• Reproductive and Developmental Biology
• /
• v.32 no.1
• /
• pp.51-58
• /
• 2008

This study was performed to investigate the relation between birth weight and survivability on the production of cloned Hanwoo calves. The 580 cloned embryos were transferred into the 293 recipients. The pregnancy rate of the cloned embryos was 72.3% at 50 days after embryo transfer, and then the rate was dramatically decreased. The mean gestation lengths were 287 days in both clone (range of$279{\sim}295$ days) and artificial insemination (AI, range of $255{\sim}293$ days) calves, respectively. The mean birth weight of cloned calves (30.3kg) was significantly higher compared to that of AI calves (23.7kg) (p<0.05). Among the cloned calves, the birth weight was not different in both normal delivery (n=17, 29.9kg) and caesarean section (n=14, 32.3kg). The weight, however, was significantly higher in the clones (n=18, 32.8kg) dead within 175 days than that of the clones (n=11, 28.3kg) alive more than 175 days after birth (p<0.05). Interestingly, all cloned calves weighed <15kg (n=5) or >35kg (n=9) at birth have been dead within 175 days from the date of birth. The causes of death in the cloned calves were premature birth (n=2, 10.0%), abnormal function of lung and liver (n=2, 10.0%), abnormal function of lung (n=4, 20.0%), malformation (n=4, 20.0%), unknown (n=4, 20.0%), and sudden death syndrome (n=4, 20.0%), respectively. Our findings suggest that normal birth weight is one of the most important factors to survive more than 6 months in cloned calves.

• Animal cells and systems
• /
• v.6 no.3
• /
• pp.247-252
• /
• 2002

The effect of paraquat (PQ, 1,1＇-dimethyl-4,4＇-bipyridium) on the histogene-sis and glycoconjugates (GCs) properties of the pyloric region of the stomach in a perinatal rat was examined by histological and histochemical methods. Oral administration of PQ (9 mg/kg per day in 0.2 mL of D.W.) on 7 to 14 days of gestation revealed growth retardation with significant reductions in the length of pyloric gland and their pit. As for histochemical properties of GCs in the pyloric region of the stomach, the PQ-treated rats showed some differences, such as delayed initial appearance of the sulfated GCs and lectin affinities compared with the vehicle group. These different GCs properties in the surface and gastric pit were usually detected in the fetal rats and more prominent and evident differences were revealed in the gland epithelium of the early postnatal rat. These results suggest that maternal PQ administration causes intrauterine growth retardation asso-ciated with delayed histogenesis and GCs immaturation of pyloric mucosa in developing rat.

• Clinical and Experimental Pediatrics
• /
• v.54 no.11
• /
• pp.443-455
• /
• 2011

Neonatal mortality rate (NMR) or infant mortality rate (IMR) are the rate of deaths per 1,000 live births at which babies of either less than four weeks or of one year of age die, respectively. The NMR and IMR are commonly accepted as a measure of the general health and well-being of a population. Korea's NMR and IMR fell significantly between 1993 and 2009 from 6.6 and 9.9 to 1.7 and 3.2, respectively. Common causes of infantile death in 2008 had decreased compared with those in 1996 such as other disorders originating in the perinatal period, congenital malformation of the heart, bacterial sepsis of newborns, disorders related to length of gestation and fetal growth, intra-uterine hypoxia, birth asphyxia. However, some other causes are on the increase, such as respiratory distress of newborn, other respiratory conditions originating in the perinatal period, other congenital malformation, diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism. In this study, we provide basic data about changes of NMR and IMR and the causes of neonatal and infantile death from 1983 to 2009 in Korea.

