younger siblings, are known in many species of birds and mammals. Similar behaviors are occasionally observed in human societies but their frequency and significance for parental reproductive success are still not fully appraised. This study was designed to document this issue in a traditional Aymara peasant society of the Bolivian Altiplano, It is based on 359 reproductive life histories of women 45 years of age or older and on a survey of children's workload in 1998 and 1999. The presence of "potential helpers" in the household is significantly associated with higher fertility and with improved survival of siblings to sexual maturity. Caretaking is not particularly assigned to older daughters. The positive relationship between the availability of offspring help and reproductive success does not demonstrate a causal role for child caretaking because, in contrast with nonhuman helpers, workloads of children range from housekeeping to agricultural tasks, instead of being focused on feeding or protecting younger siblings. Correlation and multiple regression analyses, however, suggest that the total amount of care given by the older offspring and the amount of care received by each recipient are, along with offspring contribution to household economy, among the determinants of parental reproductive success.

Adult↗
PubMed1988

Timing of puberty by photoperiod.

Photoperiod cues play an important role in the timing of puberty in the female lamb. Removal and replacement of photoperiod cues by denervation of the pineal gland and timed melatonin infusions, respectively, indicate that the pathway for transmission of photoperiod information develops well before puberty. This is reinforced by manipulation of artificial photoperiods during various periods of development. Such approaches reveal that even in the first few weeks of life, the pattern of melatonin secretion accords with daylength and modulates prolactin secretion. Several months later, after internal, growth-related cues indicate that sufficient body size has been achieved to initiate reproduction, photoperiod history is used as an important predictor of reproductive success, and thus, whether puberty should occur. In the female spring-born lamb, the decrease in daylength in autumn is the critical cue for the initiation of estrous cycles. Experimentally, this may be achieved by surgically disrupting the pathway for transmission of photic cues after appropriate long-day exposure. In the autumn-born lamb and in the slowly growing lamb, sexual maturation may be masked by the transition into seasonal anestrus the following spring. In these young females, a decreasing photoperiod or "removal of long days" (surgical) is not necessary for puberty the following autumn. Sufficient photoperiod history may be acquired in such lambs that they enter puberty as a consequence of becoming refractory to the long days of summer. We hypothesize that the phenomenon of refractoriness reflects the expression of an innate rhythm of reproductive activity and that changes in daylength experienced early in life serve to synchronize this rhythm with the seasonal environment.

Animals↗
PubMed2006

Pregnancy history and incidence of melanoma in women: a pooled analysis.

There is evidence that pregnancy history including age at first birth and parity may play a role in risk of cutaneous melanoma in women, although, epidemiological findings are inconsistent. We conducted a collaborative analysis of these factors using the original data from ten completed case-control studies (2391 cases and 3199 controls), and assessed the potential confounding effects of socioeconomic, pigmentary, and sun exposure-related factors. We found no overall association with ever having a live birth (pooled odds ratio (pOR) 0.95, 95% confidence interval (CI) 0.67-1.35). However, we detected a reduced risk of melanoma among women with higher parity (> or = 5 versus no live births pOR 0.76, 95% CI 0.49-1.18, each live birth pOR 0.95, 95% CI 0.91-0.99, p trend = 0.05). Women with both earlier age at first birth (e.g., <20 years) and higher parity (e.g., > or = 5 live births) had a particularly lower risk than women with later age at first birth (e.g., > or = 25 years) and lower parity (e.g., <5 live births) (pOR 0.33, 95% CI 0.14-0.75). The results are compatible with an effect of reproductive history-related factors on melanoma risk, but also could reflect differences in other factors, such as sun exposure history.

Adult↗
PubMedDate not supplied

[Reproductive risk factors and sexual history associated with cervical cancer in Mexico].

