한우에서 분만난이도에 대한 유전모수 추정
Genetic Parameters of Direct and Maternal Effects for Calving Ease in Hanwoo
2
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
본 연구는 분만난이도 형질에 대한 유전모수를 추정하기 위하여 2018년부터 2020년까지 조사된 2,102건의 분만난이도 자료를 이용하였다. 한우에서 분만난이도 점수는 범주형 데이터로써 1~4점(1=순산, 2=약간 도움, 3=많은 도움, 4=기계사용 혹은 절개수술)으로 조사되었으며, 선형모형 분석을 위해 절단형 정규분포를 이용하여 자료변환을 실시하였다. 유전모수 추정을 위해 고정효과로 분만년도-계절, 송아지 성별, 어미의 산차, 어미의 분만시 연령이 고려되었으며, 개체의 유전효과(직접효과와 모체효과) 및 잔차효과는 임의효과로 모델에 적용하였고, BLUPF90프로그램을 이용하여 유전모수를 추정하였다. 분만난이도 점수는 송아지의 성별이 수컷이고, 초산차이고, 최근 분만한 암소들이 송아지의 성별이 암컷이고, 산차가 높고, 과거에 분만한 암소들에 비해 높게 나타났다. 한우에서 분만난이도에 대한 유전모수를 추정한 결과 직접유전분산(0.0164)은 모체유전분산(0.0018)에 비해 높게 나타났으며, 직접 및 모체효과에 대한 유전력은 각각 0.055와 0.006으로 추정되었다. 본 연구에서 추정된 유전모수값은 한우의 분만난이도 형질에 대한 유전능력평가에 활용될 수 있을 것으로 판단된다.
Abstract
This study evaluated genetic parameters of direct and maternal effects for calving ease in Hanwoo. A total of 2,102 records for calving ease were collected from 2018 to 2020 from the Hanwoo Genetic Improvement Center in Korea. The calving ease score was rated from 1 to 4 (1=unassisted delivery, 2=assisted easy calving, 3=assisted difficult calving, 4=mechanical or caesarean section) as categorical data, and the data were converted using a truncated normal distribution for linear model analysis. To evaluate the genetic parameters, the birth year-season of calving, the sex of the calf, parity, and the age of the dam at calving were considered as fixed effects, and genetic and maternal effects were considered random effects. The genetic parameters were evaluated using the program BLUPF90. The calving ease scores for male calves, first parity cows, and currently calving cows were much higher than for females, later parities, and past calving cows. The direct genetic variance (0.0164) was higher than the maternal genetic variance (0.0018), and the estimated heritabilities of the direct and maternal effects were 0.055 and 0.006, respectively. The parameters determined here should help with the genetic evaluation of calving ease in Hanwoo.
참고문헌 (17)
- Mahboob Alam, "Genetic parameters of calving ease using sire-maternal grandsire model in Korean Holsteins", Animal Bioscience, 30(9), pp.1225~1233 (2017), 아세아·태평양축산학회[DOI]
- Carnier, P., "Genetic parameters for direct and maternal calving ability over parities in Piedmontese cattle", J. Anim. Sci, 78, pp.2532~2539 (2000)
- Eaglen, S. A. E., "Genetic parameters of direct and maternal effects for calving ease in Dutch Holstein-Friesian cattle", J. Dairy Sci, 92, pp.2229~2237 (2009)
- Eaglen, S. A. E., "Evaluating alternate models to estimate genetic parameters of calving traits in United Kingdom Holstein-Friesian dairy cattle", Genet Select Evol, 44, pp.23~ (2012)
- Eaglen, S. A. E., "Direct and maternal genetic relationships between calving ease, gestation length, milk production, fertility, type, and lifespan of Holstein-Friesian primiparous cows", J. Dairy Sci, 96, pp.4015~4025 (2013)
- Foulley, J. L., "A completion simulator for the two-sided truncated normal distribution", Genet. Sel. Evol, 32, pp.631~635 (2000)
- Gutiérrez, J. P., "Genetic relationships among calving ease, calving interval, birth weight, and weaning weight in the Asturiana de los Valles beef cattle breed", J. Anim. Sci, 85, pp.69~75 (2007)
- Hickey, J. M., "Heterogeneity of genetic parameters for calving difficulty in Holstein heifers in Ireland", J. Dairy Sci, 90, pp.3900~3908 (2007)
- Luo, M. F., "Estimation of genetic parameters of calving ease in first and second parities of Canadian Holsteins using Bayesian methods", Livest. Prod. Sci, 74, pp.175~184 (2002)
- Meijering, A., "Dystocia and stillbirth in cattle. A review of causes, relations and implications", Livest. Prod. Sci, 11, pp.143~177 (1984)
- "Manual for BLUPF90 family programs" (2018)[URL]
- Mujibi, F. D. N., "Genetic parameters for calving ease, gestation length, and birth weight in Charolais cattle", J. Anim. Sci, 87, pp.2759~2766 (2009)
- Silvestre, A., "Genetic parameters of calving ease in dairy cattle using threshold and linear models, Italian J", Anim. Sci, 18(1), pp.80~87 (2019)
- Steinbock, L., "Genetic effects on stillbirth and calving difficulty in Swedish Holsteins at first and second calving", J. Dairy. Sci, 86, pp.2228~2235 (2003)
- Vanderick, S., "Genetic parameters for direct and maternal calving ease in Walloon dairy cattle based on linear and threshold models", J. Anim. Breed. Genet, 131, pp.513~521 (2014)
- Wang, Y., "Comparison of models and impact of missing records on genetic evaluation of calving ease in a simulated beef cattle population", Can. J. Anim. Sci, 85, pp.145~155 (2005)
- Wiggans, G. R., "Calving Ease(Co)Variance Components for a Sire-Maternal Grandsire Threshold Model", J. Dairy Sci, 86, pp.1845~1848 (2003)