Ji-Woong Lee

A Study on Estimation of Individual Growth Curve Parameters and their Relationships with Meat Quality Traits of Crossbred between Korean Native Boars and Landrace Sows

This study was conducted to estimate the growth curve parameters of crossbreds between Korean native boars and Landrace sows and their relationships with meat qualities. The data used were weight-age data and carcass data from 131 males and 122 females raised at N.L.R.I in Korea. Growth curve parameters were estimated from nonlinear regression using Gompertz model individually. Average mature weight(A), average maturing rate(k), and average inflection point( tI ) showing maximum growth rate estimated were 179.54 ± 6.06kg, 0.3154 ± 0.0059, and 5.50 ± 0.11 months in females, and 179.84 ± 6.33kg, 0.3049 ± 0.0061, and 5.24 ± 0.13 months in males, respectively. For the growth curve parameters and derived statistics, the phenotypic correlations of maturing rate with gain rate at inflection, mature weight, and inflection point were .30, .77, and .93 in male, and .31, .78 and .94 in female, respectively. Matrure weight was positively correlated to the inflection point as + .89 in both male and female, indicating that late maturing pigs with lower k had longer maturing period with increasing gain rate and reached point of inflection later than early maturing pigs with higher k, and grew to larger mature weight. Backfat thickness and crude fat contents were correlated with mature weight positively in male and negatively in female, and correlated with gain rate at inflection point positively in both male and female, of which coefficients were as high as .42 and .50 in male, respectively.

Comparison of Growth Performance between Korean Native Layer Chickens and Imported Layer Chickens at Early Rearing Stage

Department of Animal Science, Chonnam National UniversityABSTRACT The objective of this study was to compare the growth performance between Korean native layer chickens and imported layer chickens at early rearing stage. Total number of chicks analyzed in this study was 276 and feeding period was conducted from July 24, 2012 for 10 weeks. Five strains including 2 Korean native strains: A=Korean Native Black (Chung-cheongbuk-do) and B=Korean Native Yellowish Brown (Gyeongsangbuk-do) and 3 imported layer strains: C=White Leghorn (Gyeongsangnam-do), D=White Leghorn (Seoul), and E=Ameraucanas (Gyeongsangbuk-do) were used to analyze the following traits such as fertility, hatchability, body weight at a different growing stage, average body weight gain, and feed conversion ratio. The fertilities and hatchabilities of strains were 93.88% and 95.65% in strain A, 81.75% and 86.24% in strain B, 82.25% and 88.15% in strain C, 79.25% and 90.85% in strain D, and 71.50% and 88.11% in strain E, respectively. A viability was excellent in strains A and E to be more than 98% and was low in strain D to be 86.67% at a whole week. The strain A had greater body weight during growing stages (p<0.05) than the other strains. The shank length of strain D of 56.69±3.27 mm was the highest value at 10 weeks of age among strains (p<0.05). The phenotypic correlation coefficients of strains A and D between an average body weight gain and a shank length were 0.63 and 0.73 during 02 wk, 0.70 and 0.55 during 24 wk, 0.55 and 0.54 during 46 wk, 0.50 and 0.24 during 68 wk, and 0.46 and 0.29 during 810 wk, respectively. The Korean native hens may have potential abilities to be used as an excellent seed stock for poultry industry.(Key words : Korean native chickens, imported layer chickens, early rearing stage, body weight, shank length)

