Studies on the Carcass Rates, Natrient Contents and Optimum Prices of Broilers and Old Layers as Related to Body Weight

육계의 종류 및 체중별 도체율과 영양성분 및 적정가격에 관한 조사연구

This study was conducted to determine the carcass rates, partcarcass production percentages, nutrient contents and optimum prices of broilers and old layers as related to the body weight. Total 240 birds were used and results obtained are summarized as follows. 1.The carcass rates were 61.41% in young chickens (0.6-0.8kg), 65.07% in semi-bros(1.2-1.4kg) and 66.39% in high- bros (1.7-2.1kg), showing a trend of increased carcass rate as the body weight increased. The carcass rates of old layers were lower than those of broilers, being 62.68% in white old lavers (1.8-2.0kg) and 63.07% in colored old layers (2.1- 2.4 kg) 2. Although there was little difference in part-carcass production percentages between breeds or body weights of broilers, most of the part-carcass was produced from legs, breast, back, wings and neck in order. 3. As the body weight increased, the moisture content of deboned carcass of broilers decreased (71.27% in young chickens, 62.66% in semi-bros and 60.39% in high-bros), while the fat content increased (11.47% in young chickens, 17.60% in semi-bros and 19.87% in high-bros). The protein content of semi-bros (17.21%) was higher than that of young chickens (14.75%) or high-bros (16.93%), but no difference was noted in old layers whether they were white or colored. 4. When compared on the basis of protein or Protein plus fat content in grams per kilogram body weight, the market price of semi-bros per kilogram body weight was more expensive and that of old layers was cheaper than that of high- bros.

본 조사연구는 육계의 종류 및 체중별 도체율, 부분육비율, 영양소 함량 및 적정가격을 검토하기 위하여 육계의 종류별 및 체중별로 총 240수를 공시하여 조사한 결과는 다음과 같다. 1. 도체율은 브로일러 및 노계에서 모두 체중이 무거울수록 높아지는 경향을 보여, 브로일러에서 영계(0.6-0.8kg)는 61.41%, 세미브로(1.2-1.4kg)는 65.07%, 하이브로 (1.7-2.1kg)는 66.39%였고, 노계에서 백색노계(1.8-2.0kg)는 62.68%, 유색노계(2.1-2.4kg)는 63.07% 였으며, 노계는 브로일러보다 도체율이 낮았다. 2. 부분육의 생산비율은 육계의 종류 및 체중에 따라 큰 차이를 보이지 않았으며, 비율이 높은 순서는 다리, 가슴, 등, 날개, 목의 순서였다. 3. 발골한 도체의 성분에서 브로일러는 체중이 무거워질수록 수분함량(%)이 감소(영계 71.27%, 세미브로 62.66%, 하이브로 60.39%)한 반면 지방함량은 증가(영계 11.47%, 세미브로 17.60%, 하이브로 19.87%)하였으나 단백질 함량은 세미브로(17.21%)가 영계(14.75%)나 하이브로(16.93%)보다 높았고, 노계는 백색과 유색노계간에 큰 차이가 없었다. 4. 육계의 생체kg당 가격에서 시중유통가격은 육계의 단백질함량기준 적정가나 단백질＋지방함량 기준적정가와 비교하여 하이브로에 비해 세미브로는 높게 그리고 낮게 유통되고 있었다.