Prevalence of cannabis use for pain management in Quebec: A post-legalization estimate among generations living with chronic pain

Background

Medical cannabis has been legal in Canada since 2001, and recreational cannabis was legalized in October 2018, which has led to a widespread increase in the accessibility of cannabis products.

Aims

This study aimed to estimate the prevalence of cannabis use among adults living with chronic pain (CP) and investigate the relationship between age and cannabis use for CP management.

Methods

A cross-sectional analysis of the COPE Cohort data set, a large Quebec sample of 1935 adults living with CP, was conducted. Participants completed a web-based questionnaire in 2019 that contained three yes/no questions about past-year use of cannabis (i.e., for pain management, management of other health-related conditions, recreational purposes).

Results

Among the 1344 participants who completed the cannabis use section of the questionnaire, the overall prevalence of cannabis use for pain management was 30.1% (95% confidence interval 27.7-32.7). Differences were found between age groups, with the highest prevalence among participants aged ≤26 years (36.5%) and lowest for those aged ≥74 years (8.8%). A multivariable logistic model revealed that age, region of residence, generalized pain, use of medications or nonpharmacological approaches for pain management, alcohol/drug consumption, and smoking were associated with the likelihood of using cannabis for pain management.

Conclusions

Cannabis is a common treatment for the management of CP, especially in younger generations. The high prevalence of use emphasizes the importance of better knowledge translation for people living with CP, rapidly generating evidence regarding the safety and efficacy of cannabis, and clinicians' involvement in supporting people who use cannabis for pain management.

Past, Present, and Future Trends of Nickel Titanium Rotary Instrumentation

This article reviews the historical development, properties, and trends of nickel titanium rotary instrumentation use for the veterinary endodontist.

Historical and generational forces in the Iridescent Life Course of bisexual women, men, and gender diverse older adults

PURPOSE

Little is known about the life course of bisexual older adults. This study examines life events and experiences of bisexuals by generation: Pride Generation, born 1950-1964; Silenced Generation, born 1935-1949; and Invisible Generation, born 1934 or earlier, as well as by gender among women, men, and gender diverse older adults.

METHODS

Aging with Pride: National Health, Aging, and Sexuality/Gender Study is the first national longitudinal study of LGBTQ older adults in the US. We utilize the Iridescent Life Course to examine the life events and life course experiences of bisexual older adults (N = 216) using 2014 survey data. The Iridescent Life Course frames this study for comparing generational and gender differences in five key areas: identity development; work; kin and social relationships; bias-related experiences; and physical and mental health.

FINDINGS

The Invisible Generation, the oldest generation, compared to the two younger generations, reports significant risks related to social relationships, the lowest levels of openly disclosing, and fewer bias-related experiences. They also demonstrate important signs of resilience and better mental health. Bisexual men and gender diverse older adults report higher rates of bias-related experiences and fewer social resources than bisexual women.

CONCLUSION

Based on the Iridescent Life Course, we document important differences in the heterogeneity and intersectionality in bisexual lives, particularly for those in late life and those gender diverse. It is essential to document the distinct nature of bisexuals' life course, as it provides both historical and contemporary insights into aging and the reframing of future research.

Birth Cohorts and Cognitive Reserve Influence Cognitive Performances in Older Adults

BACKGROUND

Evidence suggests birth cohort differences in cognitive performance of older adults. Proxies of cognitive reserve (CR), such as educational attainment and occupational complexity, could also partly account for these differences as they are influenced by the sociocultural environment of the birth cohorts.

OBJECTIVE

To predict cognitive performance using birth cohorts and CR and examine the moderating influence of CR on cognitive performance and structural brain health association.

METHODS

Using ADNI data (n = 1628), four birth cohorts were defined (1915-1928; 1929-1938; 1939-1945; 1946-1964). CR proxies were education, occupational complexity, and verbal IQ. We predicted baseline cognitive performances (verbal episodic memory; language and semantic memory; attention capacities; executive functions) using multiple linear regressions with CR, birth cohorts, age, structural brain health (total brain volume; total white matter hyperintensities volume) and vascular risk factors burden as predictors. Sex and CR interactions were also explored.