Uterine cervical cancer is one of the principal public health problems in Mexico. The national mortality rate for cervical cancer in 1991 is estimated at 9.5 per 100,000 women, representing 4,194 deaths. In the period from August 1990 to December 1992, a case-control study was carried out that included 630 cases of histologically confirmed cervical cancer in eight Mexico City hospitals (two for people with no social security cover, four of the social security system and two private). As controls, 1,005 women were chosen from a random sampling of houses in the Mexico City metropolitan area. The main cervical cancer risk factors found in this study, adjusted for a multivariate model, were multiple normals births (with five births OR of 1.93 and 95% C.I. of 1.22-2.73) and a history of two or more sex partners (the OR with four or more sex partners was 5.56 and a C.I. of 2.3-13.4). In addition, there was an estimated lower risk of disease related to starting a sex life after 25 years of age (OR 0.41 with C.I. of 0.25-0.69) and to having cesareans as compared versus one normal birth (OR 0.28 and C.I. of 0.13-0.61). The information obtained is relevant since it identifies Mexican women with a high-risk of developing cervical cancer which can be used in planning programs for the early detection of cancer in this population.

Adult↗
PubMed2006

History and evolution of reproductive and developmental toxicology guidelines.

Birth defects and other adverse outcomes of pregnancy have been known since before the industrial age, but the need for guidelines to test chemicals to which pregnant women might be exposed was defined by the thalidomide tragedy in the 1950s and early 1960s. During the five decades that followed the tragedy, guidelines were written to test drugs, foods, and environmental contaminants. The guidelines were written to fulfill national needs, and then were expanded to international levels in order to streamline procedures in the expanding global economy. Multiple sets of animal guidelines were written, based on the need to simulate human experience. It was soon realized that the underlying principles were similar for all guidelines. Guidelines gradually evolved in two directions, in complexity and number of endpoints measured and in the expansion of internationally acceptable guidelines. This manuscript reviews, in chronological order, some of the milestones in the development of guidelines for animal studies and in the interpretations for safety assessment. Guidelines for long-term and short-term studies are reviewed, followed by a discussion of recently added endpoints and the future integration process for the assessment of reproductive toxicity risk.

Animals↗
PubMed1991

[Physiological and pathological aging in bone--contribution of risk factors to bone loss with aging].

This study was performed to investigate the mechanism of the pathological ageing of bone, evaluating the effect of risk factors for osteoporosis on bone mineral density in elderly women (n = 108), ovariectomized (OVX; n = 86) and hysterectomized (HX; n = 75) middle-aged women. Possible risk factors such as family history, physique, reproductive function, calcium intake, physical activity and past history were studied by using questionnaires. Parameters of bone metabolism such as serum Ca, P, Al-p, parathyroid hormone (PTH), osteocalcin, vitamin D metabolites and urinary Ca/creatinine ratio were also measured. Spinal bone mineral densities (BMD) were determined by dual energy X-ray absorptiometry (DPX, Lunar). By multiple regression analysis, body height, PTH and serum Ca in HX group, alcohol consumption, serum Al-p, Ca, PTH, 1,25(OH)2D and 25(OH)D in OVX group were independent significant predictors for lumbar BMD. On the other hand, serum levels of Al-p and urinary Ca/creatinine ratio were independent, significant, but weak predictors in the elderly group. Thus, in the elderly group, it was difficult to predict specific factors affecting BMD when compared with the HX and OVX groups. Moreover, the coefficient of determination was smaller in the elderly group (r2 = 0.156) than those of the HX group (r2 = 0.205) and OVX group (r2 = 0.251). In elderly women, the frequencies of persons who dislike milk and who have low body weight (less than mean - SD) in low BMD with fractures were higher than those in normal BMD without fracture.(ABSTRACT TRUNCATED AT 250 WORDS)

Aged↗
PubMed2002

Seroepidemiology of beef and dairy herds and fetal study of Neospora caninum in Argentina.

