본 연구는 젖소 종모우 973두의 국내 추정 육종가, 국제유전능력평가에 의한 육종가 그리고 MACE proof를 이용한 DRP를 비교하여 종모우 선발의 정확도 향상을 위한 방안을 제시하기 위하여 수행하였다. Interbull의 국제유전능력평가는 유량 형질 기준으로 32개국 31개 집단과 총 134,533두의 종모우가 참여하는 것으로 조사되었다. 국내 추정 육종가와 interbull 추정 육종가 상관계수는 0.925로 나타났으며, 육종가에 대한 산지별 상관은 캐나다, 미국 및 국산에서 각각 0.917, 0.910과 0.996으로 나타났다. 충분한 딸소 수를 보유하여 신뢰도가 높은 경우에는 국내산이나 수입산 모든 종모우에서 신뢰도의 변화량이 크지 않으나, 국내에서는 EDC가 낮지만 해외 자료에서 EDC가 높은 경우 43까지 신뢰도가 증가하였다. 973두 종모우들의 경우 신뢰도의 평균은 87.16±10.62이며, 51~99의 범위를 나타내었으며, deregressed MACE proof와 MACE proof의 상관계수는 0.945로 높게 나타났다.

The objective of this study was to estimate genetic parameters on days to 90 kg body weight and ultrasound measured traits (back fat thickness, eye muscle area, retail cut percentage) and predict genetic progress when the weights for selection on the paternal traits of Duroc, which can be incorporated into sire line selection indexes. A simulation program, ZPLAN+, was used for the simulation. Genetic parameters of days to 90 kg body weight (D90KG), back fat thickness (BFT), eye muscle area (EMA) and retail cut percentage (RCP) used in the simulation were estimated from 27,972 heads of farm tested Duroc pigs from 2005 to July, 2012. Parameters of simulation used genetic parameters with parturition rates, ratios of test pigs and replacement rates that were dependent on selection protocols of simulated farms. Different weights of selection for traits of days to 90 kg and backfat thickness were compared. Estimates of heritability were 0.406, 0.355, 0.159 and 0.379 for D90KG, BFT, EMA and RCP, respectively. Genetic correlation of D90KG with BFT, EMA and RCP were –0.043, 0.049 and 0.021, respectively. Genetic correlation of BFT with EMA and RCP were –0.394 and –0.937. And genetic correlation between EMA with RCP were 0.524. Simulation result showed that index weight of 3:1 on D90KG and BFT was effective to shorten days to 90 kg without any significant changes in backfat thickness. Generally the genetic changes were greater as parturition rate and ratios of test pigs increased. Increase in replacement rate had a small effect on genetic changes in negative way. Thus, we recommend that index weight of 3:1 on days to 90 kg and backfat thickness could be utilized for sire line selection.

The relationships of scrotal circumference (SC) to semen characteristics and the conception rate (70 days-nonreturn rate) of artificial insemination in farm were studied with 137 heads of bull in Hanwoo. The average and range of SC were cm and 26.0~52.5 cm, respectively. Hanwoo bulls were classified with SC, divided into 34 cm below group, 34~39 cm group, and 39 cm over group. The 5,487 semen records of 43 heads of bull from July. 1. 2007 to June. 30. 2008. were used to determine the relationships between SC and semen characteristics. The semen concentration and total sperm number of each group were 11.18, 16.68, and , and 69.83, 101.64 and /ejaculate. The bulls with 34 cm or more SC were higher than the bulls with 34 cm below in semen concentration and total sperm number (p<0.01). But between SC and semen volume have no significant relationship (p>0.05). The 9,862 mating records of 44 farm with 137 heads of bull were used to determine the relationships between SC and conception rate. The conception rate of 1st artificial insemination were 73.31, 74.16, and 77.33 % in each group. Also SC was positively correlated with pregnancy rate (r=0.12, p=0.17). These results indicate that SC correlates positively with semen characteristics, and maybe with pregnancy rate in Hanwoo.

한우 종모우의 고환둘레와 정액성상 그리고 후대희 성장 및 도체성적과의 관계를 구명하기 위하여 4~8세 한우 종무우 92두를 공시하였으며 8,628개의 종모우 정액성상 그리고 종모우 후대 814e의 성장 및 도체성적을 이용하였다. 종모우의 고환둘레는 38.73.73 cm, 1차 정액량, 정자농도 및 총정자수는 각각 5.63mL, 17.9/mL 및 100.34/ejaculation 이었고 2차 정액량, 정자농도, 및 총정자수는 각각 5.32mL, 15.0/