RESULTS

Recent birth cohorts, higher CR, and healthier brain structures predicted better performance in verbal episodic memory, language and semantic memory, and attention capacities, with large effect sizes. Better performance in executive functions was predicted by a higher CR and a larger total brain volume, with a small effect size. With equal score of CR, women outperformed men in verbal episodic memory and language and semantic memory in all cohorts. Higher level of CR predicted better performance in verbal episodic memory, only when total brain volume was lower.

CONCLUSION

Cohort differences in cognitive performance favor more recent birth cohorts and suggests that this association may be partly explained by proxies of CR.

Difference in Body Weight at Breeding Affects Reproductive Performance in Replacement Beef Heifers and Carries Consequences to Next Generation Heifers

Simple Summary

The effect of prebreeding feeding to attain 55% vs. 65% of mature cow body weight (MBW; 545 kg) at breeding on the reproductive performance of beef heifers and its offspring was investigated. Angus-cross dam heifers from weaning were randomly fed to attain 55% (n = 1622) vs. 65% (n = 1578) of MBW and off-spring (F1) heifers born to dam heifers in both 55% (n = 1285) vs. 65% (n = 1324) groups were fed to attain 65% of MBW. Results showed that restricted feeding negatively affected puberty, breeding season pregnancy and 21-day calving rates. F1 generation heifers that were fed normal diets but were born to dams that were fed restricted diets also had reduced puberty, breeding season pregnancy and 21-day calving rates. In conclusion, restricted feeding during the prebreeding period of dam heifers reduced post-pubertal fertility and fertility of their heifer offspring that were fed normal prebreeding diets.

Abstract

Nutrition imprinting carries consequences across generations. The effect of 55% vs. 65% of mature cow body weight (MBW; 545 kg) at breeding on the reproductive performance of heifers and their offspring was investigated. Angus-cross dam heifers were randomly fed to attain 55% (n = 1622) vs. 65% (n = 1578) of MBW, and offspring (F1) heifers born to dam heifers [55% (n = 1285) vs. 65% (n = 1324)] were fed to attain 65% of MBW. Bodyweight and reproductive indices were recorded throughout the study. In dam heifers, puberty (44% vs. 53%), breeding season pregnancy (86.4% vs. 90.6%) and 21-day calving rates (55.2% vs. 65.4%) did vary, but dystocia rate (8.7% vs. 9.0%) did not differ between 55% and 65% MBW groups. Puberty (49.2% vs. 58.2%), breeding season pregnancy (87.2% vs. 92.8%) and 21-day calving rates (53.8% vs. 64.1%) did differ (p < 0.05), but dystocia rate (8.4 vs. 9.2%) did not differ between F1 heifer groups. In conclusion, 55% of MBW at breeding negatively affected the reproductive performance of heifers and its offspring heifers. The recommendation is to feed heifers a balanced diet to reach 65% of MBW at breeding with consideration of production traits.

Gender Identity Milestones, Minority Stress and Mental Health in Three Generational Cohorts of Italian Binary and Nonbinary Transgender People

Transgender and gender nonconforming (TGNC) people experience high rates of minority stress and associated risk for negative health outcomes. However, during the last years, significant positive socio-cultural changes have happened, and younger cohorts of TGNC individuals are having diverse experiences compared to older cohorts. By integrating the minority stress theory and the life course perspective, this cross-sectional, web-based study aimed to explore in 197 Italian TGNC people aged 18 to 54 years (M = 29.82, SD = 9.64) whether the average ages of gender identity milestones (i.e., first insights about being TGNC, self-labeling as a TGNC person, and coming out), minority stress, and mental health vary among three generational cohorts (i.e., Generation Z, Millennials, and Generation X). Compared with older cohorts, younger participants: (a) were more likely to be in the trans-masculine spectrum; (b) self-labeled as TGNC and came out earlier; (c) had more negative expectations and lower levels of disclosure; and (d) had higher levels of mental health problems. No generational differences related to first insights about being TGNC and distal minority stressors were found. Furthermore, compared with binary individuals, participants with a non-binary identity: (a) reported later ages for the gender identity milestones; (b) had higher negative expectations; and (c) had higher levels of mental health problems. Overall, our findings indicated that changes in the social environments have a limited impact on stigmatization processes and mental health of Italian TGNC people.