A study of Association of the H-FABP RFLP with Economic Traits of Pigs

The purpose of this study was to detect association between genetic variation and economic trait in the porcine heart type fatty acid-binding protein gene as a candidate gene for the traits related with growth and meat quality in pigs. The H-FABP is a 15-kDa protein expressed in several tissues with high demand for fat metabolism such as cardiac and skeletal muscle and lactating mammary gland. H-FABP is small intracellular protein involved in fatty acid transport from the plasma membrane to the site of -oxidation and/or triacylglycerol or phospholipid synthesis. In this study, H-FABP PCR-RFLP was performed in F population composed of 214 individuals from an intercross between Korean Native Boars and Landrace sows. PCR products from two primer sets within H-FABP gene were amplified in 850bp and 700bp. Digestion of PCR products with the restriction digestion enzymes HaeⅢ and HinfⅠ, revealed fragment length polymorphisms(RFLPs). The genotype frequencies from H-FABP/HaeⅢ was .29 for genotype DD, .53 for genotype Dd, and .15 for genotype dd, respectively. The genotype frequencies of HH, Hh, and hh from H-FABP/HinfⅠ was .38, .41 and .20, respectively, in the population. Relationships between their genotypes and economic traits were estimated. In H-FABP/HaeⅢ locus, there were specific genotypes(Dd and dd) associated with economic traits such as body weights at 3, 5, 12, and 30 week of age (p〈.05 to .001). The ‘d’ allele was associated with gaining of body weight. In H-FABP/HinfⅠ locus, Genotypes of HH and Hh associated with growth traits such as body weights at 5, 12, and 30 week of age (p〈.05 or p〈.001) and back fat thickness, body fat including abdominal and trimmed fat (p〈.001) and intramuscular fat(p〈.05) The ‘H’ allele was positively associated with gaining of body weight and fatness deposition. In conclusion, a significant association of the H-FABP gene from its genetic variation was found on body weight, intramuscular fat and backfat thickness.

Parameter Estimates for Genetic Effects on Growth Traits of Korean Native Goats

Data were collected from 1996 through 2000 on Korean Native Goats by the National Livestock Research Institute of Korea were used to estimate genetic parameters for birth, 3 month, and 6 month body weights. Estimates were obtained with MTDFREML. Model included animal and maternal genetic and residual effects. The model included sex, birth year-season, and feeding type as fixed factors. Average body weights and standard deviation were 1.780.32 at birth of age, 7.992.66 at 3 month of age, and 12.083.20 kg at 6 month of age, respectively. Average body measurements were 36.46cm for withers height, 38.06cm for body length, and 45.56cm for heart girth at 3 month of age, and were 40.27cm for withers height, 42.01cm for body length, and 51.07cm for heart girth at 6 month of age, respectively. Estimates of heritability were 0.66 for birth weight, 0.34 for 3 month body weight, and 0.27 for 6 month body weight, respectively. Maternal effects would be important for birth and 3 month body weights and may not be needed in a model for 6 month body weight.

Genomic Polymorphism Analysis using Microsatellite MarkersGenomic Polymorphism Analysis using Microsatellite Markers in Gyeongju Donggyeong Dogs

This study was conducted to find a useful marker for gene polymorphism analysis using Microsatellite marker (MS marker) in Gyeongju Donggyeong dog. Twenty three MS marker analyzed the genetic features of DNA using 100 Gyeongju Donggyeong dogs in Gyeongju area. It was performed multiplex PCR with 3 set primer divided 9, 10 and 4 by analysis of conditions among MS markers. The results were calculated heterozygosity, polymorphic information content (PIC), allele frequency and number of allele at each locus using Microsatellite Toolkit software and Cervus 3.0 program. Total 148 alleles were genotyped to determine and average 6.43 alleles was detected. FH3381 had the highest of 15 alleles and FH2834 had the lowest of 2 alleles. Expected heterozygosity had a wide range from 0.282 to 0.876 and had average value of 0.6496. Also, Observed heterozygosity had a more wide range from 0.200 to 0.950 and had average value of 0.6404. PIC had range from 0.262 to 0.859 and average PIC was calculated 0.606. Especially, FH2998 represented the highest rate of observed heterozygosity of 0.950 and FH3381 represented the highest rate of expected heterozygosity of 0.876 and PIC of 0.859. The use of these markers was considered to be useful to study genetic traits of Gyeongju Donggyeong dog. (

Association of Single Nucleotide Polymorphism (SNP) in the PGK 2 Gene with Growth Traits in Pigs

The purpose of this study was to analyse of association between growth traits and single nucleotide polymorphisms (SNPs) polymorphism of phosphoglycerate kinase 2 (PGK 2) gene in pigs. The birth weight of piglet influences on weaning weight and survival rate that are import economic traits in pig industry. Also, these growth traits are representative factor to decrease a period getting to marketing weight as well as growth rate in pig. The PGK 2 is an isozyme that catalyzes the first ATP-generating step in the glycolytic pathwayand important enzyme related with energy metabolism. Twenty of SNPs were discoveredby genome structure analysis that compares the sequence on promoter and transcription region of PGK 2 gene in porcine chromosome 7. An association between PGK 2 SNPs and growth traits was analyzed in F2 reciprocal-crossbred population between korean native pig (KNP) and Landrace. Association analysis indicated that polymorphism of the PGK 2 gene promoter region has significant effects on weight at birth (p<0.01) and weight at 3 weeks of age (p<0.0001). These results suggest that PGK 2 gene polymorphism was associated with energy metabolism and physiological function of growth in pig. (Key words : PGK 2, SNP, Pig, Birth weight, 3 weeks weight)

