Search results for "Traits"
showing 10 items of 548 documents
Protein and β-ODAP content and their association with yield contributing traits in selected grass pea lines
2009
Eight selected grass pea (Lathyrus sativus L.) lines were evaluated over three different growing seasons (2005-2008) at the experimental field at the ‘Sparacia farm’ (Cammarata-AG) in Sicily. A randomized complete-block design with three replicates was adopted. 35 viable seeds/m2 of each line were placed at the end of autumn in rows distant 50 cm. After one summer ploughing, 90 kg ha-1 di P2O5 were filled during two harrowing before sowing; later two manual weeds control were performed. Harvest was executed at full maturity of pods (end of the spring). Temperature values and effective rainfall for each season were recorded. Information are presented on the variability in storage seed protei…
Assessing the Cost of Mounting an Immune Response
2003
International audience; The evolution of parasite resistance has often been assumed to be governed by antagonistic selection pressures. Defense against pathogens, by mounting an immune response, confers evident benefits but may also incur costs, so that the optimal level of defense is expected to depend on the balance between benefits and costs. Although the benefits of immune surveillance are well known, estimates of costs are still equivocal. Here we studied the behavioral and physiological modifications associated with exposure to a onreplicating antigen (lipopolysaccharide [LPS] of Escherichia coli) in a passerine species, the house sparrow (Passer domesticus).We further investigated wh…
Detection of genomic regions underlying milk production traits in Valle del Belice dairy sheep using regional heritability mapping
2021
The aim of this study was to identify genomic regions underlying milk production traits in the Valle del Belice dairy sheep using regional heritability mapping (RHM). Repeated measurements for milk yield (MY), fat percentage and yield (F% and FY) and protein percentage and yield (P% and PY), collected over a period of six years (2006-2012) on 481 Valle del Belice ewes, were used for the analysis. Animals were genotyped with the Illumina 50k SNP chip. Variance components, heritabilities, and repeatability within and across lactations were estimated, fitting parity, litter size, season of lambing, and fortnights in milk, as fixed; and additive genetic, permanent environment within and across …
Absence of long-term effects of reproduction on longevity in the mouse model.
2014
Background Most human demographic data, particularly those on natural fertility populations, find no relationship or even a positive association between fertility and longevity. The present study aims to ascertain whether there is a trade-off between fertility and longevity in the mouse model. Methods The study was focused on the first litter produced by 10- to 14-wk-old hybrid (C57BL/6JIco female X CBA/JIco male) mice. A single female/male per litter was individually housed with a male/female at the age of 25 and 52 wk, respectively, until the end of reproductive life in females or natural death in males under controlled housing conditions. Post-reproductive females and virgin mice were re…
Coping, stress, and personality in Spanish nursing students: A longitudinal study
2014
The purpose of this study was to examine the dominant stress coping style in nursing students, its relationships with stressful life events and personality traits, and the students' changes during their academic training. A non-experimental two-wave longitudinal design was carried out in 199 nursing students recruited from three Spanish nursing schools. The Stressful Life Events Scale, NEO-FFI, and COPE questionnaire were administered at the beginning (T1) and end (T2) of their nursing studies. Descriptive statistics, Anova(s), NPar tests, and Pearson correlations were carried out. Results show that nursing students' dominant coping style was emotion-focused coping, both at T1 and T2. Highl…
The role of personality traits in leisure time physical activity during COVID-19 pandemic
2021
The COVID-19 pandemic has affected everyday life, including physical activity behavior. This study examined the role of the five factor model of personality traits on leisure time physical activity during the pandemic in a sample (n=168) of 61 year-old Finnish men and women, participating in a larger longitudinal study, between April 2020 and April 2021. Frequency of participation and changes in leisure time physical activity were self-reported. Personality traits and facets were assessed with the 181-item NEO-PI. Openness was the only factor positively associated with leisure time physical activity frequency. Participants scoring higher in extraversion (particularly the activity-facet) and…
The moderating effect of extraversion on the relation between self-reported and observed parenting
2005
Abstract The present study examined multiple measures of parenting (i.e., nurturance reported by parents themselves, child-centered behavior rated by trained observers, and child-reported parenting and family atmosphere) and their association with parents' personality trait of extraversion ( E ). The study was part of the Jyvaskyla Longitudinal Study of Personality and Social Development and it concerned 106 families with school-aged children (8–13 years of age). Data on parenting were collected from parents (54 mothers and 52 fathers) and children (48 girls and 58 boys) through questionnaires; in addition, behavioral observations were conducted to measure parent–child interaction. The resu…
Stress and neuroticism in Spanish nursing students: A two-wave longitudinal study
2012
The aim of this study was to clarify the direction of the stress� neuroticism relationship in a sample of 200 nursing students from three Spanish universities before their entry into the work force using a twowave longitudinal design. The Stressful Life Events Scale and NEO-FFI Neuroticism subscale were administered at the beginning (T1) and end (T2) of nursing studies. Female students reported higher scores in both perceived stress due to life events and neuroticism than males. Older students scored higher in life events stress than younger ones. High neuroticism was associated with a high level of stress. Finally, neuroticism scores rose in the group in which stress increased from T1 to T…
Personality Trait Changes Among Young Finns: The Role of Life Events and Transitions
2014
Recent research has shown that personality traits continue to develop throughout the life span, but most profound changes are typically found during young adulthood. Increasing evidence suggests that life events play a significant role in many of these changes. The present longitudinal study examined the role of work, education, social, and health-related life events in the development of the Big Five traits among young Finns. Participants were originally recruited in 2004 through elementary schools in a middle-sized Finnish city. Participants' Big Five traits and life events were measured via self-reports at ages 20 and 23 (Ns = 597 and 588, respectively). Entering work life, beginning a r…
Longitudinal study on reciprocity between personality traits and parenting stress
2014
Reciprocal associations between the Big Five personality traits and parenting stress—including both parents’ feelings of their distress and perception of their incompetence as parents—were studied with 248 participants (49% of which were males). Longitudinal data, collected at ages 33/36, 42 and 50 years, were used. Cross-lagged path analysis revealed that in case of both mothers and fathers, neuroticism at age 33 predicted high parenting stress, and extraversion at age 33 predicted low parenting stress at age 42. Also, parenting stress at age 36 predicted high neuroticism and low extraversion at age 42. From age 42 to 50, only high parenting stress contributed to low neuroticism. Thus, mo…