Abstract
Repeatabilities and Correlations among Average Daily Gain, Backfat Thickness and Lean Percent in Swine The repeatability, correlation and rank correlation coefficients among average daily gain, backfat thickness and lean percent were estimated on the basis of records tested from August 1999 to February 2000 with 695 pigs of Duroc, Landrace and Yorkshire boars and gilts tested at 2nd Korea Swine Test Station located in Ha-dong, Kyeongnam Province. The effect of the sex, breed and month of measured were estimated by the least square method. The repeatabilities were estimated from the component of variance among repeated measurements of the trait for the same animal. The results obtained are summarized as follow ; 1. The means of the major economic traits studied were 142.1 days, 173.7 days and 182.5 days for age at 1st, 2nd and 3rd measure, 57.9%, 56.2% and 55.2% for lean percent at 1st, 2nd and 3rd measure, 1.33cm, 1.61cm and 1.63cm for backfat thickness at 1st, 2nd and 3rd measure, 946.6g, 879.2g and 879.4g for average daily gain at 1st, 2nd and 3rd measure, respectively. 2. The correlation coefficients between the backfat thicknesses measured at 1st and 2nd, at 2nd and 3rd, at 1st and 3rd were 0.424, 0.700 and 1.424, respectively. The correlation coefficients between the lean percent measured at 1st and 2nd, at 2nd and 3rd, at 1st and 3rd were 0.493, 0.619 and 0.471, respectively. The correlation coefficients between the average daily gain measured at 1st and 2nd, at 2nd and 3rd, at 1st and 3rd were 0.716, 0.861 and 0.601, respectively. 3. The rank correlation coefficients between backfat thickness measured at 1st and 2nd, at 2nd and 3rd, at 1st and 3rd were 0.438, 0.693 and 0.441, respectively. The rank correlation coefficients between lean percent measured at 1st and 2nd, at 2nd and 3rd, at 1st and 3rd were 0.508, 0.593 and 0.478, respectively. The rank correlation coefficients between average daily gain measured at 1st and 2nd, at 2nd and 3rd, at 1st and 3rd were 0.704, 0.834 and 0.571, respectively. 4. The estimated repeatabilities of the traits studied were 0.428 for the lean percent, 0.374 for the backfat thickness and 0.673 for the average daily gain, respectively.
본 연구는 1999년 8월부터 2000년 2월까지 공인 제2종돈능력검정소에서 검정 종료된 Duroc종, Landrace종 및 Yorkshire종에 대하여 체중, 등지방두께, 일당증체량 및 정육율을 측정하여, 동일 개체의 반복측정치 간의 반복력과, 상관 및 순위상관을 추정하였으며, 그 결과를 요약하면 다음과 같다. 1. 평균능력은 측정시 체중이 각각 91.0, 114.7, 123.2kg이였으며, 측정시 일령은 각각 142.1, 173.7, 182.5일이였으며, 정육율은 각각 57.9, 56.2, 55.2%였으며, 등지방두께는 각각 1.33, 1.61, 1.63cm였으며, 일당증체량은 각각 946.6, 879.2, 879.4g으로 나타났다. 2. 각 형질의 측정차수간 상관은 정육율의 경우, 1차와 2차, 1차와 3차, 2차와 3차간 각각 0.493, 0.471, 0.619로 나타났고, 등지방두께의 경우, 각각 0.424, 0.424, 0.700으로 나타났으며, 일당증체량의 경우, 각각 0.716, 0.601, 0.861로 모든 형질에서 1차와 2차간, 1차와 3차간 보다는 2차와 3차간에 높게 추정되었다. 3. 각 측정차수의 형질간 상관은 1차 측정의 경우, 정육율과 등지방두께, 정육율과 일당증체량, 등지방두께와 일당증체량이 각각 －0.597, －0.291, 0.303으로 나타났고, 2차 측정의 경우, 각각 －0.667, －0.292, 0.396으로 나타났으며, 3차 측정의 경우, 각각 －0.711, －0.369, 0.409로 정육율과 등지방두께 및 일당증체량은 부의 상관관계에 있으며, 등지방두께와 일당증체량은 정의 상관관계에 있고, 일령이 증가할수록 상관이 높게 추정되었다. 4. 각 형질의 반복력 추정치를 살펴보면, 등지방두께가 0.374, 정육율이 0.428, 일당증체량이 0.673으로 추정되었으며, 일당증체량의 반복력은 상당히 높게 추정되어, 110kg까지 검정의 필요성이 인정되지 않으나, 등지방두께와 정육율의 추정치는 낮게 추정되어 더욱 많은 연구가 필요할 것으로 사료된다.
