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 1.50${\sim}$1.74 times for the cows of BCS 5 or under and 2.00${\sim}$3.00 for those of BCS 6 or higher. Body weight of calves from cows observed averaged 23.3kg at birth and 70.7kg at weaning. 57 percent of cows showed BCS 4${\sim}$5 at service while 46 percent of those showed 5${\sim}$6 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.

韓牛 牝牛의 Body Condition Score가 繁殖形質에 미치는 影響

본 연구는 산차, 계절, 영양상태, 번식주기에 따라 변화하는 한우 빈우의 몸 상태(Body Condition)를 주기적으로 등급화 하여 조사한 값과 동일한 시기에 조사된 한우 번식우의 발육 및 번식형질과의 상관관계를 추정하고, 한우 빈우에서 측정된 몽상태 점수(Body Condition Score, BCS)를 번식 및 사양관리의 수단으로 적용할 수 있는 범위의 기초자료로 제공하고자 실시하였다. 각 형질별 최소자승평균을 추정하였는 바, 분만간격은 406.7일, 임신기간은 287.7일, 분만후 첫종부 일수는 66.2일, 수태당 종부횟수는 1.78회였다. 송아지 생시체중은 23.3kg, 이유시 체중은 70.7kg 이었다. 종부시 BCS와 분만시 BCS의 평균은 4.55, 5.29 이었으며, 수태당 종부횟수를 BCS 점수에 따라 추정한 바, 종부시 BCS가 5 이하에서는 1.50${\sim}$1.74회였으나, 6 이상에서는 2.00${\sim}$3.00회 로 나타났다. 종부시와 분만시 BCS의 분포는 종부시에는 BCS 4${\sim}$5에 서 57%를, 분만시 BCS 5${\sim}$6에 서 46%로 나타내었다. 주요 번식형질의 표현형 상관은 종부시 BCS와 분만시 BCS, 분만간격, 임신기간, 수태당 종부횟수 사이에는 0.16, 0.26, 0.08, 0.06으로 정의 상관을 보였고, 분만시 BCS와 분만간격, 임신기간, 수태당 종부횟수 사이에는 0.10, 0.13, 0.10으로 역시 정의 상관관계를 보였으나, 분만간격과 임신기간, 임신기간과 수태당 종부횟수간에는 -0.11, - 0.13으로 부의 상관을 보였다.