Preconditions to parenthood: changes over time and generations

Reproductive decision-making and fertility patterns change with time and place, and are influenced by contemporary societal factors. In this paper, we have studied biosocial aspects of reproductive decision-making over time and generations in a Nordic setting. The aim was to explore intergenerational changes and influences on decision-making, especially regarding preconditions to first birth. Twenty-six focus group interviews were conducted in southern Sweden, including a total of 110 participants aged 17-90 years. The analysis of the interviews resulted in six themes: (i) 'Providing security - an intergenerational precondition'; (ii) 'A growing smorgasbord of choices and requirements'; (iii) 'Parenthood becoming a project'; (iv) 'Stretched out life stages'; (v) '(Im)possibilities to procreate'; and (vi) 'Intergenerational pronatalism'. Our findings reflect increasing expectations on what it means to be prepared for parenthood. Despite increasing awareness of the precariousness of romantic relationships, people still wish to build new families but try to be as prepared as possible for adverse events. The findings also show how increasing life expectancy and medical advancements have come to influence people's views on their reproductive timeline.

Intergenerational Commensality: A Critical Discussion on Non-Familial Age Groups Eating Together

Connecting intergenerational relationships and commensality has been a neglected area in research and conceptual development within both food and life-course studies. This has been especially true of relations beyond the family. Here, public and private settings are explored in order to examine the relationship between eating together and generationally intelligent empathy. This is to help the discovery of spaces where different generations can interact positively around food and mealtimes. Contemporary social and public health challenges include: to adapt to increased longevity and to build solidarity between generations; to repair the relations between generations arising from institutional segregation; and to increase experiences of generational connection and social inclusion. As age-based cohorts are led to see themselves as separate from each other, we must find ways of building and negotiating new complementary roles for different parts of the life-course. Commensality, eating together at the same table provides an important cultural location and opportunity around which complementary understandings between generations may be built. A new framework is proposed to help identify and critically examine the variables underpinning non-familial intergenerational commensal spaces.

Generation Gaps in Digital Health Literacy and Their Impact on Health Information Seeking Behavior and Health Empowerment in Hungary

Background: Today the internet is a major source of health information, and younger generations have more confidence in their digital information seeking skills and awareness of online resources than older generations. Older generations, however, are more in demand of health services. The aim of our study was to explore these generational differences as related to self-perceived eHealth literacy and health care system utilization.

Methods: A cross-sectional survey study with 522 subjects was done in Hungary. Every subject belonged to one of four generations (Baby boomers, X, Y, and Z). The Web-based survey was designed and tested in English-speaking countries and translated into Hungarian for the present study. Variables include Internet health information seeking, eHealth literacy (measured by eHeals score), the self-perceived gain in empowerment by that information, and the number of health care appointments. One-way ANOVA was used for comparing the scores of the generations, and correlational and linear regression analysis was employed within the generations for further data analysis.

Results: We found significant differences among the generations in eHealth literacy as well as in the self-perceived gain in empowerment: while Boomers were the generation with the lowest eHeals scores, they showed the highest empowerment. Internet health information seeking behavior showed no differences. While subjects who use the Internet more frequently to search for health information have worse self-rated health status, the ones with higher eHeals scores report better subjective health status. We also identified the associations of the above variables within the older generations (Boomers and X) with the frequency of using health-care services: within the generation of Boomers the number of health care appointments was only associated with Internet health information seeking, while in Generation X with eHeals.

Conclusions: Baby boomers seek Internet health information as often as the younger generations, which provides a solid motivation for developing their eHealth literacy skills. We find it crucial to plan the Hungarian health promotion programmes utilizing this high frequency of Internet health information seeking, since the eHealth literacy skills of older generations have an effect on their subjective health status, and they are the most capable of applying information in making decisions.

Learning in virtual space: an intergenerational pilot project

Introduction: More and more educational institutions are discovering the advantages of settings for digital teaching and learning and the technology of virtual reality (VR). This also holds true for the BZ Pflege in the field of continuing education with age-heterogeneous groups of participants. The question arises whether baby-boomers and X and Y generation learners accept, understand and perceive the digital form of learning with VR glasses as beneficial for their learning.

