• Journal of the Korean Academy of Child and Adolescent Psychiatry
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• v.27 no.1
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• pp.48-55
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• 2016

Objectives: Children with attention-deficit hyperactivity disorder (ADHD) may have deficits in time perception, as assessed by the time estimation task and the time reproduction task, however its age-related trajectory is not yet determined. Therefore we examined the correlation between accuracy of time perception tasks and age, and the association between accuracy of estimation tasks and reproduction tasks. Methods: Sixty-three patients with ADHD, aged 8 to 18 years tested the tasks for five time durations (2, 4, 12, 45, and 60 seconds). Accuracy of tasks was assumed differences (absolute values) between raw results of tasks and original time durations. Spearman's correlation analysis was performed to determine correlation between accuracy of time perception tasks and age. Multivariate regression was used to determine the association of accuracy of estimation tasks with accuracy of reproduction tasks. Results: Age showed correlation with accuracy of estimation tasks, but not with that of reproduction tasks. We observed that the higher the accuracy in 12, 45, and 60 seconds duration time reproduction, the higher the accuracy in longer seconds duration time estimation. Conclusion: Age was correlated with time estimation accuracy whereas there was no impact on time reproduction accuracy. Association of each of the two time perception tasks, particularly in longer time duration, suggested specific impairments in time perception.

• Korean Journal of Animal Reproduction
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• v.21 no.4
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• pp.411-421
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• 1997

A survey was carried out to investigate the symptoms and occurance of reproductive disorder in Hanwoo(Korean native cattle). Data of the reproductive disorder of 561 heads from 28 farm households have been collected from Dec. '95 to Nov. '96 and analyzed calving no, nutritional body condition and housing forms. The results obtained are summarized as follows: 1. The incidence of reproductive disorder was 20.1% and the major common symptoms were repeat breeding(39.8%), anestrous(31.0%), nymphomania(10.6%) and subestrous(8.9%). 2. The incidence of reproductive disorder according to the calving no., that of heifer, calved one to two calving no. and over three calving no. were 20.6%, 13.9% and 34.5%, respectively. 3. Reproductive disorder incidence according to the nutritional body condition was 18.3%, 14.6% and 48.7% at body condition score(BCS) less than 2.0, 2.5 to 3.0 and over than 3.5, respectively. At BCS over 3.0, the symptoms of common reproductive disorder were repeat breeding(17.6%), anestrous(12.2%), nymphomania(10.8%) and subestrous(2.7%). 4. The incidence of reproductive disorder according to the housing form 15.8% and 34.6% for group feeding in open house and individual stanchion feeding in stall, respectively. In group feeding, reproductive disorder incidence of cows raised in space of more than 9.9$m^2$ per head was 14.1%, while that of cows raised less than 9.9$m^2$ per head was 18.2%. And incidence of repeat breeding, aneestrous and subestrous was more frequent in individual stanchion feeding than group feeding.

• Korean Journal of Animal Reproduction
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• v.10 no.1
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• pp.9-18
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• 1986

Breeding and infertility status of Holstein cows reared in pasture of High-land was investigated. The results obtained were summarized as follows; 1. Eight hundred and forty Holstein cows with heifers (12.4%), 3 years old cows (19.3), 4 years old cows (16.7%), 5 years old cows (12.5%), 6 years old cows (11.4%), 7 years old cows (13.2%), 8 years old cows (9.4%) and above 9 years old cows (5.1%) were investigated. 2. They were 72.4% of conceived cows, 8.2% of uncertain pregnancy, 7.7% of physiological empty and 11.7% of reproductive disorder. 3. The percentage of cow concepted with 1, 2, 3 and more than 4 times of A.I. was 49.2, 28.8, 14.6 and 7.4% respectively. 4. In the nutritional condition of infertile cows, excellent, good, fair and poor was 7.1, 30.6, 36.7 and 25.5%, respectively. 5. Among 98 infertile cows, distribution of reproductive disorder was 41.8, 37.8, 5.1, 5.1 and 11.2% in ovary, uterus, vagina, oviduct and others, respectively. Ovary showed higher percentage than any other reproductive organs. Among the ovarian syndromes, lutein cystic ovary, follicular cystic ovary, and persistent corpus luteum were 31.7, 26.8 and 19.5%, respectively. 6. Four years old cow showed highest distribution (16.4%) among the aged groups in disordered cows. In the syndromes of reproductive disorder, latent endometritis showed higher frequency (14.3%) than any others. 7. Infertile cows with complex syncrome of genital disease was 29.6%.

