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이광전(K . J . Lee),강석형(S . H . Kang),강민식(M . S . Kang),조주현(J . H . Cho) 한국축산학회 1995 한국축산학회지 Vol.37 No.5
Four thousand eighty reproduction records(3,063 cow records and 1,017 heifer records) of Holsteins bom between 1984 and 1993 collected by National Livestock Research Institute, Kyeonggi Animal Breeding Station and Kangwon Animal Breeding Station were analyzed to estimate genetic parameters for reproduction traits(days open, gestation length, calving interval, months to lint service and months to first pregnancy). Means of each reproduction trait showed that days open, gestation length were 133.3, 280.4days, and calving interval, months to first service and months to first pregnancy were 13.4, 16.2, and 17.1 months respectively. Heritabilities for days open, gestation length and calving interval were 0.0232, 0.1414 and 0.0194 respectively and repeatabilities for those were 0.0430, 0.1414 and 0.052.5 respectively. Heritabilities for months to first service and first pregnancy in heifer were 0.1514 and 0.0738 respectively. Phenotypic and genetic correlation of 0.9673 and 0.9319 for days open and calving interval were highest, while those for months to first service and first pregnancy in heifer were 0.7169 and 0.6559. The remarkable genetic trends for reproduction traits were not shown.
가계분석에 의한 k- casein 과 β- lactoglobulin 의 유전자형 분리에 관한 연구
이광전(K . J . Lee),김정언(J . U . Kim),이연근(Y . K . Lee),강민식(M . S . Kang),강석형(S . H . Kang) 한국축산학회 1995 한국축산학회지 Vol.37 No.3
This study was performed to offer basic data of both reducing generation interval and improving selection accuracy of dairy cattle for application of parentage test according to analyzing loci of κ-casein and β-lactoglobulin in related Korean dairy cattle using the PCR. The blood samples used in this study were taken from 24 related dairy cattle in Sin-Jung dairy farm and the frozen semen of two straws used in this study were taken from commercial firms. The results obtained were as follows; 1. This study established the extracting method of high quality DNA from the blood samples of 24 related dairy cattle and from two frozen semen samples by using phenol and determined the analyzing method for the polymorphism of κ-casein and β-lactoglobulin using PCR. 2. According to the restricted enzyme digestion in amplified products of κ-casein and β-lactoglobulin using PCR, κ-casein showed AA and AB types, and β-lactoglobulin showed AA, AB, and BB types, respectively. 3. By restricting enzyme digestion, genotypes of κ-caaein and β-lactoglobulin for dairy cows were always derived from genotypes of one parent or both parents. 4. Genetic panems between κ-casein and β-lactoglobulin markers showed independent gene segregations, therefore, in case of being known sire genotypes, genotypes of daughters would be detemuned by probability. 5. For ttte genetic improvement of dairy cattle, if the semen of sire with κ-casein BB or β-lactoglobulin BB were used by the A.I, genotyping method of marker genes can be useful for early identification and selection of dairy calves.