Project description: A course has been developed with the goal of teaching the anatomy of the heart by immersive visualisation. A questionnaire was used to determine how the use of VR glasses influenced participants` learning, acceptance, understanding and cognitive load.

Results: The participants reacted positively to the VR technology. The new learning technology did not lead to cognitive overload. Participants indicated that they were able to link new knowledge with already existing knowledge. They also found the VR glasses easy to use.

Conclusion: From the perspective of participants and project management alike, it can be said that age- heterogeneous groups present no obstacle for new innovative teaching methods, such as the use of VR glasses.

Sulfonimide-Based Dendrimers: Progress in Synthesis, Characterization, and Potential Applications

There are more than 50 families of dendrimers, and some of which, such as polyamidoamine PAMAM, are well studied, and some are just starting to attract the attention of researchers. One promising type of dendrimers is sulfonimide-based dendrimers (SBDs). To date, SBDs are used in organic synthesis as starting reagents for the convergent synthesis of higher generations dendrimers, in materials science as alternative electrolyte solutions for fuel cells, and in medicinal chemistry as potential substances for drug transfer procedures. Despite the fact that most dendrimers are amorphous substances among the SBDs, several structures are distinguished that are prone to the formation of crystalline solids with melting points in the range of 120-250 °C. Similar to those of other dendrimers, the chemical and physical properties of SBDs depend on their outer shell, which is formed by functional groups. To date, SBDs decorated with end groups such as naphthyl, nitro, methyl, and methoxy have been successfully synthesized, and each of these groups gives the dendrimers specific properties. Analysis of the structure of SBD, their synthesis methods, and applications currently available in the literature reveals that these dendrimers have not yet been fully explored.

The Coming-Out Process in Family, Social, and Religious Contexts Among Young, Middle, and Older Italian LGBQ+ Adults

The coming out (CO) process is fundamental for identity integration among LGBQ+ people, and its impact can vary greatly depending on personal and contextual factors. The historical, cultural, and social contexts in which LGBQ+ people develop their sexual identity can mediate the relationship between CO and health outcomes. The present study aimed at clarifying the CO process in three generations of Italian LGBQ+ people (young adults: aged 20-40 years; middle adults: aged 41-60 years; older adults: aged 61-80 years) by providing data on: (a) sexual orientation milestones, such as age of first awareness, age of first self-label, and age of first CO, as well as the rate of disclosure during different life stages; (b) the rate and average age of CO to significant others; and (c) CO within the religious context and its effect on participants' minority stress experiences. A total of 266 Italian LGBQ+ people participated in the study, with ages ranging from 20 to 80 years (M = 41.15, SD = 16.13). Findings indicated that, on average, the older adult group became self-aware, self-labeled, and disclosed their sexual identity at a significantly older age than the other groups. Older adults were also more Catholic and had CO more frequently to their Catholic community, relative to young and middle adults. CO within the Catholic context was associated with distal and proximal minority stressors, such as discrimination, vigilance, and internalized sexual stigma. Catholic community reactions to participants' CO were distinguished through thematic analysis in three main types: unconditional acceptance, invitation to change, and open rejection. The present research extended current knowledge on CO and minority stress experiences in different generations of LGBQ+ people. Several differences emerged between generational groups on sexual orientation milestones, highlighting the potential impact of historical and cultural contexts in determining sexual minorities' experiences related to sexual identity. It is recommended that mental health professionals working with LGBQ+ clients implement targeted interventions based on their clients' multiple salient aspects, including age and religious background. Clinicians should also be aware of the potentially detrimental effects of CO within an unsupportive context, rather than encouraging CO tout court.

