• Asian-Australasian Journal of Animal Sciences
• /
• v.19 no.1
• /
• pp.7-12
• /
• 2006

The objective of this study was to estimate genetic parameters between first and later parities as different traits in reproductive traits of pigs using multiple trait animal model procedures. Data related to reproductive traits from a total of 2,371 individuals maintained at a farm were taken from the pedigree file. Sires and dams were consisted of Duroc, Landrace, and Yorkshire breeds, respectively. The first and later parity records were considered as different traits. Traits included in analyses were total pigs born (TB1), number of pigs born alive (NBA1), number of pigs weaned (NW1), and litter weaning weight (LWT1) in the first parity, and total pigs born (TB2), number of pigs born alive (NBA2), number of pigs weaned (NW2), litter weaning weight (LWT2) and interval between farrowing events (FTF) in later parities. Heritability estimates of TB1, NBA1, NW1 and LWT1 in the first parity were 0.27, 0.25, 0.16 and 0.20, respectively. For TB2, NBA2, NW2, LWT2 and FTF in later parities, heritabilities were estimated as 0.15, 0.15, 0.08, 0.11 and 0.07, respectively. Genetic correlations between sow reproductive traits in the first parity and in the second and later parity were estimated to be 0.89, 0.77, 0.58 and 0.66, respectively, between TB1 and TB2, NBA1 and NBA2, NW1 and NW2, and LWT1 and LWT2. While phenotypic correlations between TB1 and TB2, NBA1 and NBA2, NW1 and NW2, and LWT1 and LWT2 were estimated as 0.18, 0.15, 0.06 and 0.10, respectively. Genetic correlations between reproductive traits of first and later parities were not high indicating that reproductive traits for sows should be analyzed while considering the parities as different traits.

• Asian-Australasian Journal of Animal Sciences
• /
• v.28 no.4
• /
• pp.476-484
• /
• 2015

The objective of this study was to estimate genetic and phenotypic parameters for linear type traits, as well as milk yield (MY), fat yield (FY) and protein yield (PY) in 18,831 Holstein cows reared in 495 herds in Brazil. Restricted maximum likelihood with a bivariate model was used for estimation genetic parameters, including fixed effects of herd-year of classification, period of classification, classifier and stage of lactation for linear type traits and herd-year of calving, season of calving and lactation order effects for production traits. The age of cow at calving was fitted as a covariate (with linear and quadratic terms), common to both models. Heritability estimates varied from 0.09 to 0.38 for linear type traits and from 0.17 to 0.24 for production traits, indicating sufficient genetic variability to achieve genetic gain through selection. In general, estimates of genetic correlations between type and production traits were low, except for udder texture and angularity that showed positive genetic correlations (>0.29) with MY, FY, and PY. Udder depth had the highest negative genetic correlation (-0.30) with production traits. Selection for final score, commonly used by farmers as a practical selection tool to improve type traits, does not lead to significant improvements in production traits, thus the use of selection indices that consider both sets of traits (production and type) seems to be the most adequate to carry out genetic selection of animals in the Brazilian herd.

• Animal Bioscience
• /
• v.35 no.7
• /
• pp.955-963
• /
• 2022

Objective: The aim of this study was to estimate genetic parameters for 305-day cumulative milk yield and components, growth, and reproductive traits in Guzerá cattle. Methods: The evaluated traits were 305-day first-lactation cumulative yields (kg) of milk (MY305), fat (FY305), protein (PY305), lactose (LY305), and total solids (SY305); age at first calving (AFC) in days; adjusted scrotal perimeter (cm) at the ages of 365 (SP365) and 450 (SP450) days; and adjusted body weight (kg) at the ages of 210 (W210), 365 (W365), and 450 (W450) days. The (co)variance components were estimated using the restricted maximum likelihood method for single-trait, bi-trait and tri-trait analyses. Contemporary groups and additive genetic effects were included in the general mixed model. Maternal genetic and permanent environmental effects were also included for W210. Results: The direct heritability estimates ranged from 0.16 (W210) to 0.32 (MY305). The maternal heritability estimate for W210 was 0.03. Genetic correlation estimates among milk production traits and growth traits ranged from 0.92 to 0.99 and from 0.92 to 0.99, respectively. For milk production and growth traits, the genetic correlations ranged from 0.33 to 0.56. The genetic correlations among AFC and all other traits were negative (-0.43 to -0.27). Scrotal perimeter traits and body weights showed genetic correlations ranging from 0.41 to 0.46, and scrotal perimeter and milk production traits showed genetic correlations ranging from 0.11 to 0.30. The phenotypic correlations were similar in direction (same sign) and lower than the corresponding genetic correlations. Conclusion: These results suggest the viability and potential of joint selection for dairy and beef traits in Guzerá cattle, taking into account reproductive traits.