The purpose of the present work was to study the epidemiology of Neospora caninum in beef and dairy herds in the Humid Pampas of Argentina. The seroprevalence of N. caninum was evaluated in 2414 serum samples of cows from beef and dairy farms. An indirect fluorescent antibody test (IFAT) was used to determine specific antibodies. The sera was screened at a dilution >or=1:200 and >or=1:600 in cows with reproductive disease antecedents and without them, respectively. Cows without history of reproductive diseases from nine beef and fifteen dairy farms were grouped according to the percentage (> or or <or= to 50%) of seropositive dogs. The analysis of 966 serum samples from aborted cows, demonstrated positive 18.9% (41/216) and 43.1% (323/750) from beef and dairy herds, respectively. Microscopic lesions compatible with N. caninum were observed in 43 of 188 (22.8%) fetuses and/or placentas evaluated. The protozoan was identified in 29 of 43 (67.4%) aborted specimens, being the largest number of positive results in dairy fetuses. The results obtained demonstrate a high association between neosporosis and dairy herds, however, our data also reveals that N. caninum is an important risk factor for reproductive losses in the extensively farmed beef cattle in the Humid Pampas of Argentina.

Aborted Fetus↗
PubMed1998

[Breast cancer and heredity: results of a population case-control study in Girona].

BACKGROUND: To characterise the relationship between breast cancer and different aspects of the reproductive life, use of drugs and alcohol by family history of breast cancer. PATIENTS AND METHODS: From the cancer registry of Girona, Spain, 330 women were identified with histologically confirmed breast cancer during 1986-1989. For each case, a control woman was selected from a random sample of the population living in the matched area to the case by age (+/- 5 yr.). The information was collected by a personal interview and included: family history of breast cancer, reproductive history, presence of acne during the teenage years, use of oral contraceptives and drugs for sleep and anxiety disorders, and alcohol consumption. RESULTS: 18.5% of breast cancer cases and 8.9% of all controls had a family history of breast cancer. Family history on a first degree relative (mother or sister) was present in 10.6% of the cases and 2.8% of controls, which represented an odds ratio for breast cancer of 3.7 (95% CI, 1.8-7.8) higher than the general population. Women with a first degree family history of breast cancer were at higher risk for breast cancer if they had a history of acne during the teenage period (OR = 2.4; 95% CI, 1.1-5.2) and if they referred long menstrual periods in the early years of menarche (OR = 3.1; 95% CI, 1.3-7.0). Women with no family history had a higher breast cancer risk if they had a late menarche, long menstrual periods, late first full term pregnancy, and history of acne during puberty. Alcohol consumption and use of drugs for anxiety and sleep disorders were associated with a decreased risk of breast cancer. CONCLUSIONS: First degree family history of breast cancer seems to be the best risk indicator for developing breast cancer. Long menstrual periods and presence of acne during puberty may indicate hormonal imbalance that act independently of the family history in breast cancer development.

Adult↗
PubMed1987

A prospective study of postpartum psychoses in a high-risk group. 2. Relationships to demographic and psychiatric history characteristics.

Among 88 reproductions to women with a history of nonorganic psychosis, 25 postpartum episodes (PPPs) occurring during the total 6-month period following the current delivery were not systematically related to the woman's demographic characteristics, to her psychiatric history characteristics surrounding onset of the previous disorder or to a history of PPPs following previous reproductions. PPPs were highly significantly related to greater length of previous psychiatric hospitalization and to active mental disturbance just prior to this pregnancy, and this was true both for PPPs developing within 3 weeks of delivery and for those developing later. Considerable differences were found in the demographic characteristics that were related to development of PPPs within these Early vs. Later Onset cases, suggesting these to represent different disorders not only diagnostically but also demographically. In several diagnostic categories, selected demographic or psychiatric history characteristics identified subgroups with PPP rates as high as 75%.

Adult↗
PubMedDate not supplied

Relationship of reproductive cycle-associated and non-reproductive cycle-associated psychological problems in women.