Long-lasting effects of antibiotics on bacterial communities of adult flies

Insect symbionts benefit their host and their study requires large spectrum antibiotic use like tetracycline to weaken or suppress symbiotic communities. While antibiotics have a negative impact on insect fitness, little is known about antibiotic effects on insect microbial communities and how long they last. We characterized the bacterial communities of adult cabbage root fly Delia radicum in a Wolbachia-free population and evaluated the effect of tetracycline treatment on these communities over several generations. Three D. radicum generations were used: the first- and second-generation flies either ingested tetracycline or not, while the third-generation flies were untreated but differed with their parents and/or grandparents that had or had not been treated. Fly bacterial communities were sequenced using a 16S rRNA gene. Tetracycline decreased fly bacterial diversity and induced modifications in both bacterial abundance and relative frequencies, still visible on untreated offspring whose parents and/or grandparents had been treated, therefore demonstrating long-lasting transgenerational effects on animal microbiomes after antibiotic treatment. Flies with an antibiotic history shared bacterial genera, potentially tetracycline resistant and heritable. Next, the transmission should be investigated by comparing several insect development stages and plant compartments to assess vertical and horizontal transmissions of D. radicum bacterial communities.

Consumers' Attitude towards the Sustainability of Different Food Categories

Currently, poverty, climate change, environmental pollution and the depletion of natural resources have generated a greater concern for sustainability. The objective is the survival of the human species and the persistence of all components of the biosphere. To achieve sustainability, human participation is essential; sustainable consumption depends on consumers’ perceptions of sustainability and how they affect their behavior. The aim of this study was to understand consumers’ perceptions and attitudes towards food sustainability based on country, age, gender, income and education level. An online survey was carried out in countries in Europe, America and Asia. Consumers were asked questions organized into food categories. The results showed that consumers’ attitude towards sustainability is understood differently in each country, even within the same food category. Consumers with lower education level showed the lowest knowledge and concern about food sustainability. Older generations were less aware of sustainability and its related problems. While income level presented unclear results, gender did not affect attitude towards food sustainability. Therefore, to achieve a sustainable future, raising awareness among the population is increasingly necessary. Consequently, segmenting training campaigns according to the group they are aimed at will provide a greater impact and, therefore, greater awareness.

Job Embeddedness: The Differences Between Registered Nurses and Healthcare Assistants

Retention of registered nurses (RNs) and health care assistants continue to be a challenge in acute care settings. This descriptive, comparative study examined differences of job embeddedness (JE) scores between RNs and health care assistants (HCAs) in acute care facilities. Generational differences for JE scores were also compared. A convenience sample of RNs and HCAs from medical and surgical units at two Texas hospitals completed the surveys. RNs valued community sacrifices significantly higher than HCAs. Total JE scores between baby boomers and millennials were significantly different, while organizational links scores among all three generations showed statistical significantly differences. Organizational fit, organizational sacrifice, and level of education added statistical significance to the prediction of job satisfaction.

Parenting Warmth and Strictness across Three Generations: Parenting Styles and Psychosocial Adjustment

Recent emergent research is seriously questioning whether parental strictness contributes to children’s psychosocial adjustment in all cultural contexts. We examined cross-generational differences in parental practices characterized by warmth and practices characterized by strictness, as well as the relationship between parenting styles (authoritative, indulgent, authoritarian, and neglectful) and psychosocial adjustment in adulthood. Parenting practices characterized by warmth (affection, reasoning, indifference, and detachment) and strictness (revoking privileges, verbal scolding, and physical punishment) were examined. Psychosocial adjustment was captured with multidimensional self-concept and well-being (life satisfaction and happiness). Participants were 871 individuals who were members of three generations of Spanish families: College students (G3), their parents (G2), and their grandparents (G1). Results showed two different cross-generational patterns in parenting practices, with an increased tendency toward parental warmth (parents use more affection and reasoning but less indifference across generations) and a decreased tendency toward parental strictness (parents use revoking privileges, verbal scolding, and physical punishment less across generations). Interestingly, despite cross-generational differences in parenting practices, a common pattern between parenting styles and psychosocial adjustment was found: indulgent parenting was related to equal or even better self-concept and well-being than authoritative parenting, whereas parenting characterized by non-warmth (authoritarian and neglectful) was related to poor scores.