• Animal Bioscience
• /
• v.35 no.3
• /
• pp.377-384
• /
• 2022

Objective: This study was conducted to estimate multi-trait genetic parameters for somatic cell score (SCS), milk yield and type traits in Nigerian Dwarf (ND) goats from the United States. Methods: Data from 1,041 ND goats in the United States with kiddings in 95 herds were used to estimate multi-trait genetic parameters for SCS, milk (MILK), fat (FAT), and protein (PROT) yields, and 14 type traits. An 18-trait mixed linear animal model for lactation mean SCS (Log₂), MILK, FAT, PROT, and 14 type traits was applied. A factor analytic approach (FA1) in ASReml software was used to obtain convergence. Results: Averages for SCS were low (2.85±1.29 Log₂), and were 314±110.6, 20.9±7.4, and 14±4.9 kg, respectively, for MILK, FAT, and PROT. Heritabilities for SCS, MILK, FAT, and PROT were 0.32, 0.16, 0.16, and 0.10, respectively. The highest heritabilities for type traits were for stature (0.72), teat diameter (0.49), and rump width (0.48), and the lowest estimates were for dairyness (0.003) and medial suspensory ligament (0.03). Genetic correlations of SCS with MILK, FAT, and PROT were positive but low (0.25, 0.18, and 0.23, respectively). Genetic and phenotypic correlations between MILK, FAT, and PROT were high and positive (≥0.66). Absolute values of genetic correlations involving SCS with type traits were generally low or no different from zero. Most of the phenotypic correlations involving SCS with type traits were low. No serious unfavorable genetic correlations between milk yield traits and SCS or between milk yield traits or SCS and type traits were found. Conclusion: Genetic variation exists in the ND breed for most studied traits. The development of selection programs based on these estimates may help accelerate favorable multi-trait genetic changes in this breed.

• Journal of Families and Better Life
• /
• v.24 no.1 s.79
• /
• pp.1-9
• /
• 2006

The purpose of this research is to identify stereotypes toward the mother-in-law held by female students. Stereotypes toward the mother-in-law were examined at two levels: to assess female students' beliefs about the traits of mother-in-law and to categorize the traits into stereotypes. The main results of this study were as follows: 1) Students reported 91 traits associated with the mother-in-law. 2) Hierarchical cluster analysis of the trait groupings revealed two high-level clusters: a cluster of 42 positive traits and a cluster of 49 negative traits. Within the positive and negative clusters, 14 middle-level categories, 6 positive categories(tough, leisurely, traditional image of prudent elders, image of the eldest in the family, intimate, tolerant), and 8 negative categories(dominant, self-assertive, cold, discriminating, fearful, mean, sadistic, authoritative, nervous) were identified. This results suggested that female students believed negative stereotypes are more typical than positive ones.

• Journal of the Korean Home Economics Association
• /
• v.41 no.10 s.188
• /
• pp.173-184
• /
• 2003

The purpose of this research is to identify stereotypes toward the single women(30-49 age) held by university students. Stereotypes toward the single women were examined at two levels: to assess students' beliefs about the traits of single women and to categorize the traits into stereotypes. The main results of this study were as follows: 1) Students reported 99 traits associated with the single women. 2) Hierarchical cluster analysis of the trait groupings revealed two high-level clusters: a cluster of 45 positive traits and a cluster of 54 negative traits. Within the positive and negative clusters, 10 middle-level categories, 4 positive categories(enjoy living affluently, independence-oriented, progressive, openhearted), and 6 negative categories(lack of vitality, pitiful, self-centered, picky, childish, self-defensive) were identified. This results suggested that young adults believed negative stereotypes are more typical than positive ones.

• Anxiety and mood
• /
• v.5 no.1
• /
• pp.3-7
• /
• 2009

In this article, we review research on how normal personality traits and personality disorder traits may relate to anxiety disorders ; as predisposing factors, 2) as complications, 3) as pathoplastic factors, and 4) as manifestations of common underlying etiologies. Based on current literatures, we draw a conclusion as follows : 1) Normal personality traits such as high neuroticism and low extraversion and personality disorder traits, especially cluster C traits, are at least risk factors for certain anxiety disorders ; 2) Anxiety disorders in early life might influence a later development of personality disorder ; 3) Personality disorder traits may have negative influence on the outcome of anxiety disorders ; 4) Personality and anxiety disorders may be manifestations of common genetic and environmental etiologies.

• Journal of the Korean Home Economics Association
• /
• v.49 no.8
• /
• pp.47-61
• /
• 2011

This study aimed to analyze the influential relation among personality traits, self-esteem and life satisfaction of the elderly and to analyze the differences in the conceptual variables according to demographic factors. The survey was conducted from January 10 to February 20 in 2011, and the participants were 282 seniors over the age of 60 in Gangwon province areas. As a result, the personality traits of the elderly were classified into openness, agreeableness, conscientiousness, neuroticism, and extraversion. There were partially significant differences in the personality traits, self-esteem and life satisfaction according to demographic factors. The personality traits such as openness, agreeableness, conscientiousness, and extraversion had a positive impact on self-esteem and satisfaction of positive life. The neuroticism of personality traits had a negative impact on satisfaction of positive life, while it had a positive impact on satisfaction of negative life.

• Journal of Information Technology Applications and Management
• /
• v.20 no.3
• /
• pp.19-30
• /
• 2013

The objective of this research is to identify a web portal's specific functions and layouts that are aligned with personality trait of an individual internet user. This first stage of the overall research project intends to check whether the research instrument, namely the NEO Five Factors Inventory (NEO-FFI), is applicable to assess the personality traits of Thai internet users. Based on these personality traits, text-based description of functions/layouts of a web portal was developed and given to professional designers to mock up example web portal pages. These web portal pages were in alignment with individual personality traits. Rating data on the functions/layouts corresponding to individual personality traits were collected from an online survey of 207 Thai internet users. Results showed that respondents gave more consistent rating to the functions/layouts close to their individual personality traits identified in the text-based descriptions than in the mocked-up web portal pages.

• Journal of Plant Biotechnology
• /
• v.37 no.1
• /
• pp.67-71
• /
• 2010

Output traits centered on improved plant-based products will find their way to consumers in such ways as nutritionally enhanced foods, therapeutic proteins for disease treatment and vaccines, bio-industrial products, modified oil quality and biofuels. Significant progress in biotechnology has occurred over the last several decades. The importance of output traits development and production using biotechnology will impact not only agribusiness, but also pharmaceutical and food industries. The objective of this paper is to review briefly the current status of output traits development in crop plants using nutrients and pharmaceuticals as examples.