• Asian-Australasian Journal of Animal Sciences
• /
• v.33 no.2
• /
• pp.197-202
• /
• 2020

Objective: The objective of this study was to identify environmental factors strongly associated with and to estimate genetic parameters of reproductive traits in Japanese Black heifers. Methods: Data included reproduction records of Japanese Black heifers born between 2004 and 2014. First service non-return rate (NRR) to 56 days from first to successful insemination (FS), number of services per conception (IN), age at first calving (AFC) and gestation length were analyzed with the use of the general linear model. Genetic parameters were estimated with the use of the univariate animal model of the residual maximum likelihood. Results: Averages of reproductive traits over eleven years were assessed, and the effects of farm, year, month, artificial insemination technician and interaction of farm×year on the traits were determined. Estimated heritability of FS was very low and that of AFC was higher than that of the other traits. A close genetic relation was observed among NRR, IN, and FS; however, their heritabilities were very low. AFC shows favorable genetic correlation with IN and FS. Conclusion: Low heritabilities of most reproductive traits in Japanese Black heifers are strongly influenced by farm management practices, and that large residual variances make genetic evaluation difficult. Among the reproductive traits, AFC is potentially more useful for genetic improvement of heifer reproductive traits because it has high heritability and favorable genetic correlations with IN and FS.

• Korean Journal of Fisheries and Aquatic Sciences
• /
• v.49 no.3
• /
• pp.404-409
• /
• 2016

We investigated the maturation and spawning of Sebastes thompsoni in the coastal waters off Ulleungdo, based on samples collected by gill net from March 2013 to February 2014. We analyzed monthly changes in maturity stage, gonadosomatic index (GSI), egg diameter, fecundity, and total length (TL) at 50% group maturity. The average TLs of female and male S. thompsoni were 22.6 cm and 22.5 cm, respectively. The main parturition period of females was during March and April. The GSI of females began to increase in January, and reached a maximum in March. The GSI of male reached a maximum between January and February. The spawning period of males was shorter than that of females. The egg diameter during gestation stage was 1.4±2.1 mm. The TL of females at 50% group maturity was 22.3 cm.

• Korean Journal of Animal Reproduction
• /
• v.17 no.1
• /
• pp.35-41
• /
• 1993

The study was conducted to investigate the effects on environmental factors on the reproductive performance of Korean native cattle based on the data from 13, 588 records which were surveyed from 1983 to 1992. The results obtained in this study are as follows; 1. Mean performaces of the reproductive traits were 510.2days for the age at 1st service, 525.0days for the age at 1st conception, 808.7 days for the age at 1st calving, 102.5 days for the days to 1st conception postpartum and 388.6 days of the calving inverval. The cows of Chunbuk province were tended to be bred and calved at younger age and showed shorter calving interval than those of other provinces. 2. The effect of birth year was significant for the reproductive performances, especially, in 1986~1987 when the cattle prices dropped sharply and reproductive performances were poor. 3. The times of 1st service and 1st conception of heifers calved in spring tended to be delayed. Days to 1st conception postpartum, calving interval and days to 1st service postpartum of cows calved in fall were shorter than other calving season's cows. 4. Days to 1st conception postpartum, calving interval and days to 1st service postpartum of cow's were shortened and gestation length was prolonged as the number of parity increases.

• Korean Journal of Veterinary Service
• /
• v.35 no.3
• /
• pp.207-213
• /
• 2012

The trunk conformations of the Gyeongju Donggyeongi (GD), Korean native dog was measured in the present study. Also, the information of reproductive activity was investigated in GD dogs. A total of 73 dogs were randomly selected out of 121 dogs in the Gyeongju County in July 2010, which were registered by inserting electronic chips in the withers. The hair colors of the GD were white, yellow, black and tiger brindle, the mean withers heights were $45.46{\pm}4.17cm$ and $49.28{\pm}3.56cm$ for female and male dogs, respectively The mean body length to withers height ratios were 117.63% and 116.4% for the female and male dogs. Concerning the reproductive capability of the GD, the mean litter number was $4.6{\pm}1.7$, the optimal mating time was $12.5{\pm}2.3$ days after the rutting season and the mean gestation period was $60.2{\pm}2.8$ days. The results of this study would be useful for compiling the official standard for the adult GD.