Audiovisual Media Communications in Adult Education: The case of Cyprus and Greece of Adults as Adult Learners

Nowadays, audiovisual media technologies and audiovisual content (audiovisual media communications) play an important role in our physical/psychological health, education, and lifelong learning, causing the redefinition of the teaching methodology. As presented in the literature, the use of audiovisual media communications presuppose a new way of approaching effective teaching, which requires the educators on all educational levels and disciplines to display with competence many advanced skills and abilities. The aim of this research is to provide data that will contribute to the effective teaching utilizing audiovisual media communications in adult education. This research is a secondary research from two researches, which are qualitative and based on a quantitative method of analyzing. The primary data were collected through experiment method from adults (18 years and older), in Cyprus and Greece. The results confirm the current debate of using audiovisual media technologies within the educational process in technology-enhanced learning in education, both from the literature, and from the findings and results of various researches. This research is part of a larger, ongoing research that explores the multidisciplinary field that incorporates media, audiovisual content, and education (MACE), information and communications technologies (ICTs) in adult education (in Greece and Cyprus).

Meaning-Making of War Experiences: Stories From Kosova

The research evidence shows that war had many detrimental effects on the mental health, wellbeing, and social functioning of the people of Kosova, which is similar to the findings in many other postconflict societies. However, there are few studies focusing on the process of meaning-making of war experiences and their impacts on resilience and growth. This phenomenological study aimed to explore the lived war experiences of citizens of Kosova from the perspectives of three generations (grandparents, parents and children) through semistructured interviews, which were conducted with 37 participants. Thematic analysis revealed that the journey of the meaning-making of war experiences in Kosova is rather dynamic and reflects the context in which each generational cohort lived and grew. The findings provide a deeper understanding of the strategies used by each generation for meaning-making and how these strategies contributed to resilience and growth. The implications for mental health counselors, social workers, and policymakers are discussed.

The gendered relationship with drunkenness among different generations in Mediterranean and Nordic countries

The study adopts a qualitative comparative approach to better understand how different dimensions affect social norms regulating alcohol consumption. Female and male attitudes towards drunkenness were analysed on the basis of data from 27 focus groups involving a total of 166 participants from Italy, Finland and Sweden, grouped by age cohort (17–20 and 50–65 years) and educational level. Results suggest that gendered drinking norms may be affected more by the drinking culture than by the degree of gender equality, thus providing a possible explanation of why gender differences in drinking are not always consistent with broader gender inequalities.

On the future of the individual longitudinal age-crime curve

BACKGROUND

This article serves as our memorial for the outstanding contribution of Rolf Loeber to developmental criminology. His salient paper on the future of the study of the age-crime curve (2012) is the focal point.

AIMS

Follow some research trails that Rolf Loeber proposed in his 2012 paper.

METHODS

Recent data on official offending from the Montréal Two Samples Four Generations Cross-sectional and Longitudinal Studies (MTSFGCLS) are analysed. The data were gathered for two generations of juvenile court males; five birth cohorts born around 1960 and followed from age 8 to 61, and five birth cohorts born around 1980, males and females traced from age 12 to 45. The age-crime curves are presented for the total prevalence. Epidemiological data are displayed for career descriptors: number of years active in offending, frequency, variety, onset, offset and duration.

RESULTS

The age-crime curves of the two generations display the habitual shape reported in the literature. The epidemiological data shows that the population sample has a much lower curve in comparison to the court sample; this sort of difference is also observed between females and males.

CONCLUSION

The difference between the two generations in the age-crime curves are interpreted in light of three evolutions in Québec from 1960 to 2000: (a) a radical change in the delinquency law, social and criminal justice policies, and treatment for juvenile delinquents; (b) a reduction of the juvenile and adult crime rates; (c) a significant increase in the wellbeing of the population on education, health and welfare services.

The association between religiosity and pregnancy acceptability among Latino/a young adults: does generational status matter?