Study of Jindo Dog Personality Traits:Questionnaire of The 16th Korean Jindo Dog Show

ABSTRACT There have been studies about dog’s personality and behavior, which is helpful to breed dogs as guide or companion. In this study, a questionnaire was developed using 54 Jindo dogs, which considered ten items about aggressiveness and sociability. The scores were analyzed by principle component analysis (PCA), after accounting for four variables: age, gender, growing place, and coat-colors. Our results from the PCA indicated three principle components, which classified ‘aggressiveness’, ‘sociability’ and unknown factor. The four variables did not significantly affect aggressiveness (P>0.05). However, there was a relationship between coat-color and sociability, i.e., the Jindo dogs with fawn color were more sociable than the white ones (P<0.1). ( Key words : Jindo dog, Personality, Coat-color, Aggressiveness, Sociability) . 서 론 개( Canis lufus familiaris )는 인간과 가장 가까이 지내는 동물이며, 인간에 의해서 다양한 외형적인 표현형을 가지는 종으로 개발되어 왔다 (Sutter와 Ostrander, 2004). 그러나 최근에는 개의 외형적인 표현형뿐만 아니라 그들이 가지는 행동이나 성격형질들이 과학자들의 관심을 받고 있다(Svartberg와 Forkman, 2002). 개의 성격에 대한 과학적인 연구를 위해 다양한 조사 방법들이 시도되고 있는데, 그 중에서 전문적인 사육사나 일반 애견가들에게 그들이 기르는 개

Body Condition Score of Hanwoo Cows and Reproductive Performances Performances

Data from five Hanwoo breeding farms were collected to analyze the effects of parity, season, nutrition and reproduction on body conditions of heifers and cows and to analyze the relationships of body conditions with reproductive performances and body growth. Analytic models included farms and parity which were run through SAS to estimate least squares means and correlation coeflicients between traits body condition scores(BCS) of I(very emaciated) through 9(very obese) scale at service and at calving. calving interval, days to rebreeding, gestation length. number of services per conception. Overall averages were 4.55 for BCS at service, 5.42 for BCS at calving. 406.7days of calving interval, 287.7days of gestation length, 66.2days from calving 10 first service and 1.78 times of services per conception. Number of services per conception was 1.501.74 times for the cows of BCS 5 or under and 2.003.00 for those of BCS 6 or higher. Body weight of calves from cows observed averaged 23.3kg at birth and 70.7kg at weaning. 57 percent of cows showed BCS 45 at service while 46 percent of those showed 56 at calving. Estimated phenotypic correlation coefficients of BCS at service with BCS at calving, calving interval, gestation length, number of services per conception were low but positive: 0.16, 0.26. 0.08 and 0.06. respectively. Phenotypic correlations of BCS at calving with calving interval, gestation length and number of services per conception were estimated to be also low and positive: 0.10, 0.13 and 0.10. respectively. However, phenotypic correlations between calving interval and gestation length, and between gestation length and number of services per conception were negative but low as - 0.11 and- 0.13 each.

Characteristics of Individual Growth Curve by Porcine LEPR-derived Microsatellite Polymorphisms

ABSTRACT This study was conducted to estimate the growth curve parameters of 253 heads of F2 population producedby inter-crossing F1 from Korean Native boars and Landrace sows, and to estimate the effects of Leptinreceptor gene( LEPR ) on their growth characteristics. Growth curve parameters were estimated from nonlinearregression using Gompertz model individually.Average mature weight and average maturing rate estimated were 179.69±4.40kg and 0.3103±0.0043,respectively. The effect of sex was insignificant for all the parameters estimated from Gempertz model(p .05),and the effect of calving group was significant for mature weight and maximum growth rate at inflection point(p .05). The effect of LEPR genotype were significant for all the growth curve parameters(p .05). Accordingfrom the results of the least squares means of growth curve parameters by LEPR genotypes, mature weightand point of inflection were highest in genotype AA in which the maturing rate was the lowest, and werelowest in genotype DD in which maturing rate was the highest, reversely.(