• Korean Journal of Agricultural Science
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• v.49 no.1
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• pp.19-29
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• 2022

The present experiment was conducted to evaluate the effects of single-sex or mixed rearing on the growth and laying performance, blood parameters, egg quality, and feather scores of laying hens in an aviary system. A total of 2,928 (females, 2,856; males, 72), Hy-Line Brown chickens at 20 weeks were evenly assigned to two treatments: termed here the single-sex (only female) and mixed-sex (female to male 20 : 1) conditions. They were allowed an ad libitum diet for 20 weeks in an aviary system. There were eight replicates of each treatment, each consisting of 12.42 m²·birds^-1 (n=183), respectively. The body weight and uniformity in the mixed-sex condition were higher than those in the single-sex condition, but egg production did not show any significant differences between the two types of treatment for 20 weeks. The mixed-sex group showed an effect through stress parameters (corticosterone), whereas the feather score on the back was low at the end of the experiment. These results suggest that the presence of males affect corticosterone level for mating but can reduce the vigilance and aggressive behavior of laying hens.

• The korean journal of orthodontics
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• v.9 no.1
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• pp.67-84
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• 1979

The author measured the right and left craniofacial skeleton using posteroanterior cephalography of 124 male and 97 female subjects of ages ranging 2-6 years, 7-13 years and adult group on Korean. Statstical parameters were calculated by computer from the data. The results of the study were as follows. 1. In the male and female group of deciduous dentition, the right side measurements were slightly greater than the left side measurements, and generally male measurements were greater than female measurements. 2. In the both sex group of mixed dentition, the right side measurements were greater than the left side measurements, and in comparision of sex, the female recognized more growth, and development than male, especially on the cranial base, lateral maxilla, lower maxilla and dental region. 3. In the permanent dentition group, regardless of sex, the right side measurements were greater than the left side measurements, and in the sex difference, male was conspicuously greater than female on both sides measurements. 4. In the permanent dentition group, the asymmetry of the face was striking than deciduous dentition and mixed dentition group.

• Journal of Animal Environmental Science
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• v.17 no.2
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• pp.107-114
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• 2011

This study was designed to determine the effect of season and split-sex feeding on performance, stress and carcass quality of finishing pigs. Two hundred and seventy cross-bred finishing pigs $(82.1{\pm}0.82kg)$ were randomly divided into six groups in 2 seasons (summer and winter) ${\times}$ 3 split-sex feeding (female only, castrated male and mixed) factorial arrangement of treatments. In winter, feed intake and weight gain of finishing pigs were better than summer (p<0.05). Split-sex feeding was affected the feed conversion, feed conversion of finishing pigs were superior in winter and mixed groups. Plasma concentrations of cortisol as a stress indicators was greater in the mixed groups vs female only and castrated male groups. There were no interactions between the season and split-sex feeding in their effects on these blood variables. The season was affected the carcass characteristics and PSE incidence of the finishing pigs, PSE incidence was low in winter and mixed groups. Meat quality did not show any significant difference due to the difference of season and split-sex feeding of finishing pigs. There was no significant difference in the pH, drip loss and meat color of pork loin between the season and split-sex feeding of finishing pigs. In conclusion, the results of this study suggest that we need more precise on-farm management practice in summer and application of split-sex feeding skills to reduce the stress and improve welfare status of finishing pigs.

• Korean journal of applied entomology
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• v.60 no.1
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• pp.71-78
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• 2021

Trapping efficacy of lures obtained by mixing sex pheromone attractants of two or three species in a single dispenser were evaluated in peach and apple orchards for three lepidopteran fruit borers, Grapholita molesta (GM), Carposina sasaki (CS), and Conogethes punctiferalis (CP) which use different chemicals as their sex attractants. In the peach orchard, the trapping efficacy of the mixed lures of GM and CS attractants were reduced for GM trapping, compared with the single GM lure. The population fluctuation patterns of GM were highly correlated between the single lure and all the mixed lures. In the apple orchard, the efficacy of all the mixed lures were not reduced for GM trapping. The trapping efficacy of all the mixed lures for CS trapping were not reduced compared with the CS single lure in both the peach and apple orchards. In the peach orchard, the population fluctuation patterns of CS were highly correlated between the single lure and the mixed lures. The efficacy of the mixed lures for CP trapping could not be determined because of the small number of caught samples. The results indicated that mixed lures could be utilized for monitoring of the annual adult emergence of two species, GM and CS.

• Journal of the Korean Home Economics Association
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• v.44 no.10
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• pp.35-45
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• 2006

The purpose of this study was to investigate preschoolers' entry behaviors into a play group and the responses of the play group in relation to the structural characteristics of the group in a natural situation. The entry behaviors of 43 preschoolers and the responses of the play group were time-sampled. In addition the structural characteristics, including size and sex composition of the play group, and existence of a friend in the group, were checked. The following results were obtained. (1) The subjects used frequently participating behavior and wandering behavior among their entry behaviors. The wandering behavior increased and the participating behavior decreased as the size of the play group increased. Also, the subjects used wandering behaviors in the mixed group more than in the same-sex group or opposite-sex group. There was no difference in the entry behaviors according to the existence of a friend in the group. (2) The play group ignored 56% of the entry behaviors, and accepted 38% of them. The positive response of the group increased with decreasing size of the play group, whereas the entry bids were increasingly ignored as the size of the group increased. The mixed group ignored the entry bids more than the same-sex or opposite-sex group did. Also, in the presence of a friend in the group, the play group responded more positively than the group with no friend did.