• Korean Journal of Animal Reproduction
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• v.12 no.3
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• pp.148-155
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• 1988

Holstein cows being raised in the Kangweon district were examined on the breeding status and occurrence of reproductive disorder. The results obtained were as follows; 1. The cows above six years old in the alpine area were raised more than those in high level zone and plate zone. 2. A total of 1,350 Holstein cows were examined on the breeding status. They were 71.9% conceived cows, 7.9% of uncertain1$\frac{1}{2}$ regnancy, 7.0 of physiological vacancy and 13.3 of reproductive disorder. 3. The percentage of cows conceived by 1, 2, 3 and more than 4 times of A.I. was 49.9, 29.2, 13.3 and 7.6, respectively. 4. In the nutritional condition of infertile coes, excellent, good, fair and poor were 6.7, 30.2, 34.1 and 29.1, respectively. In the good and fair nutritional condition, the cows of ovarian syndrome were 15.6% of persistent corpus luteum, and 11.7% of follicular cystic ovary and lutein cystic ovary, respectively. 5. Among 179 inferTile cows, distributions of reproductive disorder were 43.0, 39.1, 3.9, 3.9 and 10.1% in ovary, uterus vagina, oviduct and others, respectively. Ovary showed higher percentage than any other reproductive organs. Among the ovarian syndromes, follicular cystic ovary, lutein cystic ovary and persistent corpus luteum were 28.6, 28.6 and 23.4%, respectively. 6. A cow group of six and seven-year old showed the highest percentage(21.0% and 23.3%) among the age groups in infertile cows. In the syndrome of reproductive disorder, catarrhal endometritis, latent endometritis, follicular cystic ovary and lutein cystic ovary were 14.5, 14.0, 12.3 and 12.3%, respectively. 7. Infertile cows with complex syndrome of genital disease was 31.8%.

• Development and Reproduction
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• v.16 no.3
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• pp.169-175
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• 2012

Angelman syndrome (AS) is a neurodevelopmental disorder characterized by intellectual disability and autism. The genetic cause is the absence of UBE3A, an E3 ubiquitin ligase, from the maternal chromosome which can arise from multiple origins. Recently discovered targets of Ube3a are important for activity dependent changes in synaptic transmission and spine morphology. Plasticity studies in an AS mouse model is important for basic plasticity research with regard to understanding protein homeostasis as well as the search for therapeutic targets for the patients. The progress on synaptic plasticity from this unique disorder is reviewed.

• Korean Journal of Veterinary Research
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• v.62 no.2
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• pp.15.1-15.8
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• 2022

The objective of this study was to identify risk factors for repeat breeder dairy cows and their impact on reproductive performance. The characteristics of 1,504 cows, including their peripartum health, nutrition, production, and reproduction, were collected. Cows with metabolic disorder were significantly more likely (odds ratio [OR], 2.47; p < 0.001) and cows with clinical endometritis tended to be more likely (OR, 1.35; p < 0.1) to become repeat breeders than cows without metabolic disorder and clinical endometritis, respectively. Cows initially inseminated > 80 days after calving were less likely (OR, 0.78; p < 0.05) to become repeat breeders than cows initially inseminated ≤ 80 days after calving. As a result, repeat breeding in dairy cows resulted in a 90 day longer (p < 0.0001) mean interval from calving to pregnancy. In conclusion, postpartum metabolic disorder, clinical endometritis, and a short interval from calving to initial insemination were risk factors for repeat breeder dairy cows, resulting in a severely impaired reproductive performance.

