우리나라 Holstein 능력검정 젖소 집단의 혈통구조 및 근교계수 분석
Analysis of Pedigree Structure and Inbreeding Coefficient for Performance Tested Holstein Cows in Korea
The study was aimed to analyze pedigree structure and inbreeding coefficients forperformance tested Holstein cows in Korea. A total of 400,029 Holstein cows data which bornbetween 2002 and 2012 were obtained from Dairy Cattle Improvement Center of NationalAgricultural Cooperative Federation(NACF). Their related pedigrees, as obtained from KoreanAnimal Improvement Association(KAIA), consisted of 509,740 animals. Pedigree depth of thecows were traced back to 3 generations earlier. The percentage of cows with fully identifiedancestors in various provinces of Korea were 55.18%(Gyeonggi-do), 23.49%(Gangwon-do),47.83%(Chungcheongnam-do), 53.62%(Chungcheongbuk-do), 56.38%(Gyeongsangbuk-do), 51.35%(Gyeongsangnam-do), 26.58%(Jeollanam-do), 49.41%(Jeollabuk-do), and 56.90%(Jeju-do), whereas,it was about 63.20% as a whole in Korea. The average inbreeding coefficients showed increment across the consecutive years of birth such as, 0.43(2002), 0.44(2003), 0.58(2004),0.64(2005), 0.78(2006), 0.93(2007), 1.08(2008), 1.23(2009), 1.46(2010), 1.77(2011), and 2.03(2012). However, this coefficient was 0.93 in overall Korean population. An average generationinterval for sire to daughter genetic path was 8.15 years; which was about 4.20 yearsconsidering dam to daughter genetic path. The estimated effective population sizes (? ) were56.5, 51.3, and 32.2 animals born in 2004, 2009, and 2012, respectively. These results indicatedthat an increased rate of inbreeding has led to a significant reduction in the ? over thedecade.
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