• Child Studies in Asia-Pacific Contexts
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• v.3 no.1
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• pp.13-31
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• 2013

The children of sex workers in Bangladesh are denied even the most basic human rights. This article is based on recent research focused on the children of sex workers in the context of their everyday lives. The study focused on access to education and how education could be a vehicle for them to break the vicious cycle of exploitation. This was a mixed method interpretative study which employed qualitative and quantitative approaches, but in this paper only qualitative data which was generated through in-depth interviews and focus group discussions is used. Data was collected from sex workers, their children, teachers and NGO workers who participated in the study. Information has been collected for analysing the expectation of the children of sex workers and hope for the future, and the opportunities available to them during their schooling. Thematic analysis technique was used to understand the challenges and barriers faced by the children of sex workers in fulfilling their educational aspirations. The lives of the children of sex workers are marginalised by the mainstream society. Though it is very difficult to break the vicious cycle of exploitation, this research finds that education may be a stepping stone for them to create a better future. However, it is argued that the children of sex workers need income generating vocational and technical education to enable them to earn and support their family. Policy recommendations have been made in order to achieve Education For All targets and Millennium Development Goals, and to provide a second chance for these vulnerable young people to have a better life.

• Clinical and Experimental Pediatrics
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• v.48 no.12
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• pp.1317-1323
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• 2005

Purpose : This study was performed to evaluate the recent frequency of karyotypes in different sex chromosome abnormalities and to evaluate the age and clinical manifestations at diagnosis. Methods : Peripheral blood leukocytes were obtained from subjects who were clinically suspected to have sex chromosome abnormalities and referred to the cytogenetic laboratory in the Department of Pediatrics, Kyungpook National University Hospital from February 1981 to August 2001. Results : The relative frequencies of different sex chromosome abnormalities were Klinefelter(52 percent), Turner(42 percent), XXX syndrome(3 percent) and mixed gonadal dysgenesis(3 percent). The populations of different karyotypes in Klinefelter syndrome were 47,XXY(97 percent) and 46,XY/47,XYY(3 percent). The populations of different karyotypes in Turner syndrome were 45,X(67 percent,), mosaicism(23 percent), and structural aberrations(10 percent). The populations of different karyotypes in XXX syndrome were 47,XXX(67 percent,) and 46,XX/47,XXX(33 percent). All mixed gonadal dysgenesis were 45,X/46,XY. Eighty one percent of sex chromosome abnormalities was diagnosed after puberty. Patients diagnosed with Klinefelter and Turner syndrome in infancy showed nearly normal phenotypes or had minor congenital malformations. Conclusion : Early diagnoses of sex chromosome abnormalities is required to prevent associated morbidities and to maximize growth and development. We have to pay careful attention in diagnoses of Turner syndrome because of the high proportion of mosaicism and structural aberrations.

• Korean Journal of Human Ecology
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• v.1 no.2
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• pp.48-60
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• 1998

The purpose of this study was to investigate the relational between elderly women＇s sex-role attitude and their marital satisfaction. For this purpose, a questionnaire was surveyed 186 elderly women living in Kwangiu and Chonnam. The collected data were analyzed by using frequency, percentage, mean, standard deviation, ANOVA and stepwise regression analysis. The results of this research were as follows ; First The total points of the elderly women＇s sex-role attitude score was 16.4, which was represented mixed trends of traditional and modem. And the total points of the elderly women＇s marital satisfaction score was 31.6, which was higher than the median 30. Second, Elderly women＇s sex-role attitude score was meaningfully different according to education level, health state, economic state. And elderly women＇s marital satisfaction score was meaningfully different according to social activity, economic state, health state, education level, age. Third, As the results of regression analysis, it was shown that the highest influencing variable on their marital satisfaction was the social activity, economic state, education level. All of them explained 19% of their marital satisfaction. (Korean J Human Ecology 1(2):48-60, 1998)

• Proceedings of the Korea Society of Poultry Science Conference
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• 2001.11a
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• pp.74-76
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• 2001

Comparing to mammals, male bird has the homozygote ZZ and female has the heterozygote n. Therefore, the sex of fertilized eggs is defined by female chromosome constitution. Although this cytological observation had been established, the molecular and cellular mechanism of germ cell differentiation are essentially unknown in aves. Especially, the differentiation of germ cells in mixed-sex chimeras has not yet been clearly elucidated. Primordial germ cells, which are the progenitors of sperm or egg after sexual maturity, firstly arise in the epiblast and migrate to embryonic gonads through the blood vessel. During the embryo development, these PGCs differentiate in the pathway of mate or female, respectively and develop the sperm or egg cells after sexual maturity. In this paper, we confirmed that the female PGCs could migrate into the recipient male gonads after transferring and differentiate into germ cells in the embryonic stages. The primordial germ cells were isolated from the female embryonic gonads of 5.5-day-old incubation and re-injected into the male recipient embryos of 2-day-old incubation, which produced mixed-sex chimera in the germline. The finding in this study demonstrated the ability of migration and differentiation of gonadal primordial germ cells in mixed-sex chicken.

• Journal of the Korean Society of School Health
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• v.32 no.1
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• pp.20-31
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• 2019

Purpose: The purpose of this study is to examine the satisfaction level toward school sex education and its effect on character cultivation by reconstructing a unit, sex and health, included in the current health education curriculum. Methods: The study is a mixed research which utilized both two-way ANOVA & MANOVA methods, and qualitative content analysis. A total of 279 middle school students participated in the pre-test and the sex education program using the reconstructed curriculum. Then, a total of 253 participated in the posttest. Results: The results showed an increase in the satisfaction level toward school sex education (p<.05) and in character (p<.05) in both male and female students. There was no significant difference between male and female students. In the total test for character cultivation, there were no interacting effects between the test and gender (p>.05). Also, in the qualitative analysis, the program helped students to build character including self-care skills Conclusion: By revising the unit of sex and health to meet the needs and demands of the students, curriculum reconstruction increased the students' satisfaction and had a positive effect on their character cultivation.