• Journal of Nutrition and Health
• /
• v.32 no.2
• /
• pp.182-188
• /
• 1999

A study was conducted on a group of 107 women, attending the three peripheral community clinics in Seoul and Kyunggi area for their prenatal care, to ascertain the relationship between maternal serum zinc concentration measured in pregnancy and several pregnancy outcomes. The serum zinc concentration was adjusted for estimated gestational age at the time of drawing blood. Mean daily zinc intake of the pregnant women estimated by a 24-hour recall method was 7.68$\pm$3.70$\mu\textrm{g}$/dl, 51% of RDA. and mean serum zinc concentration of the women was 94.03$\pm$36.99ug/dl. Adjusted maternal serum zinc level was significantly related to gestational maternal weight gain(p<0.05) and infant birth weight(p<0.05). Pregnant women with tgreater than 9kg weight gain during the gestation period had higher adjusted serum zinc levels than the subjects with less than 8kg weight gain. Adjusted serum zinc levels of mothers who delivered 3.0-3.5kg and greater than 4.0kg birth-weight infants were higher than those of mothers of low-birth-weight infants. Any association between maternal serum zinc level and gestational length, complications and morning sickness was not observed. There results suggest that the maternal serum zinc level may predict perhaps the author could be none specific.

• Child Health Nursing Research
• /
• v.27 no.4
• /
• pp.317-327
• /
• 2021

Purpose: This study aimed to identify small for gestational age (SGA) infants' growth patterns, nutritional status, and associated factors. Methods: This prospective cohort study was conducted at primary-care child health clinics in Greater Kuala Lumpur, Malaysia. The sample consisted of infants who fulfilled the criteria and were born in 2019. The anthropometric data of infants were assessed at birth and at 1, 3, 6, 9, and 12 months. Results: A total of 328 infants were analysed. In total, 27.7%(n=91) of the subjects were SGA infants, and 237 of them were not. Significant differences in the median weight-for-age and length-for-age z-scores were observed between SGA and non-SGA infants at birth, 1 month, 6 months, and 12 months. There was a significant difference between the growth patterns of SGA and non-SGA infants. Birth weight and sex significantly predicted the nutritional status(stunting and underweight) of SGA infants during their first year of life. Conclusion: SGA infants can catch up to achieve normal growth during their first year of life. Even though the nutritional status of SGA infants trends worse than non-SGA infants, adequate infant birth weight monitoring and an emphasis on nutritional advice are crucial for maintaining well-being.

• The korean journal of orthodontics
• /
• v.18 no.2
• /
• pp.329-342
• /
• 1988

In methods of finding causes for cleft palate, many cases have been studied by investigators using teratogenic agents. Among them, a synthetic agent known as triamcinolone acetonide (TA) was widely used. When this drug was injected into mice during palatogenesis, it induced lowered body weight and a deformed mandible. But many cases have been studied on growth changes, only of the developmental stages of the palate. Therefore, the objective of this study was to evaluate craniofacial growth in experimentally induced cleft palate mice after finishing palatogenesis namely just before birth. Normal, alcohol treated, and TA treated DDY mice were obtained at 18-days of gestation and heads were prepared for serial sectioning in the sagittal plane. The midsagittal sections were photographically enlarged (${\times}40$) and measurements made to asses the amount of growth. The obtained results were as follows. 1. The incidence of cleft palate was 41.2% when TA was injected. 2. The body weight of the cleft palate group was lower than the control group. 3. In the cleft palate group, mandibular length (H-M) was lighter than the control group. 4. In the cleft palate group, degree of staining was not distinct compared to the control group by the double staining method. 5. In the cleft palate group, anteroposterior posture of the tongue tip to facial plane (C-M) was more posterior than the control group. 6. The cause of posterior posture of the tongue tip to facial plane (C-M) in the cleft palate group, was not short and retracted tongue but the mandibular length was increased. 7. The anteroposterior relationship of hyoid cartilage to cranial base was the same in all groups.