The US Latino/a population is considered to be at high risk for unintended pregnancy; some research indicates that Latino/a parents are more likely to express happiness about an unintended pregnancy than other racial/ethnic groups. Associations between pregnancy attitudes and factors such as religiosity and nativity have also been documented in the Latino/a population, but existing research is sparse, dated and primarily focused on women of Mexican heritage. This study sought to expand this literature by examining the relationship between religiosity and pregnancy acceptability and assessing effect modification by generational status and gender in a national sample of young Latino/a cisgender women and men of various ancestral backgrounds currently in relationships. In multivariable logistic regression models, there was a positive association between importance of religion and pregnancy acceptability for both men and women; being highly or moderately religious was associated with elevated odds of finding a pregnancy acceptable. Effect modification by generational status was significant for women, but not for men. Results suggest that religiosity, gender and generational status have differential influences on and relationships to pregnancy orientations for Latina women and Latino men and should be considered in the design and delivery of family planning care for Latino/a clients.

Dynamics of genomic architecture during composite breed development in cattle

Some livestock breeds face the challenge of reduced genetic variation, increased inbreeding depression owing to genetic drift and selection. Hybridization can reverse these processes and increase levels of productivity and adaptation to various environmental stressors. Samples from American Brangus were used to evaluate the indicine/taurine composition through nine generations (~45 years) after the hybridization process was completed. The purpose was to determine how hybridization alters allelic combinations of a breed over time when genetic factors such as selection and drift are operating. Furthermore, we explored genomic regions with deviations from the expected composition from the progenitor breeds and related these regions to traits under selection. The Brangus composition deviated from the theoretical expectation, defined by the breed association, of 62.5% taurine, showing taurine composition to be 70.4 ± 0.6%. Taurine and indicine proportion were not consistent across chromosomes. Furthermore, these non‐uniform areas were found to be associated with traits that were probably under selection such as intermuscular fat and average daily gain. Interestingly, the sex chromosomes were predominantly taurine, which could be due to the composite being formed particularly in the final cross that resulted in progeny designated as purebred Brangus. This work demonstrated the process of new breed formation on a genomic level. It suggests that factors like genetic drift, selection and complementarity shift the genetic architecture into a uniquely different population. These findings are important to better understand how hybridization and crossbreeding systems shape the genetic architecture of composite populations.

Zirconia and its novel compositions: What do clinicians need to know?

For several years, there has been a clear trend in the dental market towards monolithic tooth-colored restorations. In this context, further developments, particularly in the field of zirconia ceramics, have led to considerable improvement in the materials' optical properties. Modern zirconia materials can be divided into several cohorts, differing from each other with respect to their optical and mechanical properties. The knowledge about indications and limitations of each zirconia cohort is essential for a correct clinical application. Clinical long-term experience for the zirconia of the newest generations is still scarce and only in-vitro data are available. Despite all advancements, clinical long-term success remains closely linked to the specific indications, preparation, material selection, knowledge, and experience of the dental practitioner and dental technician, as well as an adequate luting mode and occlusal concept. Due to the high innovation rate within materials and CAD/CAM technology in general, clinicians and dental technicians need to be well informed in order to be able to work successfully with the various options.

A study of Genomic Prediction across Generations of Two Korean Pig Populations

Simple Summary

Commercial genotyping has become accessible at a relatively low cost and nowadays it is widely used by breeders to predict production and economic traits. Many studies explored the benefits of using DNA information in breeding programs, and many methods have been established to optimize the use of such information. To date, however, very few studies have explored how prediction accuracies change across generations. Here we present a short evaluation across five generations in two pig breeds and evaluate the accuracy of the prediction of relevant production traits using different generational groups.

Abstract

Genomic models that incorporate dense marker information have been widely used for predicting genomic breeding values since they were first introduced, and it is known that the relationship between individuals in the reference population and selection candidates affects the prediction accuracy. When genomic evaluation is performed over generations of the same population, prediction accuracy is expected to decay if the reference population is not updated. Therefore, the reference population must be updated in each generation, but little is known about the optimal way to do it. This study presents an empirical assessment of the prediction accuracy of genomic breeding values of production traits, across five generations in two Korean pig breeds. We verified the decay in prediction accuracy over time when the reference population was not updated. Additionally we compared the prediction accuracy using only the previous generation as the reference population, as opposed to using all previous generations as the reference population. Overall, the results suggested that, although there is a clear need to continuously update the reference population, it may not be necessary to keep all ancestral genotypes. Finally, comprehending how the accuracy of genomic prediction evolves over generations within a population adds relevant information to improve the performance of genomic selection.