本 硏究는 肉用鷄에 있어서 溫度變化에 따른 季節 및 암수 分離飼育에 따르는 性別 飼育方法이 生存率, 體重, 飼料攝取量 및 飼料要求率 等에 미치는 效果를 究明하기 위하여 ’86~’89年度의 4年間의 肉用鷄 經濟能力檢定成績을 3季節(봄, 여름, 겨울)과 性別(수탉, 암탉)로 分類하여 鷄群當 240~360首씩 12回에 걸쳐 118鷄群 38,451 首를 6, 7週間 調査 記錄한 成績으로 分析하였던 바 그 結果를 要約하면 다음과 같다.
1. 生存率은 암탉이 수탉에 비해 6, 7週齡에 0.4~0.6% 더 높았으며(P<0.01), 季節과 性別間에도 모든 季節에서 암탉의 生存率이 높았다.
2. 體重은 수탉이 암탉보다 6週齡에 17.4%, 7週齡에는 19.1%가 무거웠으며(P<0.01), 季節과 性別로도 수탉이 암탉보다 봄 18.0~19.6%, 여름 17.6~18.4% 그리고 겨울에는 19.6~19.3% 더 무거운 것으로 나타났다.
3. 飼料攝取量은 수탉이 암탉에 비해 약 13.3~13.8%를 더 攝取하였으며(P<0.01), 季節과 性別로도 같은 傾向이었는데 수탉이 암탉보다 飼料를 봄 11.7~13.5%, 여름 17.3~15.0% 그리고 겨울에는 11.5~13.0% 더 섭취한 것으로 나타났다.
4. 飼料要求率도 수탉이 암탉보다 4.3~4.6%가 더 많았고(P<0.01), 季節과 性別에서도 같은 傾向으로 수탉의 飼料要求率이 봄 6~7.1%, 여름 5.9~1% 그리고 겨울에는 5.4~5.5%로 모든 季節에서 높았다.
5. 季節別로 암수 分離飼育한 肉鷄의 産肉形質에 대한 相關係數에서 봄에는 體重과 飼料攝取量間에 수탉은 0.81~0.87, 암탉은 0.84~0.88, 체중과 飼料要求率간에는 수탉이 -0.32~-0.51, 암탉은 -0.17~-0.45로 나타나 수탉의 飼料利用效率이 암탉보다 높은 關係를 나타내고 있다.
6. 여름에는 生存率과 體重間의 相關係數는 수탉이 -0.1~-0.37, 암탉은 -0.36~-0.51, 體重과 飼料攝取量은 수탉에서는 0.66~0.77, 암탉은 0.5~0.82, 體重과 飼料要求率은 수탉이 -0.42~-0.22, 암탉은 -0.24~0.001로 나타났다.
7. 겨울의 相關係數에서는 生存率과 體重間에 수탉이 -0.02~0.02, 암탉은 -0.81~-0.19 그리고 體重과 飼料攝取量間은 수탉이 0.92, 암탉은 0.88~0.83으로 높은 正(+)의 關係를 보였고, 體重과 飼料要求率間에는 수탉 -0.08~0.2, 암탉은 0.04~0.09로 봄, 여름에 비해 높게 나타났다.
Data are presented concerning the effect of different seasons and sexes during the growing period on broiler performance.
Total 38, 451 broiler chickens were raised in spring, summer and winter and they were marketed at 6 or 7 weeks of age. Birds were alloted to 118 groups (240~360 birds per pen) and weighted at termination in order to determine variation in several economic traits between the sex groups.
The results obtained were summarized as follows :
1. The rate of livability of the females were higher than that of the males in all seasons (P<0.01).
2. Body weights of males were heavier than that of females by 17.4% at 6 wks, and 19.1% at 7 wks of age : and by 18.0~19.6%, 17.6~18.4%, and 19.6~19.3% in spring, summer, and winter, respectively (P<0.01).
3. Males consumed more feed than females by 13.3~13.8%. And same trends was noted by season ; 11.7~13.5% in spring, 17.3~15.0% in summer, and 11.5~13.0% in winter.
4. Feed requirement of the females was less than that of the males ; by 6.0~7.1%, 5.9~1.0%, and 5.4~5.5% in spring, summer, and winter, respectively (P<0.01).
5. The correlation coefficients between body weight and feed intake in spring were 0.81~0.87 in males, and 0.84~0.88 in females and those between body weight and feed requirements were -0.32~0.51 in males, and -0.17~-0.45 in females.
6. In summer the correlation coefficients between livability and body weight were -0.1~-0.37 in males, and -0.36~-0.51 in females, those between body weight and feed intake were 0.66~0.77 in males, and 0.5~0.82 in females, and those between body weight and feed requirement were -0.42~-0.22 in males, and -0.24~-0.001 in females.
7. In winter the correlation coefficients between livability and body weight were -0.02~0.02 in males, -0.18~-0.19 in females, those between body weight and feed requirements were -0.08~0.2 in males, and 0.04~0.09 in females.