OBJECTIVE: To determine the frequency of past psychological problems associated with the reproductive cycle in women seeking routine gynecological care. METHODS: Three hundred and sixty-eight women of menopausal age seen at a university medical center gynecology clinic were mailed a questionnaire requesting information about past mood or anxiety problems associated with specific reproductive cycle or hormone use times, such as the premenstruum, pregnancy, postpartum, perimenopause, following total hysterectomy with bilateral salpingo-oophorectomy, and during oral contraceptive or hormone replacement treatment. Chi-square analysis was done between groups categorized as with and without reproductively associated psychological problems (RAPP) and with or without non-reproductively related psychological problems (non-RAPP). Relative risk of women with RAPP having non-RAPP also was calculated. Results-One hundred thirteen women returned the questionnaire. Fifty percent of these women reported a past history of reproductive cycle-associated psychological problems (RAPP). Of these, 37% also reported psychological problems at times in their lives not associated with particular reproductive cycle (non-RAPP) times. However, of the 50% of women who reported no history of RAPP, only 14% reported non-RAPP. This was a significant difference between the groups (p = .0064). There was also a 2.7 times greater risk of women with RAPP also having non-RAPP (RR 2.7). CONCLUSIONS: Women with reproductively associated psychological problems have a greater risk of also having psychological problems at non-reproductively associated times.

Adult↗
PubMed1992

Effect of family history, body-fat distribution, and reproductive factors on the risk of postmenopausal breast cancer.

BACKGROUND: A family history of breast cancer reflects shared cultural factors, genetic predisposition, or both. There is evidence that the estimated risk associated with a family history of breast cancer increases multiplicatively in combination with other risk factors. We examined the combined effect of family history and anthropometric and reproductive factors on the risk of breast cancer in postmenopausal women. METHODS: Using data from a prospective cohort study, we studied 37,105 women 55 to 69 years of age to determine whether known risk factors for breast cancer are modified by a reported family history at the time of entry into the study. RESULTS: During the first 4 years of follow-up, 493 new breast cancers were diagnosed. The association of the waist-to-hip ratio (the circumference of the waist divided by that of the hips) with the risk of breast cancer was limited predominantly to women with a family history of breast cancer; the age-adjusted relative risk of breast cancer for the women above the fourth quintile for waist-to-hip ratio as compared with those below the first quintile was 3.2 in women with a family history of breast cancer and 1.2 for women without such a family history. An interaction was observed between a family history of breast cancer and the number of live-born children; the protective effect of higher parity was observed primarily among women with a family history of breast cancer. Similarly, the age-adjusted relative risk of breast cancer associated with a late age at first pregnancy (i.e., greater than or equal to 30 years) was 5.8 for women with a family history of breast cancer and 2.0 for women without such a family history. CONCLUSIONS: The increase in the risk of breast cancer associated with a high waist-to-hip ratio, low parity, or greater age at first pregnancy is more pronounced among women with a family history of breast cancer. These findings suggest etiologic differences between familial breast cancer and the sporadic form.

Adipose Tissue↗
PubMedDate not supplied

Parity status and the development of rheumatoid arthritis.

Rheumatoid arthritis (RA) is one of a number of autoimmune diseases with a marked female excess in incidence, particularly during the reproductive years. It is of interest to investigate whether reproductive factors are important in determining susceptibility to RA. However, difficulties in dating the pathological onset of the disease can make it difficult to distinguish between the reproductive influence history on disease and the influence of (subclinical) disease on reproduction. In women with RA compared to controls, there is no excess of being unmarried. Most but not all studies, show an increase in nulliparity, whereas parity rates in fertile RA women are unchanged. There is an increased rate of onset postpartum, particularly in the first three months after delivery. There is no unifying biological explanation for these epidemiological findings, and it is likely that the apparently obvious link between reproductive experience and pregnancy is complex.

Arthritis, Rheumatoid↗