• Journal of Animal Reproduction and Biotechnology
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• v.35 no.3
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• pp.265-267
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• 2020

The congenital head anomalies are most often used to describe defects in the eyes, mouth, nose, skull, and or brain. The faulty embryogenesis most likely found to be associated with abnormal genetic or epigenetic causes during pregnancy. Eventually it leads to congenital anomalies. Rabbit-headed Lamb (RH) is a disorder in sheep breeding that is characterized by some deformities in the head and the face. A dead -day old- crossbred white Najdi lamb with a deformed face and head was reported to be born in the current case. The external and physical examination revealed a deformed skull and facial region with a unilateral eye, fused mouth, pig-like nose, and patent skull with the brain coming out from left eye orbit. Additionally, the lamb was very skinny with unusual long extremities. This is the first report of this syndrome that describes such deformities in a stillbirth Najdi breed lamb.

• Korean Journal of Animal Reproduction
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• v.12 no.1
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• pp.20-23
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• 1988

The 3211 Korean native cows raised in Muan, Milyang were investigated for the purpose of finding reproductive rate of cows that retained fetal membrane for two years from April, 1981 to March, 1983. The results obtained were summarized as follows ; 1. The incidence of retained fetal membrane was found in 64 cows(1.98%). 2. The day to first estrus was similar to normal postpartum period unless concurrent genital infection occured. 3. Conception rate of cows that retained fetal membrane was 32.7%, 10.9%, 5.2% and 3.6% at the first, second, third and forth service, respectively and non pregnant cow was 47.6%. 4. Reproductive disorder of non pregnant cows was the highest in repeat breeder and the effect of treatment was very low.

• Journal of Animal Reproduction and Biotechnology
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• v.37 no.2
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• pp.144-148
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• 2022

Imperforate hymen is a rare congenital disorder that may predispose to retention of fluid in the vagina and uterus, thereby resulting in conditions such as hematocolpos, pyocolpos, and pyocolpometra in female dogs. A 7-year-old intact female shih tzu exhibiting abdominal distension, depression, anorexia, dysuria, dyschezia, and tenesmus was diagnosed with pyocolpos; a 9-year-old intact female Yorkshire terrier with abdominal mass, dysuria, and tenesmus was diagnosed with hematocolpos; and a 7-year-old intact female shih tzu with dysuria, dyschezia, anorexia, and vomiting was diagnosed with pyocolpometra. Ovariohysterectomy and partial vaginectomy were performed, and the blind end of the vaginal stump was omentalized. This clinical report provide diagnostic process and surgical treatment option for congenital vaginal obstruction cases.

• Clinical and Experimental Reproductive Medicine
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• v.51 no.2
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• pp.142-150
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• 2024

Objective: Diminished ovarian reserve (DOR) is a disorder characterized by impaired ovarian function. Sleep disorders are disruptions of the circadian rhythm, which appears to be closely linked to reproductive systems. This study aimed to investigate the impact of poor sleep quality on the ovarian reserve of childbearing-age women. Methods: A cross-sectional study was conducted in China from June 2021 to March 2023. In total, 102 participants diagnosed with chronic insomnia disorder were included in the study. Questionnaires were administered to assess participants' menstrual patterns, insomnia severity, anxiety, and depression. The anti-Müllerian hormone level and the basal antral follicle count were measured for ovarian reserve evaluation. Correlation analysis and ordinal logistic regression analysis were conducted. Results: The women with insomnia presented high percentages of hypomenorrhea, premenstrual syndrome, and dysmenorrhea (78.4%, 74.5%, and 46.1%, respectively). Severe sleep disorder in the past month was identified as an independent risk factor for hypomenorrhea and premenstrual syndrome (odds ratio [OR], 2.64 and OR, 2.688; p<0.05). The prevalence of DOR among women with insomnia (33.3%) was significantly higher than the average reported in previous studies for young women. Insomnia duration exceeding 1 year was determined to be an independent risk factor for DOR in women aged 36 to 40 years (OR, 4.5; p=0.033). Conclusion: This study highlights the association between sleep disorders and menstrual problems. Prolonged poor sleep quality in women aged 36 to 40 years was identified as a significant risk factor for DOR. We should pay more attention to improving sleep quality in order to maintain normal ovarian function.